Emerson 848T User Manual

Download

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T High Density Temperature Transmitter with FOUNDATION™ fieldbus

Device Revision 7

www.rosemount.com

Reference Manual

NOTICE

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Rosemount 848T High Density Temperature Transmitter with

OUNDATION fieldbus

Read this manual before working with the product. For personal and system safety, and for optimum product performance, make sure to thoroughly understand the contents before installing, using, or maintaining this product.

The United States has two toll-free assistance numbers and one international number.

Customer Central

1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)

National Response Center

1-800-654-7768 (24 hours a day) Equipment service needs

International

1-(952) 906-8888

The products described in this document are NOT designed for nuclear-qualified applications.

Using non-nuclear qualified products in applications that require nuclear-qualified hardware or products may cause inaccurate readings.

For information on Rosemount nuclear-qualified products, contact an Emerson Process Management Sales Representative.

www.rosemount.com

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

SECTION 1 Introduction

SECTION 2 Installation

Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Service Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Mounting to a DIN Rail Without an Enclosure . . . . . . . . . . . . . . . . 2-2

Mounting to a Panel with a Junction Box . . . . . . . . . . . . . . . . . . . . 2-2

Mounting to a 2-in. Pipe Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Surges/Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Using Cable Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

Using Conduit Entries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

SECTION 3 Configuration

Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Standard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Transmitter Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Custom Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Damping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Configure the Differential Sensors . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Configure Measurement Validation . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Common Configurations for High Density Applications. . . . . . . . . . . . 3-4

Interfacing Analog Transmitters to Foundation fieldbus . . . . . . . . . 3-6

Block Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

PlantWeb

Recommended Actions for PlantWeb Alerts . . . . . . . . . . . . . . . . 3-14

Transducer Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15

Transducer Block Sub-Parameter Tables . . . . . . . . . . . . . . . . . . 3-20

™

Alerts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

TOC-1

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

SECTION 4 Operation and Maintenance

APPENDIX A Reference Data

APPENDIX B Product Certificates

Safety Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Foundation fieldbus Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Commissioning (Addressing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Sensor Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Communication/Power Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Resetting the Configuration (RESTART) . . . . . . . . . . . . . . . . . . . . 4-3

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Foundation fieldbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Transducer Block Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Functional Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3

Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-4

Performance Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-4

Dimensional Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-8

Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-11

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-12

Hazardous Locations Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

North American Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1

European Approvals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4

Intrinsically Safe and Non-Incendive Installations. . . . . . . . . . . . . . .B-11

Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-12

APPENDIX C Foundation™ fieldbus Technology

APPENDIX D Function Blocks

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1

Device Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3

Block Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3

Instrument- Specific Function Blocks . . . . . . . . . . . . . . . . . . . . . . .C-3

Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3

Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4

Link Active Scheduler (LAS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4

Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Scheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6

Unscheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7

Function Block Scheduling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8

Analog Input (AI) Function Block. . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1

Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3

AI Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-8

Multiple Analog Input (MAI) Function Block. . . . . . . . . . . . . . . . . . . . .D-9

Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-10

MAI Block Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-14

Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-15

Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-17

ISEL Block Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-20

TOC-2

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Section 1 Introduction

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 1-2

Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

ensure the safety of the personnel performing the operations. Infor mation that potentially raises safety issues is indicated by a warning symbol ( ). Please refer to the following safety messages before performing an operation preceded by this symbol.

Warnings

Failure to follow these installation guidelines could result in death or serious injury.

• Make sure only qualified personnel perform the installation.

Process leaks could result in death or serious injury.

• Do not remove the thermowell while in operation. Removing while in operation may cause process fluid leaks.

• Install and tighten thermowells and sensors before applying pressure, or process leakage may result.

Electrical shock could cause death or serious injury.

• If the sensor is installed in a high voltage environment and a fault condition or installation error occurs, high voltage may be present on transmitter leads and terminals.

• Use extreme caution when making contact with the leads and terminals.

www.rosemount.com

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

October 2011

OVERVIEW Transmitter The Rosemount 848T is optimal for process temperature measurement

because of its ability to simultaneously measure eight separate and independent temperature points with one transmitter. Multiple temperature sensor types may be connected to each 848T transmitter. In addition, the 848T can accept 4-20 mA inputs. The enhanced measurement capability of the 848T allows it to communicate these variables to any F fieldbus host or configuration tool.

OUNDATION

Manual This manual is designed to assist in the installation, operation, and

maintenance of the Rosemount 848T Temperature Transmitter. Section 1: Introduction

• Overview

• Considerations

• Return of Materials

Section 2: Installation

• Mounting

• Installation

• Wiring

• Power Supply

• Commissioning

Section 3: Configuration

•F

OUNDATION fieldbus Technology

• Configuration

• Function Block Configuration

Section 4: Operation and Maintenance

• Hardware Maintenance

• Troubleshooting

Appendix A: Specification and Reference Data

• Specifications

• Dimensional Drawings

• Ordering Information

Appendix B: Product Certificates

• Hazardous Locations Certificates

• Intrinsically Safe and Non-Incendive Installations

• Installation Drawings

Appendix C: Foundation™ Fieldbus Technology

• Device Descriptions

• Block Operation

Appendix D: Function Blocks

• Analog Input (AI) Function Block

• Multiple Analog Input (MAI) Function Block

• Input Selector Function Block

1-2

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

SERVICE SUPPORT To expedite the return process in North America, call the Emerson Process

Management National Response Center toll-free at 800-654-7768. This center, available 24 hours a day, will assist with any needed information or materials.

The center will ask for the following information:

• Product model

• Serial numbers

• The last process material to which the product was exposed

The center will provide

• A Return Material Authorization (RMA) number

• Instructions and procedures that are necessary to return goods that were exposed to hazardous substances

For other locations, please contact an Emerson Process Management sales representative.

NOTE

If a hazardous substance is identified, a Material Safety Data Sheet (MSDS), required by law to be available to people exposed to specific hazardous substances, must be included with the returned materials.

1-3

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

1-4

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Section 2 Installation

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4

Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-8

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-10

Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-11

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 2-12

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

Warnings

Failure to follow these installation guidelines could result in death or serious injury.

• Make sure only qualified personnel perform the installation.

Process leaks could result in death or serious injury.

• Do not remove the thermowell while in operation. Removing while in operation may cause process fluid leaks.

• Install and tighten thermowells and sensors before applying pressure, or process leakage may result.

Electrical shock could cause death or serious injury.

• If the sensor is installed in a high voltage environment and a fault condition or installation error occurs, high voltage may be present on transmitter leads and terminals.

• Use extreme caution when making contact with the leads and terminals.

MOUNTING The 848T is always mounted remote from the sensor assembly. There are

three mounting configurations:

• To a DIN rail without an enclosure

• To a panel with an enclosure

• To a 2-in pipe stand with an enclosure using a pipe mounting kit

www.rosemount.com

Rosemount 848T

DIN Rail Mounting Clip

848T without installed enclosure

848T with aluminum or plastic box

Panel

Mounting Screws (4)

Cover Screws (4)

848T with a stainless steel box

Panel

Mounting Screws (2)

Reference Manual

00809-0100-4697, Rev EA

October 2011

Mounting to a DIN Rail Without an Enclosure

Figure 2-1. Mounting the 848T to a DIN Rail

Mounting to a Panel with a Junction Box

To mount the 848T to a DIN rail without an enclosure, follow these steps:

1. Pull up the DIN rail mounting clip located on the top back side of the transmitter.

2. Hinge the DIN rail into the slots on the bottom of the transmitter.

3. Tilt the 848T and place onto the DIN rail. Release the mounting clip. The transmitter should be securely fastened to the DIN rail.

DIN Rail

When inside of a plastic or aluminum junction box, the 848T mounts to a panel using four

/4-20 x 1.25-in. screws.

When inside of a stainless steel junction box, the 848T mounts to a panel using two

/4-20 x 1/2-in. screws.

Figure 2-2. Mounting the 848T junction box to a panel

Aluminum/Plastic Stainless Steel

2-2

Reference Manual

5.1

(130)

10.2

(260)

6.6 (167) fully

assembled

4.7

(119)

7.5 (190) fully

assembled

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Mounting to a 2-in. Pipe Stand

Use the optional mounting bracket (option code B6) to mount the 848T to a 2-in. pipe stand when using a junction box.

Aluminum/Plastic Junction Box

(styles JA and JP)

Front View Side View Front View Side View

Dimensions are in inches (millimeters)

Aluminum/Plastic Junction Box

Mountedona Vertical Pipe

Stainless Steel Junction Box

(style JS)

Stainless Steel Junction Box

Mounted on a Vertical Pipe

2-3

Reference Manual

Power

Supply

Terminators

Devices 1 through 16*

Integrated Power

Conditioner

and Filter

(Spur)

Signal Wiring

FOUNDATION

fieldbus Host or

configuration tool

6234 ft (1900 m) max

(depending upon cable

characteristics)

(Trunk)

123

2-wire

RTD and

Ohms

3-wire

RTD and

Ohms*

Thermocouples /

Ohms and

Millivolts

123 123

2-Wire RTD

with

Compensation

Loop**

123

Rosemount 848T

00809-0100-4697, Rev EA

October 2011

WIRING If the sensor is installed in a high-volt age environ ment and a fault conditio n or

installation error occurs, the sensor leads and transm itte r te rm in als co uld carry lethal voltages. Use extreme caution when making contact with the leads and terminals.

NOTE

Do not apply high voltage (e.g. AC line voltage) to the transmitter terminals. Abnormally high voltage can damage the unit (bus terminal s are rate d to 4 2.4 VDC).

Figure 2-3. 848T Transmitter Field Wiring

* Intrinsically safe installations may allow fewer devices per I.S. barrier

Connections The 848T transmitter is compatible with 2 or 3-wire RTD, thermocouple, Oh m,

and millivolt sensor types. Figure 2-4 shows the correct input connections to the sensor terminals on the transmitter . The 848T can also accept inputs from analog devices using the optional analog input connector. Figure 2-5 shows the correct input connections to the analog input connector when installed on the transmitter. Tighten the terminal screws to ensure proper connection.

Figure 2-4. Sensor Wiring Diagram

* Emerson Process Management provides 4-wire sensors for all single-element RTDs. Use these

RTDs in 3-wire configurations by clipping the fourth lead or leaving it disconnected and insulated with electrical tape.

** The transmitter must be configured for a 3-wire RTD in order to recognize an RTD with a

compensation loop.

2-4

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

RTD or Ohm Inputs

V ario us R TD configur ations, including 2-wire an d 3-wir e are used in industrial applications. If the transmitter is mounted remotely from a 3-wire RTD, it will operate within specifications, without recalibration, for lead wire resist ances of up to 60 ohms per lead (equivalent to 6,000 feet of 20 AWG wire). If using a 2-wire RTD, both RTD leads are in series with the sensor element, so errors can occur if the lead lengths exceed one foot of 20 AWG wire. Compensation for this error is provided when using 3-wire RTDs.

Thermocouple or Millivolt Inputs

Use appropriate thermocouple extension wire to connect the thermocouple to the transmitter. Make connections for millivolt inputs using copper wire. Use shielding for long runs of wire.

Analog Inputs

The analog connector converts the 4–20 mA signal to a 20–100 mV signal that can be read by the 848T and transmitted using F

Use the following steps when installing the 848T with the analog connector:

1. The 848T, when ordered with option code S002, comes with four analog connectors. Replace the standard connector with the analog connector on the desired channels.

2. Wire one or two analog transmitters to the analo g connector according to Figure 2-5. There is space available on the analog connector label for identification of the analog inputs.

OUNDATION fieldbus.

NOTE

Power supply should be rated to support the connected transmitter(s).

3. If the analog transmitters can communicate using HART protocol, the analog connectors are supplied with the ability to switch in a 250 ohm resistor for HART communication (see Figure 2-6).

One switch is supplied for each input (top switch for “A” inputs and bottom switch for “B” inputs). Setting the switch in the “ON” position (to the right) bypasses the 250 ohm resistor. Terminals are provided for each analog input to connect a Field Communicator for local configuration.

2-5

Rosemount 848T

Power Supply

Analog Input

Connectors

Analog Transmitters

HART

Channel A

250 ohm resistor in the loop when switched to the left

Space available for

identification of inputs

HART Channel B

Figure 2-5. 848T Analog Input Wiring Diagram

Reference Manual

00809-0100-4697, Rev EA

October 2011

Figure 2-6. 848T Analog Connector

2-6

Reference Manual

NOT USED SECURITY SIMULATE ENABLE

Connect Power Leads Here

Ground (required with T1 option)

00809-0100-4697, Rev EA October 2011

Power Supply Connections

The transmitter requires between 9 and 32 VDC to operate and provide complete functionality. The DC power supply should provide power with less than 2% ripple. A fieldbus segment requires a power conditioner to isolate the power supply filter and decouple the segment from other segments attached to the same power supply.

All power to the transmitter is supplied over the signal wiring. Signal wiring should be shielded, twisted pair for best results in electrically noisy environments. Do not use unshielded signal wiring in open trays with power wiring or near heavy electrical equipment.

Use ordinary copper wire of sufficient size to ensure that the voltage across the transmitter power terminals does not go below 9 VDC. The power terminals are polarity insensitive. To power the transmitter:

1. Connect the power leads to the terminals marked “Bus,” as shown in Figure 2-7.

2. Tighten the terminal screws to ensure adequate contact. No additional power wiring is necessary.

Rosemount 848T

Figure 2-7. Transmitter Label

Surges/Transients The transmitter will withstand electrical transients encountered through static

discharges or induced switching transients. However, a transient protection option (option code T1) is available to protect the 848T against high-energy transients. The device must be properly grounded using the ground terminal (see Figure 2-7).

2-7

Reference Manual

Sensor Wires

Power Supply

Shield ground point

848T

Sensor Wires

Power Supply

Shield ground points

848T

Rosemount 848T

00809-0100-4697, Rev EA

October 2011

GROUNDING The 848T transmitter provides input/output isolation up to 620 V rms.

NOTE

Neither conductor of the fieldbus segment can be grounded. Grounding out one of the signal wires will shut down the entire fieldbus segment.

Shielded Wire

Each process installation has different requirements for grounding. Use the grounding options recommended by the facility for the specific sensor type or begin with grounding option 1 (most common).

Ungrounded Thermocouple, mV, and RTD/Ohm Inputs

Option 1:

1. Connect signal wiring shield to the sensor wiring shield(s).

2. Ensure the shields are tied together and electrically isolated from the transmitter enclosure.

3. Only ground shield at the power supply end.

4. Ensure that the sensor shield(s) is electrically isolated from the surrounding grounded fixtures.

2-8

Option 2:

1. Connect sensor wiring shield(s) to the transmitter enclosure (only if the enclosure is grounded).

2. Ensure the sensor shield(s) is electrically isolated from surrounding fixtures that may be grounded.

3. Ground signal wiring shield at the power supply end.

Reference Manual

Sensor Wires

Power Supply

Shield ground points

848T

Power Supply

Shield ground points

848T

Analog Device

Power Supply

4-20 mA loop

FOUNDATION fieldbus bus

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Grounded Thermocouple Inputs

1. Ground sensor wiring shield(s) at the sensor.

2. Ensure that the sensor wiring and signal wiring shields are electrically isolated from the transmitter enclosure.

3. Do not connect the signal wiring shield to the sensor wiring shield(s).

4. Ground signal wiring shield at the power supply end.

Analog Device Inputs

1. Ground analog signal wire at the power supply of the a nalog devices.

2. Ensure that the analog signal wire and the fieldbus signal wire shie lds are electrically isolated from the transmitter enclosure.

3. Do not connect the analog signal wire shield to the fieldbus signal wire shield.

4. Ground fieldbus signal wire shield at the power supply end.

Transmitter Enclosure (optional)

Ground the transmitter in accordance with loca l elec tr ical re qu ir em e nts.

2-9

Rosemount 848T

NOT USED SECURITY SIMULATE ENABLE

SWITCHES

Figure 2-8. Switch Location on the Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Security

After configuring the transmitter, the data can be protected from unwarranted changes. Each 848T is equipped with a security switch that can be positioned “ON” to prevent the accidental or deliberate change of configuration data. This switch is located on the front side of the electronics module and is labeled SECURITY.

See Figure 2-8 for switch location on the transmitter label.

Simulate Enable

The switch labeled SIMULATE ENABLE is used in conjunction with the Analog Input (AI) and Multiple Analog Input (MAI) function blocks. This switch is used to simulate temperature measurement.

Not Used

The switch is not functional.

2-10

Reference Manual

Device ID

Device Tag

to denote

physical

location

00809-0100-4697, Rev EA October 2011

TAGGING Commissioning Tag

The 848T has been supplied with a removable commissioning tag that contains both the Device ID (the unique code that identifies a p articular device in the absence of a device tag) and a space to record the device tag (the operational identification for the device as defined by the Piping and Instrumentation Diagram (P&ID)).

When commissioning more than one device on a fieldbus segment, it can be difficult to identify which device is at a particular location. The removable tag, provided with the transmitter, can aid in this process by linking the Device ID to its physical location. The installer should note the physical location of the transmitter on both the upper and lower location of the commissioning tag. The bottom portion should be torn off for each device on the segment and used for commissioning the segment in the control system.

Figure 2-9. Commissioning Tag

Rosemount 848T

Transmitter Tag

Hardware

• Tagged in accordance with customer requirements

• Permanently attached to the transmitter

Software

• The transmitter can store up to 32 characters

• If no characters are specified, the first 30 characters of the hardware tag will be used

Sensor Tag

Hardware

• A plastic tag is provided to record identification of eight sensors

• This information can be printed at the factory upon request

• In the field, the tag can be removed, printed onto, and reattached to the transmitter

Software

• If sensor tagging is requested, the Transducer Block SERIAL_NUMBER parameters will be set at the factory

• The SERIAL_NUMBER parameters can be updated in the field

2-11

Reference Manual

Cable Gland

Sensor 1

Sensor 3

Sensor 5

Sensor 7

Power/Signal

Sensor 2

Sensor 4

Sensor 6

Sensor 8

Enclosure Cover Screw (4)

Enclosure

Cover Screw

Sensors

1 and 2

Conduit

Sensor 3 and 4 Conduit

Sensor 5 and 6

Conduit

Power/Signal Conduit

Sensor 7 and 8 Conduit

00809-0100-4697, Rev EA

Rosemount 848T

INSTALLATION Using Cable Glands Use the following steps to install the 848T with Cable Glands:

1. Remove the junction box cover by unscrewing the four cover screws.

2. Run the sensor and power/signal wires through the appropriate cable

glands using the pre-installed cable glands (see Figure 2-10).

3. Install the sensor wires into the correct screw terminals (follow the

label on the electronics module).

4. Install the power/signal wires onto the correct screw terminals. Power

is polarity insensitive, allowing the user to connect positive (+) or negative (–) to either Fieldbus wiring terminal labeled “Bus.”

5. Replace the enclosure cover and securely tighten all cover screws.

Figure 2-10. Installing the 848T with Cable Glands

October 2011

Using Conduit Entries Use the following steps to install the 848T with Conduit Entries:

1. Remove the junction box cover by unscrewing the four cover screws.

2. Remove the five conduit plugs and install five conduit fittings

(supplied by the installer).

3. Run pairs of sensor wires through each conduit fitting.

4. Install the sensor wires into the correct screw terminals (follow the

label on the electronics module).

5. Install the power/signal wires into the correct screw terminals. Power

is polarity insensitive, allowing the user to connect positive (+) or negative (–) to either Fieldbus wiring terminal labeled “Bus.”

6. Replace the junction box cover and securely tighten all cover screws.

Figure 2-11. Installing the 848T with Conduit Entries

2-12

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Section 3 Configuration

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-2

Common Configurations for High Density Applications page 3-4

Block Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 3-7

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

Warnings

Failure to follow these installation guidelines could result in death or serious injury.

• Make sure only qualified personnel perform the installation.

Process leaks could result in death or serious injury.

• Do not remove the thermowell while in operation. Removing while in operation may cause process fluid leaks.

• Install and tighten thermowells and sensors before applying pressure, or process leakage may result.

Electrical shock could cause death or serious injury.

• If the sensor is installed in a high voltage environment and a fault condition or installation error occurs, high voltage may be present on transmitter leads and terminals.

• Use extreme caution when making contact with the leads and terminals.

www.rosemount.com

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

October 2011

CONFIGURATION Standard Each FOUNDATION fieldbus configuration tool or host system has a different

way of displaying and performing configurations. Some will use Device Descriptions (DDs) and DD Methods to make configuration and displaying of data consistent across host platforms.

Unless otherwise specified, the 848T will be shipped with the following configuration (default):

Table 3-1. Standard Configuration Settings

Transmitter Configuration

Sensor Type Damping Measurement Units Output Line Voltage Filter Temperature Specific Blocks

FOUNDATION fieldbus Function Blocks

(1) For all eight sensors

(1)

Type J Thermocouple 5 seconds °C Linear with Temperature 60 Hz

• Transducer Block (1)

• Analog Input (8)

• Multiple Analog Input (2)

• Input Selector (4)

Refer to that systems documentation to perform configuration changes using a F

OUNDATION fieldbus host or configuration tool.

NOTE

To make configuration changes, ensure that the block is Out of Service (OOS) by setting the MODE_BLK.TARGET to OOS, or set the SENSOR_MODE to Configuration.

The transmitter is available with the standard configuration setting. The configuration settings and block configuration may be changed in the field with the Emerson Process Management Systems DeltaV other F

OUNDATION fieldbus host or configuration tool.

, with AMSinside, or

Custom Configuration Custom configurations are to be specified when ordering. Methods For FOUNDATION fieldbus hosts or configuration tools that support device

description (DD) methods, there are two configuration methods available in the Transducer block. These methods are included with the DD software.

• Sensor Configuration

• Sensor Input Trim (user input trim)

See the host system documentation for information on running DD methods from the host system. If the F does not support DD methods, refer to “Block Configuration” on p age 3-7 for information on how to modify sensor configuration parameters.

3-2

OUNDATION fieldbus host or configuration tool

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Alarms Use the following steps to configure the alarms, which are located in the

Resource Function Block.

1. Set the resource block to OOS.

2. Set WRITE_PRI to the appropriate alarm level (WRITE_PRI has a selectable range of priorities from 0 to 15, see “Alarm Priority Levels” on page 3-11. Set the other block alarm parameters at this time.

3. Set CONFIRM_TIME to the time, in device will wait for confirmation of receiving a report before trying again (the device does not retry if CONFIRM_TIME is 0).

4. Set LIM_NOTIFY to a value between zero and MAX_NOTIFY. LIM_NOTIFY is the maximum number of alert reports allowed before the operator needs to acknowledge an alarm condition.

5. Enable the reports bit in FEATURES_SEL. (When Multi-bit alerts is enabled, every active alarm is visible for any of the eight sensors, generated by a PlantWeb alert. This is different than only viewing the highest priority alarm.)

6. Set the resource block to AUTO.

For modifying alarms on individual function blocks (AI or ISEL blocks), refer to Appendix D: Function Blocks.

/32 of a millisecond, that the

Damping Use the following steps to configure the damping, which is located in the

Transducer Function Block.

1. Set Sensor Mode to Out of Service.

2. Change DAMPING to the desired filter rate (0.0 to 32.0 seconds).

3. Set Sensor Mode to In Service.

Configure the Differential Sensors

Configure Measurement Validation

Use the following steps to configure the Differential Sensors:

1. Set Dual Sensor Mode to Out of Service.

2. Set Input A and Input B to the sensor values that are to be used in the differential equation dif f = A– B. (NOTE: Unit type s must be the same.)

3. Set the DUAL_SENSOR_CALC to either Not Used, Absolute, or INPUT A minus INPUT B.

4. Set Dual Sensor Mode to In Service.

Use the following steps to configure Measurement Validation:

1. Set mode to Disabled for specific sensor.

2. Select sample rate. 1-10 sec/sample is available. 1 second/sample is preferred for sensor degradation. The higher the number of seconds between samples, the more emphasis put on process variation.

3. Select Deviation Limit from 0 to 10 units. If deviation limit is exceeded, a status event will be triggered.

4. Select Increasing Limit. Sets the limit for in creasing rate of change. If limit is exceeded, a status event will be triggered.

5. Select Decreasing Limit. Sets the limit for decreasing rate of change. If limit is exceeded, a status event will be triggered.

NOTE:

The decreasing limit selected is required to be a negative value.

3-3

Rosemount 848T

MAI Function Block

Out_1 Out_2 Out_3

Out_4 Out_5 Out_6 Out_7

Out_8

Reference Manual

00809-0100-4697, Rev EA

October 2011

6. Set the Deadband from 0 to 90%. This threshold is used to clear the PV status.

7. Set Status Prior ity. This determines what happens when the specific limit has been exceeded. No Alert - Ignores limit settings. Advisory Sets Advisory Plant Web Alert, but does not do anything with PV status. Warning - Set s a Maintenance Plant Web Alert and sets PV status to uncertain. Failure - Sets A Failure Plant Web Alert and sets PV status to Bad.

8. Set mode to Enabled for specific sensor.

COMMON CONFIGURATIONS FOR HIGH DENSITY APPLICATIONS

For the application to work properly, configure the links between the function blocks and schedule the order of their execution. The Graphical User Interface (GUI) provided by the F

OUNDATION fieldbus host or configuration tool

will allow easy configuration. The measurement strategies shown in this section represent some of the

common types of configurations available in the 848T. Although the appearance of the GUI screens will vary from host to host, the configuration logic is the same.

NOTE

Please ensure that the host system or configuration tool is properly configured before downloading the transmitter configuration. If config ured improperly, the F

OUNDATION fieldbus host or configuration tool could overwrite the default

transmitter configuration.

Typical Profiling Application

Example: Distillation column temperature profile where all channels have the same sensor units (°C, °F, etc.).

1. Place the Multiple Analog Input (MAI) function block in OOS mode (set MODE_BLK.TARGET to OOS).

2. Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X parameters remain writable, CHANNEL_X can only be set = X when CHANNEL=1.

3. Set L_TYPE to direct or indirect.

4. Set XD_SCALE (transducer measurement scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

5. Set OUT_SCALE (MAI output scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

6. Place the MAI Function Block in auto mode.

7. Verify that the function blocks are scheduled.

3-4

Reference Manual

MAI Function Block

Out_1 Out_2 Out_3

Out_4 Out_5 Out_6 Out_7

Out_8

ISEL

Function

Block

IN_1 IN_2 IN_3

IN_4 IN_5 IN_6 IN_7

IN_8

Out

Out_D

AI Function Block 1

Out

AI Function Block 8

Out

Out_D

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Monitoring Application with a Single Selection

Example: Average exhaust temperature of gas and turbine where there is a single alarm level for all inputs.

1. Link the MAI outputs to the ISEL inputs.

2. Place the Multiple Analog Input (MAI) function block in OOS mode (set MODE_BLK.TARGET to OOS).

3. Set CHANNEL= “channels 1 to 8.” Although the CHANNEL_X parameters remain writable, CHANNEL_X can only be set = X when CHANNEL=1.

4. Set L_TYPE to direct or indirect.

5. Set XD_SCALE (transducer measurement scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

6. Set OUT_SCALE (MAI output scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

7. Place the MAI function block in auto mode.

8. Place the Input Selector (ISEL) function block in OOS mode by setting MODE_BLK.TARGET to OOS.

9. Set OUT_RANGE to match the OUT_SCALE in the MAI block.

10. Set SELECT_TYPE to the desired function (Maximum Value, Minimum Value, First Good Value, Midpoint Value, or Average Value).

11. Set the alarm limits and parameters if necessary.

12. Place the ISEL function block in auto mode.

13. Verify that the function blocks are scheduled.

Measuring Temperature Points Individually

Example: Miscellaneous monitoring of temperature in a “close proximity” where each channel can have different senso r inp uts with differ en t un its and there are independent alarm levels for each input.

1. Place the first Analog Input (AI) function block in OOS mode (set MODE_BLK.TARGET to OOS).

2. Set CHANNEL to the appropriate channe l valu e. Refer to “Ala rm Priority Levels” on page 3-11 for a listing of channel definitions.

3. Set L_TYPE to direct.

4. Set XD_SCALE (transducer measurement scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

5. Set OUT_SCALE (AI output scaling) to the appropriate upper and lower range values, the appropriate sensor units, and display decimal point.

6. Set the alarm limits and parameters if necessary.

7. Place the AI function block in auto mode.

8. Repeat steps 1 through 7 for each AI function block.

9. Verify that the function blocks are scheduled.

3-5

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Interfacing Analog Transmitter s to FOUNDATION fieldbus

Transducer Block Configuration

Use the sensor configuration method to set the sensor type to mV – 2-wire for the applicable transducer block or follow these steps.

1. Set the MODE_BLK.TARGET to OOS mode, or set the SENSOR_MODE to configuration.

2. Set the SENSOR to mV.

3. Set the MODE_BLK.TARGET to AUTO, or set the SENSOR_MODE to operation.

Multiple Analog Input or Analog Input Block Configuration

Follow these steps to configure the applicable block.

1. Set the MODE_BLK.TARGET to OOS mode, or set the SENSOR_MODE to configuration.

2. Set CHANNEL to the transducer block configured for the analog input.

3. Set XD_SCALE.EU_0 to 20 Set XD_SCALE.EU_100 to 100 Set XD_SCALE.ENGUNITS to mV

4. SET OUT_SCALE to match the desired scale and units for the connected analog transmitter. Flow Example: 0 – 200 gpm

OUT_SCALE.EU_0 = 0 OUT_SCALE.EU_100 = 200 OUT_SCALE.ENGUNITS = gpm

5. Set L_TYPE to INDIRECT.

6. Set the MODE_BLK.TARGET to AUTO, or set the SENSOR_MODE to operation.

3-6

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

BLOCK CONFIGURATION

Resource Block The resource block defines the physical resources of the device including

type of measurement, memory, etc. The resource block also defines functionality , such as shed times, that is common across multiple blocks. The block has no linkable inputs or outputs and it performs memory-level diagnostics.

Table 3-2. Resource Block Parameters

Number Parameter Description

01 ST_REV The revision level of the static data associated with the function block. 02 TAG_DESC The user description of the intended application of the block. 03 STRATEGY The strategy field can be used to identify grouping of blocks. 04 ALERT_KEY The identification number of the plant unit. 05 MODE_BLK The actual, target, permitted, and normal modes of the block. For further description, see the

Mode parameter formal model in FF-890.

06 BLOCK_ERR This parameter reflects the error status associated with the hardware or software components

associated with a block. Multiple errors may be shown. For a list of enumeration values, see FF-890, Block_Err formal model.

07 RS_STATE State of the function block application state machine. For a list of enumeration values, see

FF-890. 08 TEST_RW Read/write test parameter - used only for conformance testing. 09 DD_RESOURCE String identifying the tag of the resource which contains the Device Description for the

resource. 10 MANUFAC_ID Manufacturer identification number - used by an interface device to locate the DD file for the

11 DEV_TYPE Manufacturer's model number associated with the resource - used by interface devices to

12 DEV_REV Manufacturer revision number associated with the resource - used by an interface device to

13 DD_REV Revision of the DD associated with the resource - used by the interface device to locate the

14 GRANT_DENY Options for controlling access of host computer and local control panels to operating, tuning

15 HARD_TYPES The types of hardware available as channel numbers. The supported hardware type is:

16 RESTART Allows a manual restart to be initiated. 17 FEATURES Used to show supported resource block options. The supported features are: Unicode,

18 FEATURE_SEL Used to select resource block options. 19 CYCLE_TYPE Identifies the block execution methods available for this resource. The supported cycle types

20 CYCLE_SEL Used to select the block execution method for this resource. 21 MIN_CYCLE_T Time duration of the shortest cycle interval of which the resource is capable. 22 MEMORY_SIZE Available configuration memory in the empty resource. To be checked before attempting a

23 NV_CYCLE_T Minimum time interval specified by the manufacturer for writing copies of NV parameters to

24 FREE_SPACE Percent of memory available for further configuration. Zero in preconfigured resource. 25 FREE_TIME Percent of the block processing time that is free to process add itional blocks. 26 SHED_RCAS Time duration at which to give up on computer writes to function block RCas locations. Shed

27 SHED_ROUT Time duration at which to give up on computer writes to function block ROut locations. Shed

resource.

locate the DD file for the resource.

DD file for the resource.

and alarm parameters of the block.

SCALAR_INPUT

Reports, Soft_Write_Lock, Hard_Write_Lock, and Multi-Bit Alarms.

are: SCHEDULED, and COMPLETION_OF_BLOCK_EXECUTION

download.

non-volatile memory. Zero means it will never be automatically copied. At the end of

NV_CYCLE_T, only those parameters which have changed need to be updated in NVRAM.

from RCas will never happen when SHED_RCAS = 0.

from ROut will never happen when SHED_ROUT = 0.

3-7

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Table 3-2. Resource Block Parameters

Number Parameter Description

28 FAULT_STATE Condition set by loss of communication to an output block, fault promoted to an output block

or physical contact. When FAIL_SAFE condition is set, then output function blocks will

perform their FAIL_SAFE actions. 29 SET_FSTATE Allows the FAIL_SAFE condition to be manually initiated by selecting Set. 30 CLR_FSTATE Writing a Clear to this parameter will clear the device FAIL_SAFE if the field condition has

31 MAX_NOTIFY Maximum number of unconfirmed notify messages possible. 32 LIM_NOTIFY Maximum number of unconfirmed alert notify messages allowed. 33 CONFIRM_TIME The time the resource will wait for confirmation of receipt of a report before trying again. Retry

34 WRITE_LOCK If set, all writes to static and non-volatile parameters are prohibited, except to clear

35 UPDATE_EVT This alert is generated by any change to the static data. 36 BLOCK_ALM The BLOCK_ALM is used for all configuration, hardware, connection failure or system

37 ALARM_SUM The current alert status, unacknow ledged states, unreported states, and disabled states of

38 ACK_OPTION Selection of whether alarms associated with the block will be automatically acknowledged. 39 WRITE_PRI Priority of the alarm generated by clearing the write lock. 40 WRITE_ALM This alert is generated if the write lock parameter is cleared. 41 ITK_VER Major revision number of the interoperability test case used in certifying this device as

42 DISTRIBUTOR Reserved for use as distributor ID. No FOUNDATION enumerations defined at this time. 43 DEV_STRING This is used to load new licensing into the device. The value can be written but will always

44 XD_OPTIONS Indicates which transducer block licensing options are enabled. 45 FB_OPTIONS Indicates which function block licensing options are enabled. 46 DIAG_OPTIONS Indicates which diagnostics licensing options are enabled. 47 MISC_OPTIONS Indicates which miscellaneous licensing options are enabled. 48 RB_SFTWR_REV_MAJOR Major revision of software that the resource block was created with. 49 RB_SFTWR_REV_MINOR Minor revision of software that the resource block was created with. 50 RB_SFTWR_REV_BUILD Build of software that the resource block was created with. 51 RB_SFTWR_REV_ALL The string will contains the following fields:

52 HARDWARE_REV Hardware revision of that hardware that has the resource block in it. 53 OUTPUT_BOARD_SN Output board serial number. 54 FINAL_ASSY_NUM The same final assembly number placed on the label. 55 DETAILED_STATUS Indicates the state of the transmitter. NOTE: Will be writable when PWA_SIMULATE is On

56 SUMMARY_STATUS An enumerated value of repair analysis. 57 MESSAGE_DATE Date associated with the MESSAGE_TEXT parameter 58 MESSAGE_TEXT Used to indicate changes made by the user to the device’s installation, configuration, or

59 SELF_TEST Used to self test the device. Tests are device specific.

cleared.

will not happen when CONFIRM_TIME=0.

WRITE_LOCK. Block inputs will continue to be updated.

problems in the block. The cause of the alert is entered in the subcode field. The first alert to

become active will set the Active status in the Status attribute. As soon as the Unreported

status is cleared by the alert reporting task, another block alert may be reported without

clearing the Active status, if the subcode has changed.

the alarms associated with the function block.

interoperable. The format and range are controlled by the Fieldbus F

read back with a value of 0.

Major rev: 1-3 characters, decimal number 0-255

Minor rev: 1-3 characters, decimal number 0-255

Build rev: 1-5 characters, decimal number 0-255

Time of build: 8 characters, xx:xx:xx, military time

Day of week of build: 3 characters, Sun, Mon, …

Month of build: 3 characters, Jan, Feb.

Day of month of build: 1-2 characters, decimal number 1-31

Year of build: 4 characters, decimal

Builder: 7 characters, login name of builder

during simulation mode.

calibration.

OUNDATION.

October 2011

3-8

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-2. Resource Block Parameters

Number Parameter Description

60 DEFINE_WRITE_LOCK Allows the operator to select how WRITE_LOCK behaves. The initial value is “lock

everything”. If the value is set to “lock only physical device” then the resource and transducer

blocks of the device will be locked but changes to function blocks will be allowed. 61 SAVE_CONFIG_NOW Allows the user to optionally save all non-volatile information immediately. 62 SAVE_CONFIG_BLOCKS Number of EEPROM blocks that have been modified since last burn. This value will count

down to zero when the configuration is saved. 63 START_WITH_DEFAULTS 0 = Uninitialized

1 = do not power-up with NV defaults

2 = power-up with default node address

3 = power-up with default pd_tag and node address

4 = power-up with default data for the entire communications stack (no application data) 64 SIMULATE_IO Status of Simulate jumper/switch 65 SECURITY_IO Status of Security jumper/switch 66 SIMULATE_STATE The state of the simulate jumper

0 = Uninitialized

1 = Jumper/switch off, simulation not allowed

2 = Jumper/switch on, simulation not allowed (need to cycle jumper/switch)

3 = Jumper/switch on, simulation allowed 67 DOWNLOAD_MODE Gives access to the boot block code for over the wire downloads

0 = Uninitialized

1 = Run Mode

2 = Download Mode 68 RECOMMENDED_ACTION Enumerated list of recommended actions displayed with a device alert. 69 FAILED_PRI Designates the alarming priority of the FAILED_ALM. 70 FAILED_ENABLE Enabled FAILED_ALM alarm conditions. Corresponds bit for bit to the FAILED_ACTIVE. A bit

on means that the corresponding alarm condition is enabled and will be detected. A bit off

means the corresponding alarm condition is disabled and will not be detected. 71 FAILED_MASK Mask of FAILED_ALM. Corresponds bit for bit to FAILED_ACTIVE. A bit on means that the

condition is masked out from alarming. 72 FAILED_ACTIVE Enumerated list of failure conditions within a device. 73 FAILED_ALM Alarm indicating a failure within a device which makes the device non-operational. 74 MAINT_PRI Designates the alarming priority of the MAINT_ALM 75 MAINT_ENABLE Enabled MAINT_ALM alarm conditions. Corresponds bit for bit to the MAINT_ACTIVE. A bit

on means that the corresponding alarm condition is enabled and will be detected. A bit off

means the corresponding alarm condition is disabled and will not be detected. 76 MAINT_MASK Mask of MAINT_ALM. Corresponds bit for bit to MAINT_ACTIVE. A bit on means that the

condition is masked out from alarming. 77 MAINT_ACTIVE Enumerated list of maintenance conditions within a device. 78 MAINT_ALM Alarm indicating the device needs maintenance soon. If the condition is ignored, the device

will eventually fail. 79 ADVISE_PRI Designates the alarming priority of the ADVISE_ALM 80 ADVISE_ENABLE Enabled ADVISE_ALM alarm conditions. Corresponds bit for bit to the ADVISE_ACTIVE. A

bit on means that the corresponding alarm condition is enabled and will be detected. A bit off

means the corresponding alarm condition is disabled and will not be detected. 81 ADVISE_MASK Mask of ADVISE_ALM. Corresponds bit for bit to ADVISE_ACTIVE. A bit on means that the

condition is masked out from alarming. 82 ADVISE_ACTIVE Enumerated list of advisory conditions within a device.

Rosemount 848T

3-9

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Table 3-2. Resource Block Parameters

Number Parameter Description

83 ADVISE_ALM Alarm indicating advisory alarms. These conditions do not have a direct impact on the

process or device integrity. 84 HEALTH_INDEX Parameter representing the overall health of the device, 100 being perfect and 1 being

non-functioning. The value will be set based on the active PWA alarms in accordance with the

requirements stated in “Device Alerts and Health Index PlantWeb Implementation Rules”.

Each device may implement its own unique mapping between the PWA parameters and

HEALTH_INDEX although a default mapping will be available based on the following rules.

HEALTH_INDEX will be set based on the highest priority PWA *_ACTIVE bit as follows:

FAILED_ACTIVE: 0 to 31 - HEALTH_INDEX = 10

MAINT_ACTIVE: 29 to 31 - HEALTH_INDEX = 20

MAINT_ACTIVE: 26 to 28 - HEALTH_INDEX = 30

MAINT_ACTIVE: 19 to 25 - HEALTH_INDEX = 40

MAINT_ACTIVE: 10 to 16 - HEALTH_INDEX = 50

MAINT_ACTIVE: 5 to 9 - HEALTH_INDEX = 60

MAINT_ACTIVE: 0 to 4 - HEALTH_INDEX = 70

ADVISE_ACTIVE: 16 to 31 - HEALTH_INDEX = 80

ADVISE_ACTIVE: 0 to 15 - HEALTH_INDEX = 90

NONE - HEALTH_INDEX = 100 85 PWA_SIMULATE Allows direct writes to the PlantWeb Alert "ACTIVE" parameters and

RB.DETAILED_STATUS. The simulate jumper must be "ON' and the SIMULATE_STATE

must be "Jumper on, simulation allowed" before PWA_SIMULATE can be active.

October 2011

Table 3-3. BLOCK_ERR Conditions

Block Errors

Table 3-3 lists conditions reported in the BLOCK_ERR parameter.

Number Name and Description

0 Other 1 Block Configuration Error: A feature in CYCLE_SEL is set that is not supported by

CYCLE_TYPE.

3 Simulate Active: This indicates that the simulation jumper is in place. This is not an

indication that the I/O blocks are using simulated data. 7 Input failure/process variable has bad status 9 Memory Failure: A memory failure has occurred in FLASH, RAM, or EEPROM

memory. 10 Lost Static Data: Static data that is stored in non-volatile memory

has been lost. 11 Lost NV Data: Non-volatile data that is stored in non-volatile memory

has been lost. 13 Device Needs Maintenance Now 14 Power Up: The device was just powered-up. 15 OOS: The actual mode is out of service.

Modes

The resource block supports two modes of operation as defined by the MODE_BLK parameter:

3-10

Automatic (Auto)

The block is processing its normal background memory checks.

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-4. Alarm Priority Levels

Rosemount 848T

Out of Service (OOS)

The block is not processing its tasks. When the resource block is in OOS, all blocks within the resource (device) are forced into OOS. The BLOCK_ERR parameter shows Out of Service. In this mode, changes can be made to all configurable parameters. The tar get mode of a block may be restricted to one or more of the supported modes.

Alarm Detection

A block alarm will be generated whenever the BLOCK_ERR has an error bit set. The types of block error for the resource block are defined above . A write alarm is generated whenever the WRITE_LOCK parameter is cleared. The priority of the write alarm is set in the following parameter:

•WRITE_PRI

Number Description

0 The priority of an alarm condition changes to 0 after the condition that caused the

alarm is corrected.

1 An alarm condition with a priority of 1 is recognized by the system, but is not

reported to the operator.

2 An alarm condition with a priority of 2 is reported to the operator, but does not

require operator attention (such as diagnostics and system alerts).

3-7 Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.

8-15 Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.

Status Handling

There are no status parameters associated with the resource block.

PlantWeb™ Alerts The alerts and recommended actions should be used in conjunction with

“Operation and Maintenance” on page 4-1. The Resource Block will act as a coordinator for PlantWeb alerts. There will

be three alarm parameters (FAILED_ALARM, MAINT_ALARM, and ADVISE_ALARM) which will contain information regarding some of the device errors which are detected by the transmitter software. There will be a RECOMMENDED_ACTION parameter which will be used to display the recommended action text for the highest priority alarm and a HEAL TH_INDEX parameters (0 - 100) indicating the overall health of the transmitter. FAILED_ALARM will have the highest priority followed by MAINT_ALARM and ADVISE_ALARM will be the lowest priority.

FAILED_ALARMS

A failure alarm indicates a failure within a device that will make the device or some part of the device non-operational. This implies that the device is in need of repair and must be fixed immediately. There are five parameters associated with FAILED_ALARMS specifically, they are described below.

FAILED_ENABLED

This parameter contains a list of failures in the device which makes the device non-operational that will cause an alert to be sent. Below is a list of the failures with the highest priority first.

3-11

Rosemount 848T

Table 3-5. Failure Alarms

Reference Manual

00809-0100-4697, Rev EA

October 2011

Alarm Priority

Electronics Failure 1 Memory Failure 2 Hardware/Software Incompatible 3 Body Temperature Failure 4 Sensor 8 Failure 5 Sensor 7 Failure 6 Sensor 6 Failure 7 Sensor 5 Failure 7 Sensor 4 Failure 9 Sensor 3 Failure 10 Sensor 2 Failure 11 Sensor 1 Failure 12

FAILED_MASK

This parameter will mask any of the failed conditions listed in FAILED_ENABLED. A bit on means that the condition is masked out from alarming and will not be reported.

FAILED_PRI

Designates the alerting priority of the FAILED_ALM, see Table 3-4 on page 3-11. The default is 0 and the recommended value are between 8 and 15.

FAILED_ACTIVE

This parameter displays which of the alarms is active. Only the alarm with the highest priority will be displayed. This priority is not the same as the FAILED_PRI p arameter described above. This priority is hard coded within the device and is not user configurable.

FAILED_ALM

Alarm indicating a failure within a device which makes the device non-operational.

MAINT_ALARMS

A maintenance alarm indicates the device or some part of the device needs maintenance soon. If the condition is ignored, the device will eventually fail. There are five parameters associated with MAINT_ALARMS, they are described below.

MAINT_ENABLED

The MAINT_ENABLED parameter contains a list of conditions indicating the device or some part of the device needs maintenance soon.

3-12

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-6. Maintenance Alarms/Priority Alarm

Rosemount 848T

Alarm Priority

Sensor 8 Degraded 1 Sensor 7 Degraded 2 Sensor 6 Degraded 3 Sensor 5 Degraded 4 Sensor 4 Degraded 5 Sensor 3 Degraded 6 Sensor 2 Degraded 7 Sensor 1 Degraded 8 Body Temperature Out of Range 9 CJC Degraded 10

MAINT_MASK

The MAINT_MASK parameter will mask any of the failed conditions listed in MAINT_ENABLED. A bit on means that the condition is masked out from alarming and will not be reported.

MAINT_PRI

MAINT_PRI designates th e alarming priority of the MAINT_ALM, T able 3-4 on page 3-11. The default is 0 and the recommended values is 3 to 7.

MAINT_ACTIVE

The MAINT_ACTIVE parameter displays which of the alarms is active. Only the condition with the highest priority will be displayed. This priority is not the same as the MAINT_PRI parameter described above. This priority is hard coded within the device and is not user configurable.

MAINT_ALM

An alarm indicating the device needs maintenance soon. If the co ndition is ignored, the device will eventually fail.

Advisory Alarms

An advisory alarm indicates informative conditions that do not have a direct impact on the device's primary functions. There are five parameters associated with ADVISE_ALARMS, they are described below.

ADVISE_ENABLED

The ADVISE_ENABLED parameter contains a list of informative conditions that do not have a direct impact on the device's primary functions. Below is a list of the advisories with the highest priority first.

Alarm Priority

PWA Simulate Active 1 Excessive Deviation 2 Excessive Rate of Change 3

NOTE

Alarms are only prioritized if Multi-Bit Alerts are disabled. If MBA is enabled, all alerts are visible.

3-13

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

ADVISE_MASK

The ADVISE_MASK parameter wi ll mask any of the failed conditions listed in ADVISE_ENABLED. A bit on means the condition is masked out from alarming and will not be reported.

ADVISE_PRI

ADVISE_PRI designates the alarming priority of the ADVISE_ALM, see Table 3-4 on page 3-11. The defau lt is 0 and the r ecommended values are 1 or 2.

ADVISE_ACTIVE

The ADVISE_ACTIVE parameter displays which of the advisories is active. Only the advisory with the highest priority will be displayed. This priority is not the same as the ADVISE_PRI parameter described above. This priority is hard coded within the device and is not user configurable.

ADVISE_ALM

ADVISE_ALM is an alarm indicating advisory alarms. These conditions do not have a direct impact on the process or device integrity.

Recommended Actions for PlantWeb Alerts

Table 3-7. RB.RECOMMENDED_ACTION

RECOMMENDED_ACTION

The RECOMMENDED_ACTION parameter displays a text string that will give a recommended course of action to take based on which type and which specific event of the PlantWeb alerts are active.

Alarm Type Active Event Recommended Action

None None No action is required. Advisory PWA Simulate Active Disable simulation to return to process

monitoring. Advisory Excessive Deviation Advisory Excessive Rate of

Change

Maintenance CJC Degraded If T/C sensors are being used, restart the

Maintenance Body Temperature Out

of Range

Maintenance Sensor 1 Degraded Confirm the operating range of Sensor 1

Maintenance Sensor 2 Degraded Confirm the operating range of Sensor 2

Maintenance Sensor 3 Degraded Confirm the operating range of Sensor 3

Maintenance Sensor 4 Degraded Confirm the operating range of Sensor 4

Maintenance Sensor 5 Degraded Confirm the operating range of Sensor 5

Maintenance Sensor 6 Degraded Confirm the operating range of Sensor 6

Maintenance Sensor 7 Degraded Conform the operating range of Sensor 7

device. If condition persists, replace the

device.

Verify the ambient temperature is within

operating limits.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

and/or verify the sensor connection and

device environment.

3-14

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Alarm Type Active Event Recommended Action

Maintenance Sensor 8 Degraded Confirm the operating range of Sensor 8

and/or verify the sensor connection and

device environment. Failed Sensor 1 Failure Verify the Sensor 1 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 2 Failure Verify the Sensor 2 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 3 Failure Verify the Sensor 3 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 4 Failure Verify the Sensor 4 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 5 Failure Verify the Sensor 5 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 6 Failure Verify the Sensor 6 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 7 Failure Verify the Sensor 7 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Sensor 8 Failure Verify the Sensor 8 Instrument process is

within the Sensor range and/or confirm

sensor configuration and wiring. Failed Body Temperature

Failure

Failed Hardware/Software

Incompatible

Failed Memory Error Restart the device. If the problem persists,

Failed Electronics Failure Restart the device. If the problem persists,

Verify that the body temperature is within

the operating limits of this device.

Contact Service Center to verify the

Device Information

(RESOURCE.HARDWARE_REV, AND

RESOURCE.RB_SFTWR_REV_ALL).

replace the device.

NOTE

If status is set up to flag failure/warning you will see associated sensor degraded or failure alert.

Transducer Blocks The transducer block allows the user to view and manage the channel

information. There is one T ransducer Block for th e eight sensors that contains specific temperature measurement data, including:

•Sensor Type

• Engineering Units

• Damping

• Temperature Compensation

• Diagnostics

3-15

Rosemount 848T

A/D

Signal

Conversion

CJC

Diagnostics

Linearization

Temperature

Compensation

Damping

Units/Ranging

3 4

5 6 7 8

9 10 11 12

S5 S6

S8 DS1 DS2

DS3 DS4 BT

Channel

Channel Channel

Channel Channel Channel

Channel Channel

Channel

Channel Channel

Measurement

Validation

Table 3-8. Channel Definitions for the 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Transducer Block Channel Definitions

The 848T supports multiple sensor inputs. Each input has a channel assigned to it allowing an AI or MAI Function Blocks to be linked to that input. The channels for the 848T are as follows:

Channel Description Channel Description

1 Sensor One 16 Sensor 3 Deviation 2 Sensor Two 17 Sensor 4 Deviation 3 Sensor Three 18 Sensor 5 Deviation 4 Sensor Four 19 Sensor 6 Deviation 5 Sensor Five 20 Sensor 7 Deviation 6 Sensor Six 21 Sensor 8 Deviation 7 Sensor Seven 22 Sensor 1 Rate Change 8 Sensor Eight 23 Sensor 2 Rate Change

9 Differential Sensor 1 24 Sensor 3 Rate Change 10 Differential Sensor 2 25 Sensor 4 Rate Change 11 Differential Sensor 3 26 Sensor 5 Rate Change 12 Differential Sensor 4 27 Sensor 6 Rate Change 13 Body Temperature 28 Sensor 7 Rate Change 14 Sensor 1 Deviation 29 Sensor 8 Rate Change 15 Sensor 2 Deviation

Figure 3-1. Transducer Block Data Flow

3-16

Transducer Block Errors

The following conditions are reported in the BLOCK_ERR and XD_ERROR parameters.

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-9. Block/Transducer Error

Rosemount 848T

Condition Number, Name, and Description

0 Other 7 Input failure/process variable has bad status

15 Out of service: The actual mode is out of service

BLOCK_ERR

(1) If BLOCK_ERR is “other,” then see XD_ERROR.

Transducer Block Modes

The transducer block supports two modes of operation as defined by the MODE_BLK parameter:

Automatic (Auto)

The block outputs reflect the analog input measurement.

Out of Service (OOS)

The block is not processed. Channel outputs are not updated and the status is set to Bad: Out of Service for each channel. The BLOCK_ERR parameter shows Out of Service . In this mode, chang es can be made to a ll configurable parameters. The target mode of a block may be restricted to one or more of the supported modes.

(1)

Transducer Block Alarm Detection

Alarms are not generated by the transducer block. By correctly handling the status of the channel values, the down stream block (AI or MAI) will generate the necessary alarms for the measurement. The error that generated this alarm can be determined by looking at BLOCK-ERR and XD_ERROR.

Transducer Block Status Handling

Normally, the status of the output channels reflect the status of the measurement value, the operating condition of the measurement electronics card, and any active alarm conditions. In a transducer, PV reflects the value and status quality of the output channels.

Table 3-10. Transducer Block Parameters

Number Parameter Description

0 BLOCK 1 ST_REV The revision level of the static data associated with the function block. 2 TAG_DESC The user description of the intended application of the block. 3 STRATEGY The strategy field can be used to identify grouping of blocks. 4 ALERT_KEY The identification number of the plant unit. 5 MODE_BLK The actual, target, permitted, and normal modes of the block. 6 BLOCK_ERR This parameter reflects the error status associated with the hardware or software

7 UPDATE_EVENT This alert is generated by any change to the static data. 8 BLOCK_ALM The BLOCK-ALM is used for all configuration, hardware, connection failure or system

9 TRANSDUCER_DIRECTORY A directory that specified the number and stating indices of the transducers in the

10 TRANSDUCER_TYPE Identifies the transducer that follows 101 – Standard Temperature with Calibration. 11 XD_ERROR Provides additional error codes related to transducer blocks. For a list of enumeration

components associated with a block. Multiple errors may be shown. For a list of enumeration values, see FF-890, Block_Err formal model.

problems in the block. The cause of the alert is entered in the subcode field. The first alert to become active will set the Active status in the Status attribute. As soon as the Unreported status is cleared by the alert reporting task, another block alert may be reported without clearing the Active status, if the subcode has changed.

transducer block.

values, see FF-902. Please see tables below for a list of sub-parameters that pertain to XD_ERROR messages.

3-17

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Table 3-10. Transducer Block Parameters

Number Parameter Description

12 COLLECTION_DIRECTORY A directory that specifies the number, starting indices, and DD Item ID’s of the data

collections in each transducer block.

13 SENSOR_1_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 14 PRIMARY_VALUE_1 The measured value and status available to the function block. 15 SENSOR_2_CONFIG Sensor Configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 16 PRIMARY_VALUE_2 The measured value and status available to the function block. 17 SENSOR_3_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 18 PRIMARY_VALUE_3 The measured value and status available to the function block 19 SENSOR_4_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 20 PRIMARY_VALUE_4 The measured value and status available to the function block. 21 SENSOR_5_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 22 PRIMARY_VALUE_5 The measured value and status available to the function block. 23 SENSOR_6_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 24 PRIMARY_VALUE_6 The measured value and status available to the function block. 25 SENSOR_7_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 26 PRIMARY_VALUE_7 The measured value and status available to the function block. 27 SENSOR_8_CONFIG Sensor Configuration Parameters. Please see tables below for a list of sub-parameters

that pertain to Sensor Configuration functions. 28 PRIMARY_VALUE_8 The measured value and status available to the function block 29 SENSOR_STATUS Status of each individual sensor. Please see tables below for a list of possible status

messages. 30 SENSOR_CAL Parameter structure to allow for calibration of each sensor. Please see tables below for a

list of sub-parameters that pertain to Sensor Calibration functions. 31 CAL_STATUS Status of the calibration that was previously performed. Please see tables below for a list

of possible Calibration Statuses. 32 ASIC_REJECTION A configurable power line noise rejection setting. 33 BODY_TEMP Body Temperature of the device. 34 BODY_TEMP_RANGE The range of the body temperature including the units index. 35 TB_SUMMARY_STATUS Overall summary status of the sensor transducer. Please see tables below for a list of

possible transducer statuses. 36 DUAL_SENSOR_1_CONFIG Parameter structure to allow for calibration of each differential measurement. Please see

tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions. 37 DUAL_SENSOR_VALUE_1 The measured value and status available to the function block. 38 DUAL_SENSOR_2_CONFIG Parameter structure to allow for calibration of each differential measurement. Please see

tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions. 39 DUAL_SENSOR_VALUE_2 The measured value and status available to the function block. 40 DUAL_SENSOR_3_CONFIG Parameter structure to allow for calibration of each differential measurement. Please see

tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions. 41 DUAL_SENSOR_VALUE_3 The measured value and status available to the function block. 42 DUAL_SENSOR_4_CONFIG Parameter structure to allow for calibration of each differential measurement. Please see

tables below for a list of sub-parameters that pertain to Dual Sensor Calibration functions. 43 DUAL_SENSOR_VALUE_4 The measured value and status available to the function block. 44 DUAL_SENSOR_STATUS Status of each individual differential measurement. Please see tables below for a list of

possible Dual Sensor statuses. 45 VALIDATION_SNSR1_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 46 VALIDATION_SNSR1_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 47 VALIDATION_SNSR2_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions.

3-18

October 2011

Reference Manual

00809-0100-4697, Rev EA October 2011

Table 3-10. Transducer Block Parameters

Number Parameter Description

48 VALIDATION_SNSR2_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 49 VALIDATION_SNSR3_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 50 VALIDATION_SNSR3_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 51 VALIDATION_SNSR4_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 52 VALIDATION_SNSR4_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 53 VALIDATION_SNSR5_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 54 VALIDATION_SNSR5_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 55 VALIDATION_SNSR6_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 56 VALIDATION_SNSR6_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 57 VALIDATION_SNSR7_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 58 VALIDATION_SNSR7_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values. 59 VALIDATION_SNSR8_CONFIG Validation configuration parameters. Please see tables below for a list of sub-parameters

that pertain to Validation Configuration functions. 60 VALIDATION_SNSR8_VALUES Validation value parameters. Please see tables below for a list of sub-parameters that

pertain to Validation values.

Rosemount 848T

Changing the Sensor Configuration in the Transducer Block

If the F

OUNDATION fieldbus configuration tool or host system does not support

the use of DD methods for device configuration, the following steps illustrate how to change the sensor configuration in the transducer block:

1. Set the MODE_BLK.T ARGET to OOS, or set the SENSOR_MODE to configuration.

2. Set SENSOR_n_CONFIG.SENSOR to the appropriate sensor type, and then set SENSOR_n_CONFIG.CONNECTION to the appropriate type and connection.

3. In the Transducer Block, set MODE_BLK.TARGET to AUTO, or set the SENSOR_MODE to operation.

3-19

Rosemount 848T

Transducer Block Sub-Parameter Tables

Table 3-11. XD_ERROR Sub-Parameter Structure

Reference Manual

00809-0100-4697, Rev EA

XD ERROR Description

0 No Error

General Error An error has occurred that could not be classified as

Calibration Error An error occurred during calibration of the device or a

Configuration Error An error occurred during configuration of the device or

20 Electronics Failure An electronic component has failed. 22 I/O Failure An I/O failure has occurred.

Data Integrity Error Indicates that data stored within the system may no

Software Error The software has detected an error. This could be

Algorithm Error The algorithm used in the transducer block produced

one of the errors listed below.

calibration error has been detected during operation of the device.

a configuration error has been detected during operation of the device.

longer be valid due to non-volatile memory checksum failure, data verify after write failure, etc.

caused by an improper interrupt service routine, an arithmetic overflow, a watchdog timer, etc.

an error. This could be due to an overflow, data reasonableness.

October 2011

Table 3-12. SENSOR_CONFIG Sub-Parameter Structure

SENSOR CONFIG STRUCTURE

Parameter Description

SENSOR_MODE Disables or enables a sensor for configuration. SENSOR_TAG Sensor description. SERIAL_NUMBER Serial number for the attached sensor. SENSOR Sensor Type and Connection. MSB is the sensor type and

LSB is the connection.

DAMPING Sampling Interval used to smooth output using a first order

linear filter. A value entered between 0 and the Update_Rate, will result in a damping value equal to the Update_Rate.

INPUT_TRANSIENT_FILTER Enables or Disables the option for reporting fast changing

sensor inputs without temporary holdoff. 0 = Disable, 1 = Enabled.

RTD_2_WIRE_OFFSET User entered value for constant lead-wire resistance

correction in a 2-wire RTD and Ohm sensor types.

ENG_UNITS The engineering units used for reporting measured sensor

values.

UPPER_RANGE The upper sensor limit for the selected sensor is displayed

using Units_Index sub parameter.

LOWER_RANGE The lower sensor limit for the selected sensor is displayed

using Units_Index sub parameter.

3-20

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Table 3-13. SENSOR_STATUS Sub-Parameter Structure

Table 3-14. SENSOR_CAL Sub-Parameter Structure

Sensor Status Table

0x00 Active 0x01 Out of Service 0x02 Inactive 0x04 Open 0x08 Short 0x10 Out of Range 0x20 Beyond Limits 0x40 Excess EMF Detected 0x80 Other

SENSOR CALIBRATION STRUCTURE

Parameter Description

SENSOR_NUMBER The sensor number to calibrate

CALIB_POINT_HI The High calibration point for the selected sensor

CALIB_POINT_LO The Low calibration point for the selected sensor

CALIB_UNIT The engineering units used for calibrating the sensor

The method of the last calibration for sensor

CALIB_METHOD

CALIB_INFO Information regarding the calibration

CALIB_DATE Date that the calibration was completed

CALIB_MIN_SPAN

CALIB_PT_HI_LIMIT The High calibration unit

CALIB_PT_LO_LIMIT The Low calibration unit

103 - factory trim standard calibration 104 - user trim standard calibration

The minimum calibration span value allowed. This minimum span information is necessary to ensure that when calibration is done, the two calibrated points are not too close together

Table 3-15. CAL_STATUS Structure

Table 3-16. Transducer Status Sub-Parameter Structure

Cal Status

0 No Command Active 1 Command Executing 2 Command Done 3 Command Done: Errors

Transducer Status Table

0x01 A/D Failure 0x02 Sensor Failure 0x04 Dual Sensor Failure 0x08 CJC Degraded 0x10 CJC Failure 0x20 Body Temp Failure 0x40 Sensor Degraded 0x80 Body Temperature Degraded

3-21

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Table 3-17. DUAL_SENSOR CONFIG Sub-Parameter Structure

Table 3-18. DUAL_SENSOR_ STATUS Sub-Parameter Structure

DUAL SENSOR CONFIG STRUCTURE

Parameter Description

DUAL_SENSOR_MODE Disables or enables a sensor for configuration

DUAL_SENSOR_TAG Differential description

INPUT_A Sensor to be used in DUAL_SENSOR_CALC INPUT_B Sensor to be used in DUAL_SENSOR_CALC

Equation used for the dual sensor measurement including:

DUAL_SENSOR_CALC

ENG_UNITS Units used to display sensor parameter

UPPER_RANGE Upper Differential Limit (Input A High - Input B Low)

LOWER_RANGE Lower Differential Limit (Input A Low - Input B High)

Dual Sensor Status Table

0x00 Active 0x01 Out of Service 0x02 Inactive 0x04 Component Sensor Open 0x08 Component Sensor Short 0x10 Component Sensor Out of Range or Degraded 0x20 Component Sensor Out of Limits 0x40 Component Sensor Inactive 0x80 Configuration Error

Not Used, Difference (Input A - Input B), and Absolute Difference (Input A - Input B)

Table 3-19. Validation Value Sub-Parameter Structure

Validation Value Sub-Parameter Structure

Parameter Description

VALIDATION_STATUS

DEVIATION_VALUE Deviation output value

DEVIATION_STATUS Status of the deviation output

RATE_OF_CHANGE_VALUE Rate of change value output

RATE_OF_CHANGE_STATUS Status of Rate of change output

State of the channel specific measurement validation measurement

3-22

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Table 3-20. Validation Config Sub-Parameter Structure

Validation Value Sub-Parameter Structure

Parameter Description

Activates the measurement validation data gathering

VALIDATION_MODE

SAMPLE_RATE

DEVIATION_LIMIT

DEVIATION_ENG_UNITS Units tied to the deviation output value

DEVIATION_ALERT_SEVERITY

DEVIATION_PCNT_LIM_HYST

RATE_INCREASING_LIMIT Increasing Rate of Change limit set point

RATE_DECREASING_LIMIT Decreasing Rate of Change limit set point

RATE_ENG_UNITS Units tied to the rate of change output value

RATE_ALERT_SEVERITY

RATE_PCNT_LIM_HYST

process

0 = Disable

1 = Enable

Number of seconds per sample used for measurement validation data collection. This shouldn't exceed 10 seconds per sample, but currently there are no upper limits.

Sets the limit for the deviation diagnostic. DD limits the upper range to 10.

Advisory, Maintenance, Failure

0 = Disabled = Does not use the limits, but provides an output 1 = Advisory = No effect on sensor status, sets advisory PWA 2 = Maint = Sets sensor status to uncertain, sets

advisory PWA

3 = Failure = Sets sensor status to Bad, sets advisory PWA

Deviation Hysteresis Limit = (1 DEVIATION_PCNT_LIM_HYST/100) * DEVIATION_LIMIT

Advisory, Maintenance, Failure

0 = Disabled = Does not use the limits, but provides an output 1 = Advisory = No effect on sensor status, sets advisory PWA 2 = Maint = Sets sensor status to uncertain, sets advisory PWA 3 = Failure = Sets sensor status to Bad, sets advisory PWA

Rate of Change Increasing Hysteresis Limit = (1 RATE_PCNT_LIM_HYST/100) * RATE_INCREASING_LIMIT

Sensor Calibration in the Sensor Transducer Block

If the F

OUNDATION fieldbus configuration tool or host system does not support

the use of DD methods for device configuration, the following steps illustrate how to calibrate the sensor from the sensor transducer block:

NOTE:

Active calibrators should not be used in conduction with RTDs on any multiple input temperature transmitter such as the 848T.

3-23

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

1. Under SENSOR_CALIB, the SENSOR_NUMBER to the number of the sensor to calibrate.

2. Set CALIB_UNIT to calibration unit.

3. Set CALIB_METHOD to User Trim (seeTable 3-8 on page 3-16 for valid values).

4. Set the input value of the sensor simulator to be within the range defined by CALIB_LO_LIMIT and CALIB_HI_LIMIT.

5. Set CALIB_POINT_LO (CALIB_POINT_HI) to the value set at the sensor simulator.

6. Read CALIB_STATUS and wait until it reads “Command Done”

7. Repeat steps 3 to 5 if performing a two-point trim. Note that the difference in values between CALIB_POINT_LO and CALIB_POINT_HI must be greater than CALIB_MIN_SPAN.

3-24

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Section 4 Operation and Maintenance

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-1

Foundation fieldbus Information . . . . . . . . . . . . . . . . . . . . page 4-1

Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 4-3

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page 4-4

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

Warnings

FOUNDATION FIELDBUS INFORMATION

Failure to follow these installation guidelines could result in death or serious injury.

• Make sure only qualified personnel perform the installation.

Process leaks could result in death or serious injury.

• Do not remove the thermowell while in operation. Removing while in operation may cause process fluid leaks.

• Install and tighten thermowells and sensors before applying pressure, or process leakage may result.

Electrical shock could cause death or serious injury.

• If the senor is installed in a high voltage environment and a fault condition or installation error occurs, high voltage may be present on transmitter leads and terminals.

• Use extreme caution when making contact with the leads and terminals.

FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop communication protocol that interconnects devices such as transmitters and valve controllers. It is a local area network (LAN) for instruments that enable basic control and I/O to be moved to the field devices. The Model 848T uses F

OUNDATION fieldbus technology developed and supported by Emerson

Process Management and the other members of the independent Fieldbus F

OUNDATION.

www.rosemount.com

Rosemount 848T

FOUNDATION

Fieldbus

Communications

Stack

Analog-to-Digital

Signal

Conversion

Cold Junction

Input-to-Output

Isolation

Resource Block

•physical device information

Function Blocks

•AI, MAI, and ISEL

Transducer Block Measurement Sensor

•sensor and differential temp

•terminal temp.

•sensor configuration

•calibration

•diagnostics

(8 sensors)

T able 4-1. Block Dia gram for the Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Commissioning (Addressing)

To be able to setup, configure, and have it commu nicate with other devices on a segment, a device must be assigned a permanent address. Unless requested otherwise, it is assigned a temporary address when shipped from the factory.

If there are two or more devices on a segment with the same address, the first device to start up will use the assigned addre ss (ex. Address 20 ). Each of the other devices will be given one of the four available temporary addresses. If a temporary address is not available, the device will be unavailable until a temporary address becomes available.

Use the host system documentation to commission a device and assign a permanent address.

4-2

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

HARDWARE MAINTENANCE

The 848T has no moving parts and require s a minimal amount of scheduled maintenance. If a malfunction is suspected, check for an external cause before performing the diagnostics presented below.

Sensor Check T o determine whether the sensor is causing the malfunction, connect a sensor

calibrator or simulator locally at the transmitter. Consult an Emerson Process Management representative for additional temperature sensor and accessory assistance.

Communication/Power Check

Resetting the Configuration (RESTART)

If the transmitter does not communicate or provides an erratic output, check for adequate voltage to the transmitter. The transmitter requires between 9.0 and 32.0 VDC at the terminals to operate with complete functionality. Check for wire shorts, open circuits, and multiple grounds.

There are two types of restart s available in the Resource Block. The following section outlines the usage for each of these. For further information, see RESTART in Table 3-2 on page 3-6.

Restart Processor (cycling)

Performing a Restart Processor has the same ef fect as removing p ower from the device and reapplying power.

Restart with Defaults

Performing a Restart with Defaults resets the static parameters for all of the blocks to their initial state. This is commonly used to change the configur ation and/or control strategy of the device, including any custom configurations done at the Rosemount factory.

4-3

Rosemount 848T

TROUBLESHOOTING FOUNDATION fieldbus

Symptom Possible Cause Corrective Action

Device does not show up in the live list

Device that is acting as a LAS does not send out CD

All devices go off live list and then return

Network configuration parameters are incorrect

Network address is not in polled range

Power to the device is below the 9 VDC minimum

Noise on the power / communication is too high

LAS Scheduler was not downloaded to the Backup LAS device

Live list must be reconstructed by Backup LAS device

Set the network parameters of the LAS (host system) according to the FF Communications Profile

ST: 8 MRD: 4 DLPDU PhLO: 4 MID: 7 TSC: 4 (1 ms) T1: 96000 (3 seconds) T2: 9600000 (300 seconds) T3: 480000 (15 seconds) Set first Unpolled Node and Number of UnPolled Nodes so that the device

address is within range Increase the power to at least 9V

Verify terminators and power conditioners are within specification Verify that the shield is properly terminated and not grounded at both ends. It is best to ground the shield at the power conditioner

Ensure that all of the devices that are intended to be a Backup LAS are marked to receive the LAS schedule

Current link setting and configured links settings are different. Set the current link setting equal to the configured settings.

Reference Manual

00809-0100-4697, Rev EA

October 2011

Resource Block

Symptom Possible Causes Corrective Action

Mode will not leave OOS

Block Alarms Will not work

Target mode not set Set target mode to something other than OOS.

Memory Failure BLOCK_ERR will show the lost NV Data or Lost Static Data bit set. Restart the

device by setting RESTART to Processor. If the block error does not clear, call the factory.

Features FEATURES_SEL does not have Alerts enabled. Enable the report bit.

Notification LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.

Transducer Block Troubleshooting

Symptom Possible Causes Corrective Action

Mode will not leave OOS

The primary value is BAD

Target mode not set Set target mode to something other than OOS. A/D board check sum error The A/D board has a checksum error. Resource block The actual mode of the Resource block is in OOS. See Resource Block

Diagnostics for corrective action. Transducer Block The actual mode of the Transducer Block is OOS. Measurement Look at the SENSOR_STATUS parameter (See Table 3-16 on page 3-21)

4-4

Reference Manual

00809-0100-4697, Rev EA October 2011

Appendix A Reference Data

Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . page A-1

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-3

Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . page A-4

Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-4

Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-8

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page A-12

Rosemount 848T

FUNCTIONAL SPECIFICATIONS

Inputs

Eight independently configurable channels including combinations of 2- and 3-wire RTDs, thermocouples, mV, 2- and 3-wire and ohm inputs.

4–20 mA inputs using optional connector(s).

Outputs

Manchester-encoded digital signal that conforms to IEC 61158 and ISA 50.02.

Status

• 600 Vdc channel to channel isolation

• 10 Vdc channel to channel isolation for all operating conditions with maximum 150 m. (500 ft) of sensor lead length 18 AWG.

Ambient Temperature Limits

–40 to 185 °F (–40 to 85 °C)

Isolation

Isolation between all sensor channels is rated to 10Vdc over all op erating conditions. No damage will occur to the device with up to 600 Vdc between any sensor channel.

Power Supply

Powered over F The transmitter operates betwee n 9. 0 an d 32 .0 V dc , 22 mA max imu m . (Transmitter power terminals are rated to 42.4 V dc.)

OUNDATION fieldbus with standard fieldbus power supplies.

(1)

www.rosemount.com

(1) Reference conditions are -40 to 60 °C (-40 to 140 °F) with 30 m. (100 ft) of sensor lead

length 18 AWG wire.

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Transient Protection

The transient protector (option code T1) helps to prevent damage to the transmitter from transients induced on the loop wiring by lightning, welding, heavy electrical equipment, or switch gears. This option is installed at the factory for the Rosemount 848T and is not intended for field installation.

Update Time

Approximately 1.5 seconds to read all 8 inputs.

Humidity Limits

0–99% non-condensing relative humidity

Turn-on Time

Performance within specifications is achieved in less than 30 seconds after power is applied to the transmitter.

Alarms

The AI and ISEL function blocks allow the user to configure the alarms to HI-HI, HI, LO, or LO-LO with a variety of priority levels and hystere sis settings.

Backup Link Active Scheduler (LAS)

The transmitter is classified as a device link master, which means it can function as a Link Active Scheduler (LAS) if the current link master device fails or is removed from the segment.

The host or other configuration tool is used to download the schedule for the application to the link master device. In the absence of a primary link master, the transmitter will claim the LAS and provide permanent control for the H1 segment.

OUNDATION fieldbus Parameters

Schedule Entries 20 Links 30 Virtual Communications Relationships (VCR) 20

A-2

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

PHYSICAL SPECIFICATIONS

Mounting

The Rosemount 848T can be mounted directly onto a DIN rail or it can be ordered with an optional junction box. When using the optional junction box, the transmitter can be mounted onto a p an el or a 2- in. pi pe stand (with option code B6).

Entries for Optional Junction Box

No entry

• Used for custom fittings

Cable Gland

• 9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable

Conduit

• 5 plugged 0.86-in. diameter holes suitable for installing

Materials of Construction for Optional Junction Box

Junction Box Type Paint

Aluminum Epoxy Resin Plastic NA Stainless Steel NA Aluminum Explosion-proof NA

/2-in. NPT fittings.

Weight

Assembly Weight

oz lb kg

Rosemount 848T only 7.5 .47 .208 Aluminum Plastic Stainless Steel Aluminum Explosion-proof 557 34.8 15.5

(1) Add 35.2 oz. (2.2 lb., 0.998 kg) for nickel-plated brass glands

(1)

78.2 4.89 2.22

77.0 4.81 2.18

Environmental Ratings

NEMA Type 4X and IP66 with optional junction box. JX3 Explosion-proof enclosure rated to -4 °F (-20 °C).

A-3

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

FUNCTION BLOCKS

Analog Input (AI)

• Processes the measurement and makes it available on the fieldbus segment.

• Allows filtering, alarming, and engineering unit changes.

Input Selector (ISEL)

• Used to select between inputs and generate an output using specific selection strategies such as minimum, maximum, midpoint, or average temperature.

• Since the temperature value always contains the measurement status, this block allows the selection to be restricted to the first “good” measurement.

Multiple Analog Input Block (MAI)

• The MAI block allows the eight AI blocks to be multiplexed together so they serve as one function block on the H1 segment, resulting in greater network efficiency.

PERFORMANCE SPECIFICATIONS

Stability

• ±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 2 years for RTDs

• ±0.1% of reading or 0.1 °C (0.18 °F), whichever is greater, for 1 year for thermocouples.

Self Calibration

The transmitter’s analog-to-digital circuitry automatically self-calibrates for each temperature update by comparing the dynamic measurement to extremely stable and accurate internal reference elements.

Vibration Effect

Transmitters are tested to high pipeline vibration specification per IEC 60770-1 1999 with no effect on performance.

Electromagnetic Compatibility Compliance Testing

• Meets the criteria under IEC 61326:2006

• Meets the criteria under European Union Directive 2004/108/EC

A-4

Reference Manual

X = Sensor A minimum - Sensor B max. Y = Sensor A maximum - Sensor B min.

00809-0100-4697, Rev EA October 2011

Accuracy

Table 1. Input Options/Accuracy

Input Ranges Accuracy Over Range(s)

Sensor Option 2- and 3-Wire RTDs

Pt 50 ( = 0.00391) GOST 6651-94 –200 to 550 –328 to 1022 ± 0.57 ± 1.03 Pt 100 ( = 0.00391) GOST 6651-94 –200 to 550 –328 to 1022 ± 0.28 ± 0.50 Pt 100 ( = 0.00385) IEC 751;  = 0.00385, 1995 –200 to 850 –328 to 1562 ± 0.30 ± 0.54 Pt 100 ( = 0.003916) JIS 1604, 1981 –200 to 645 –328 to 1193 ± 0.30 ± 0.54 Pt 200 ( = 0.00385) IEC 751;  = 0.00385, 1995 –200 to 850 –328 to 1562 ± 0.54 ± 0.98 Pt 200 ( = 0.003916) JIS 1604;  = 0.003916, 1981 –200 to 645 –328 to 1193 ± 0.54 ± 0.98 Pt 500 IEC 751;  = 0.00385, 1995 –200 to 850 –328 to 1562 ± 0.38 ± 0.68 Pt 1000 IEC 751;  = 0.00385, 1995 –200 to 300 –328 to 572 ± 0.40 ± 0.72 Ni 120 Edison Curve No. 7 –70 to 300 –94 to 572 ± 0.30 ± 0.54 Cu 10 Edison Copper Winding No. 15 –50 to 250 –58 to 482 ± 3.20 ± 5.76 Cu 100 (a=428) GOST 6651-94 -185 to 200 -365 to 392 ± 0.48 ±0.86 Cu 50 (a=428) GOST 6651-94 -185 to 200 -365 to 392 ± 0.96 ±1.73 Cu 100 (a=426) GOST 6651-94 -50 to 200 -122 to 392 ± 0.48 ±0.86 Cu 50 (a=426) GOST 6651-94 -50 to 200 -122 to 392 ± 0.96 ±1.73

Thermocouples—Cold Junction Adds + 0.5 °C to Listed Accuracy

NIST Type B (Accuracy varies according to input range) NIST Type E NIST Monograph 175 –200 to 1000 –328 to 1832 ± 0.40 ± 0.72 NIST Type J NIST Monograph 175 –180 to 760 –292 to 1400 ± 0.70 ± 1.26

NIST Type K NIST Monograph 175 –180 to 1372 –292 to 2501 ± 1.00 ± 1.80 NIST Type N NIST Monograph 175 –200 to 1300 –328 to 2372 ± 1.00 ± 1.80 NIST Type R NIST Monograph 175 0 to 1768 32 to 3214 ± 1.50 ± 2.70 NIST Type S NIST Monograph 175 0 to 1768 32 to 3214 ± 1.40 ± 2.52 NIST Type T NIST Monograph 175 –200 to 400 –328 to 752 ± 0.70 ± 1.26 DIN L DIN 43710 –200 to 900 –328 to 1652 ± 0.70 ± 1.26 DIN U DIN 43710 –200 to 600 –328 to 1112 ± 0.70 ± 1.26 w5Re26/W26Re ASTME 988-96 0 to 2000 32 to 3632 ± 1.60 ± 2.88

GOST Type L GOST R 8.585-2001 -200 to 800 -392 to 1472 ± 0.71 ± 1.28 Terminal Temperature -50 to 85 -58 to 185 ±3.50 ± 6.30 Ohm Input 0 to 2000 ohms ± 0.90 ohms Millivolt Input -10 to 100 mV ± 0.05 mV 1000 mV -10 to 1000 mV ± 1.0 mA 4–20 mA (Rosemount) 4–20 mA (NAMUR)

Multipoint Sensors

(1) Requires the S002 option code. (2) Multipoint (up to 8 points) thermocouples and RTDs are available f or purchase with t he Rosemount 848T. Input ranges and accuracy for these sensors will

depend on the specific multipoint sensor chosen. For more information, contact your local Emerson representative.

(1)

(2)

Sensor Reference °C °F °C °F

NIST Monograph 175 100 to 300

301 to 1820

4–20 mA ± 0.01 mA 4–20 mA ± 0.01 mA

Rosemount 848T

212 to 572

573 to 3308

± 6.00 ± 1.54

± 10.80

± 2.78

Differential Configuration Notes

Differential capability exists between any two sensor types. For all differential configurations, the input range is X to Y where

Accuracy for Differential Configurations: If sensor types are similar (for example, both RTDs or both thermocouples), the accuracy = 1.5 times worst case accuracy of either sensor type.

If sensor types are dissimilar (for example, one RTD and one thermocouple), the accuracy = Sensor 1 Accuracy + Sensor 2 Accuracy.

A-5

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Analog Sensors 4–20mA

Two types of 4–20 mA sensors are compatible with the Rosemount 848T. These types must be ordered with the S002 option code complete with an analog connector kit. The alarm levels, accuracy for each type are listed in Table2.

Table 2. Analog Sensors

Sensor Option

4–20mA (Rosemount Standard)

4–20mA (NAMUR) 3.8 to 20.5 mA ± 0.01mA

Alarm Levels Accuracy

3.9 to 20.8 mA ± 0.01mA

October 2011

A-6

Reference Manual

00809-0100-4697, Rev EA October 2011

Ambient Temperature Effect

Transmitter may be installed in locations where the ambient temperature is between -40 and 85 °C (-40 and 185 °F)

Table 3. Ambient Temperature Effects

NIST Type Accuracy per 1.0 °C (1.8 °F) Change in Ambient Temperature RTD

Pt 50 ( = 0.00391) Pt 100 ( = 0.00391) Pt 100 ( = 0.00385) Pt 100 ( = 0.003916) Pt 200 ( = 0.003916) Pt 200 ( = 0.00385) Pt 500 Pt 1000 Cu 10 Cu 100 (a=428) Cu 50 (a=428) Cu 100 (a=426) Cu 50 (a=426) Ni 120 Thermocouple (R = the value of the reading)

Type B

Type E Type J, DIN Type L

Type K

Type N Type R, Type S

Type T, DIN Type U

GOST Type L

Millivolt 2- and 3-wire Ohm 4–20 mA (Rosemount) 4-20 mA (NAMUR)

(1) Change in ambient is in reference to the calibration temperature of the transmitter (20 °C (68 °F) typical from the factory).

• 0.004 °C (0.0072 °F)

• 0.002 °C (0.0036 °F)

• 0.003 °C (0.0054 °F)

• 0.004 °C (0.0072 °F)

• 0.003 °C (0.0054 °F)

• 0.03 °C (0.054 °F)

• 0.002 °C (0.0036 °F)

• 0.004 °C (.0072 °F)

• 0.002 °C (0.0036 °F)

• 0.004 °C (.0072 °F)

• 0.003 °C (0.0054 °F)

• 0.014 °C

• 0.032 °C - (0.0025% of (R - 300))

• 0.054 °C - (0.011% of (R - 100))

• 0.005 °C + (0.00043% of R) •All

• 0.0054 °C + (0.00029% of R)

• 0.0054 °C + (0.0025% of |R|)

• 0.0061 °C + (0.00054% of R)

• 0.0061 °C + (0.0025% of |R|)

• 0.0068 °C + (0.00036% of R) •All

• 0.016 °C

• 0.023 °C - (0.0036% of R)

• 0.0064 °C

• 0.0064 °C + (0.0043% of |R|)

• 0.007 °C

• 0.007 °C + (0.003% of IRI)

• 0.0005 mV

• 0.0084 ohms

• 0.0001 mA

(1)

Rosemount 848T

Temperature Range (°C)

NA NA NA NA NA NA NA NA NA NA NA NA NA NA

•R 1000

•300  R < 1000

•100  R < 300

•R  0

•R 0

•R  0

•R 0

•R  200

•R 200

•R  0

•R 0

•R 0

•R  0

NA NA NA NA

A-7

Rosemount 848T

0.3020.03

+ 0.30C=

Top View

3-D View

Side View

Security Switch

Simulation Switch

6.7

(170)

3.7

(93)

1.7

(43)

Removable Wiring

Connection

Reference Manual

00809-0100-4697, Rev EA

October 2011

Ambient Temperature Notes Examples:

When using a Pt 100 ( = 0.00385) sensor input at 30 °C am b ien t temperature:

• Digital Temperature Effects: 0.003 °C x (30 - 20) = .03 °C

• Worst Case Error: Digital + Digital Temperature Effects = 0.3 °C + .03 °C = .33 °C

• Total Probable Error

DIMENSIONAL DRAWINGS

Junction Boxes with no entries (option codes JP1, JA1, and JS1)– external dimensions are the same as those outlined for the other junction box materials in this section.

Rosemount 848T

A-8

Dimensions are in inches (millimeters)

Reference Manual

Top View 3-D View

Front View

Side View

4.41 (112)

10.24 (260)

1.73 (44)

2.44 (62)

2.28 (58)

1.10 (28)

7.84 (199.2)

6.30 (160)

3.78 (96)

1.57 (40)

Ground Screw

Top View

3-D View

Front View

Side View

9.91 (231)

7.7 (196)

4.0 (102)

1.8 (47)

1.2 (30)

2.4 (62)

1.1 (28)

1.8 (46)

1.73 (44)

6.61 (168)

9.14 (232.2)

Ground Screw

7.72 (196)

00809-0100-4697, Rev EA October 2011

Aluminum/Plastic Junction Box—Cable Gland (option codes JA2 and JP2)

Rosemount 848T

Dimensions are in inches (millimeters)

Stainless Steel Junction Box—Cable Gland (option code JS2)

Dimensions are in inches (millimeters)

A-9

Rosemount 848T

Top View

3-D View

Front View Side View

10.2 (260)

157 (40)

2.44 (62)

3.5 (89)

1.7 (42)

10.2 (260)

Five Plugged 0.86-in. diameter holes suitable for installing

/2-in.

NPT fittings

Top View

3-D View

Front View

Side View

9.1 (231)

7.7 (196)

2.8 (70)

1.2 (30)

1.4 (35)

1.1 (27)

2.4 (62)

1.6 (42)

0.06 (1.5)

1.8 (4.7)

4.0 (102)

Ground Screw

Five Plugged 0.86-in. diameter holes suitable for installing 1/2-in. NPT fittings

Aluminum/Plastic Junction Box—Conduit Entry (option codes JA3 and JP3)

Reference Manual

00809-0100-4697, Rev EA

October 2011

A-10

Dimensions are in inches (millimeters)

Stainless Steel Junction Box—Conduit Entry (option code JS3)

Dimensions are in inches (millimeters)

Reference Manual

5.1

(130)

10.2

(260)

6.6 (167) fully assembled

4.5

(114)

7.5 (190) fully assembled

00809-0100-4697, Rev EA October 2011

Mounting Options

Rosemount 848T

Aluminum/Plastic Junction Box

(styles JA and JP)

Front View Side View Front View Side View

Dimensions are in inches (millimeters)

Aluminum/Plastic Junction Box

Mounted on a Vertical Pipe

Stainless Steel Junction Box

(style JS)

Stainless Steel Junction Box

Mounted on a Vertical Pipe

A-11

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

October 2011

ORDERING INFORMATION

Table A-1. Rosemount 848T FOUNDATION fieldbus Ordering Information

★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

__The Expanded offering is subject to additional delivery lead time.

Model Product Description

848T High Density Temperature Measurement Family

Transmitter Output Standard Standard

F FOUNDATION fieldbus digital signal (includes AI, MAI, and ISEL function blocks, and Backup Link Active

Scheduler)

Rosemount

Product Certifications Standard Standard

I1 ATEX Intrinsic Safety No ★ I3 NEPSI Intrinsic Safety No ★ I4 TIIS Intrinsically Safety (FISCO) Type '1a’ No ★

H4 TIIS Intrinsic Safety (FISCO) Type '1b’ No ★

(2)

I5 I6

I7 IECEx Intrinsic Safety No ★ IA ATEX FISCO Intrinsic Safety No ★ IE FM FISCO Intrinsically Safe No ★

IG IECEx FISCO (Intrinsic Safety) No ★ N1 ATEX Type n (enclosure required) Yes ★ N5 FM Class I, Division 2, and Dust Ignition-proof (enclosure required) Yes ★ N6 CSA Class I, Division 2 No ★ N7 IECEx Type n (enclosure required) Yes ★ NC ATEX Type n Component (Ex nA nL) No ND ATEX Dust (enclosure required) Yes ★ NJ IECEx Type n Component (Ex nA nL) No NK FM Class 1, Division 2 No ★ NA No Approval No ★

Expanded

E6 CSA Explosion-proof, Dust Ignition-proof, Division 2 (JX3 enclosure required) Yes

FM Intrinsically Safe No ★

(2)

CSA Intrinsically Safe No ★

(2)

CSA FISCO Intrinsically Safe, Division 2 No ★

(1)

Junction Box required?

(3)

(4)

★

Options (Include with selected model number)

Input Types Standard Standard

S001 RTD, Thermocouple, mV, Ohm Inputs ★

(5)

S002

PlantWeb Advanced Diagnostics Standard Standard

D04 Measurement Validation Diagnostic ★

Transient Protection Standard Standard

T1 Integral Transient Protector ★

Mounting Bracket

B6 Mounting Bracket for 2-in. pipe mounting – SST bracket and bolts ★

RTDs, Thermocouple, mV, Ohm and 4–20 mA Inputs ★

A-12

Reference Manual

00809-0100-4697, Rev EA October 2011

Table A-1. Rosemount 848T FOUNDATION fieldbus Ordering Information

★ The Standard offering represents the most common options. The starred options (★) should be selected for best delivery.

__The Expanded offering is subject to additional delivery lead time.

Enclosure Options Standard Standard

JP1 Plastic Junction Box; No Entries ★ JP2 Plastic Box, Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable) ★ JP3 Plastic Box, Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings) ★ JA1 Aluminum Junction Box; No Entries ★ JA2 Aluminum Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable) ★ JA3 Aluminum Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings) ★ JS1 Stainless Steel Junction Box; No Entries ★ JS2 Stainless Steel Box, Cable Glands (9 x M20 nickel-plated brass glands for 7.5–11.9 mm unarmored cable) ★ JS3 Stainless Steel Box, Conduit Entries (5 Plugged Holes, suitable for installing 1/2-in. NPT fittings) ★

(6)

JX3

Software Configuration Standard Standard

C1 Custom Configuration of Date, Descriptor, Message and Wireless Parameters (Requires CDS with Order) ★

Line Filter Standard Standard

F5 50 Hz Line Voltage Filter ★

Calibration Certificate Standard Standard

Q4 Calibration Certificate (3-Point Calibration) ★

Shipboard Certification Standard Standard

SBS American Bureau of Shipping (ABS) Type Approval ★

SLL Lloyd's Register (LR) Type Approval ★

Special Temperature Test Expanded

LT Test to -60 °F (-51.1 °C)

Conduit Electrical Connector Standard Standard

Typical Model Number: 848T F I5 S001 T1 B6 JA2

(1) Consult factory for availability. (2) Available only with S001 option. (3) The Rosemount 848T ordered with component approval is not approved as a stand-alone unit. Additional system certification is required. (4) Enclosure Option JX3 must be ordered with Product Certification Code E6. (O-ring for the JX3 enclosure rated to -20 °C). (5) S002 is only available with Product Certification N5, N6, N1, NC, NK, and NA. (6) JX3 Explosion-proof enclosure rated to -4 °F (-20 °C). (7) Available with no approval or Intrinsically Safe approvals only. For FM Intrinsically Safe (option code I5), install in accordance with Rosemount drawing

00848-4402.

Explosion-proof Box, Conduit Entries (4 Plugged Holes, suitable for installing 1/2-in. NPT fittings) ★

(7)

M12, 4-pin, Male Connector (eurofast®) ★

(7)

A size Mini, 4-pin, Male Connector (minifast®) ★

Rosemount 848T

A-13

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

A-14

Reference Manual

00809-0100-4697, Rev EA October 2011

Appendix B Product Certificates

Hazardous Locations Certificates . . . . . . . . . . . . . . . . . . . page B-1

Intrinsically Safe and Non-Incendive Installations . . . . . page B-11

Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page B-12

HAZARDOUS LOCATIONS CERTIFICATES

Rosemount 848T

North American Approvals

Factory Mutual (FM) Approvals

I5 Intrinsically Safe and Non-Incendive

Intrinsically Safe for use in Class I, Division 1, Groups A, B, C, D; when installed per Rosemount drawing 00848-4404.

Temperature Code: T4 (T

= –40 to 60 °C)

amb

Non-Incendive for use in Class I, Division 2, Groups A, B, C, D (suitable for use with Non-Incendive field wiring) when installed in accordance with Rosemount Drawing 00848-4404.

Temperature Code: T4A (T T5 (T

= -40 to 85 °C)

amb

= -40 to 70 °C)

amb

Rosemount Enclosure Required. Indoor Hazardous (Classified) Locations.

Table B-1. FM Approved Entity Parameters

Power/Bus Sensor

= 30 V

max

= 300 mA

max

Pi = 1.3 W Ci = 2.1 nF Li = 0

(1) Entity parameters apply to entire device, not individual sensor channels.

VOC = 12.5 V ISC= 4.8 mA Po = 15 mW CA = 1.2 F LA = 1 H

(1)

www.rosemount.com

Table B-2. Entity Parameters for Non Incendive Field Wiring

Power/Bus Sensor

= 42.4 V VOC = 12.5 V

max

Ci = 2.1nF I Li = 0 Po = 15 mW

(1) Entity parameters apply to entire device, not individual sensor channel.

(1)

= 4.8 mA

CA = 1.2 F LA = 1 H

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

IE FISCO (Fieldbus Intrinsically Safe Concept) Intrinsic Safety

Intrinsically safe for use in Class I, Division 1, Groups A, B, C, D; when installed in accordance with Rosemount Drawing 00848-4404.

Temperature Code: T4 (T

Non-incendive for use in Class I, Division 2, Groups A, B, C, D (suitable for use with non-incendive field wiring); when installed in accordance with Rosemount Drawing 00848-4404.

Temperature Code: T4A (T T5 (T

Table B-3. Entity Parameters

Power/Bus Sensor

= 17.5 V VOC = 12.5 V

max

= 380 mA I

max

Pi = 5.32 W Po = 15 mW Ci = 2.1nF CA = 1.2 F Li = 0 LA = 1 H

(1) Entity parameters apply to entire device, not individual sensor channels.

= –40 to 60 °C)

amb

= –40 to 85 °C)

amb

= –40 to 70 °C)

amb

= 4.8 mA

(1)

N5 Dust Ignition-Proof

For use in Class II, III, Division 1, Groups E, F, G. Class I, Division 2, Groups A, B, C, D; Non-incendive for Class 1, Division 2, Groups A, B, C, D when installed to Rosemount Control Drawing 00848-4404. Rosemount Enclosure Required. Valid with both S001 and S002 options.

Temperature Code: T4A (T T5 (T

= –40 to 85 °C)

amb

= –40 to 70 °C)

amb

NK Non-Incendive for use in Class I, Division 2, Groups A, B, C, D (suitable

for use with Non-Incendive field wiring) when installed in accordance with Rosemount Drawing 00848-4404.

Temperature Code: T4A (T T5 (T

= -40 to 85 °C)

amb

= -40 to 70 °C)

amb

Rosemount Enclosure Required. Indoor Hazardous (Classified) Locations.

Table B-4. FM Approved Entity Parameters

Power/Bus Sensor

= 42.4 V VOC = 12.5 V

max

Ci = 2.1 F I Li = 0 H Po = 15 mW

(1) Intrinsically safe and non-incendive parameters.

(1)

= 4.8 mA

CA = 1.2 F LA = 1 H

B-2

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Canadian Standards Association (CSA) Certifications

E6 Explosion-Proof and Dust Ignition-Proof

Class I, Division 1, Groups B, C, and D. Class II, Division 1, Groups E, F, and G.

Class III Must be installed in enclosure option JX3.

Install per drawing 00848-1041. Conduit seal not required.

Suitable for use in Class I, Division 2, Groups A, B, C, D. when installed per Rosemount drawing 00848-4405. Temperature Code: T3C = (– 50 T Must be installed in a suitable enclosure as determined acceptable by the local inspection authority.

I6 Intrinsically Safe, Division 2

For use in Class I, Division 1, Groups A, B, C, D; when installed per Rosemount drawing 00848-4405.

Temperature Code: T3C (T

= –50 to 60 °C)

amb

Suitable for Class I, Division 2, Groups A, B, C, D. Rated 42.4 VDC max. Not valid with S002 option.

 60 °C)

amb

Table B-5. CSA Approved Entity Parameters

= 4.8 mA

LA = 1 H

(1)

Power/Bus Sensor

= 30 V VOC = 12.5 V

max

= 300 mA I

max

Ci = 2.1nF Po = 15 mW Li = 0 CA = 1.2 F

(1) Entity parameters apply to entire device, not individual sensor channels.

IF FISCO (Intrinsically Safe)

For use in Class I, Division 1, Groups A, B, C, D; when installed per Rosemount drawing 00848-4405.

Temperature Code: T3C (T

= –50 to 60 °C)

amb

Suitable for Class I, Division 2, Groups A, B, C, D. Rated 42.4 VDC max. Not valid with S002 option.

Table B-6. CSA Approved Entity Parameters

= 4.8 mA

(1)

Power/Bus Sensor

Ui = 17.5 V VOC = 12.5 V Ii = 380 mA I Pi = 5.32 W Po = 15 mW Ci = 2.1nF Ca = 1.2 F Li = 0 La = 1 H

(1) Entity parameters apply to entire device, not individual sensor channels.

B-3

Rosemount 848T

N6 Class I, Division 2

Suitable for use in Class I, Division 2, Groups A, B, C, D. when installed per Rosemount drawing 00848-4405. Temperature Code: T3C = (–50 T Must be installed in a suitable enclosure as determined acceptable by the local inspection authority.

European Approvals ATEX Certifications

I1 Intrinsic Safety

Certification Number: Baseefa09ATEX0093X ATEX Marking II 1 G Ex ia IIC T4 (T

1180

Table B-7. ATEX Approved Entity Parameters

Power/Bus Sensor

Ui = 30 V Uo = 12.5 V Ii = 300 mA Io = 4.8 mA Pi = 1.3 W Po = 15 mW Ci = 0 Ci = 1.2 F Li = 0 Li = 1 H

 60 °C)

= –50 to 60 °C)

amb

Reference Manual

00809-0100-4697, Rev EA

October 2011

Special Conditions for Safe Use (x):

1. This apparatus must be installed in an enclosure which affords it a degree of protection of at least IP20. Non-metallic enclosures must have a surface resistance of less than 1Gohm. Light alloy or zirconium enclosures must be protected from impact and friction when installed.

2. The apparatus will not meet the 500V rms isolation test required by Clause 6.4.12 on EN 60079-1 1:2007. This must be t aken into account when installing the apparatus.

IA FISCO (Fieldbus Intrinsically Safe Concept) Intrinsic Safety

Certificate Number: BASEEFA09ATEX0093X ATEX Marking II 1 G Ex ia IIC T4 (T

= –50 to 60 °C)

amb

1180

Table B-8. ATEX Approved Entity Parameters

Power/Bus Sensor

Ui = 17.5 V Uo = 12.5 V Ii = 380 mA Io = 4.8 mA Pi = 5.32 W Po = 15 mW Ci = 0 Ci = 1.2 F Li = 0 Li = 1 H

B-4

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Special Conditions for Safe Use (x):

2. The apparatus will not meet the 500V rms isolation test required by Clause 6.4.12 on EN 60079-1 1:2007. This must be t aken into account when installing the apparatus.

NE ATEX TYPE ‘n’ APPROVAL

Certification Number: BASEFFA09ATEX0095X ATEX Marking II 3 G Ex nA nL IIC T5 (T

Table B-9. Baseefa Approved Entity Parameters

Power/Bus Sensor

Ui = 42.4 Vdc Uo = 5 Vdc

Ci = 0 Io = 2.5 mA Li = 0 Co = 1000 F

= –40 to 65 °C)

amb

Lo = 1000 mH

Special Conditions for Safe Use (x):

1. Provisions shall be made, external to the apparatus to prevent the rated voltage (42.4 Vdc) from being exceeded by transient disturbances of more than 40%.

2. The ambient temperature range of use shall be the most restrictive of the apparatus, cable gland, or blanking plug.

NOTE:

NE is valid with S001 Input Type ONLY

N1 ATEX Type n

Certification Number: Baseefa09ATEX0095X ATEX Marking II 3 G Ex nL IIC T5 (T

= –40 to 65 °C)

amb

Table B-10. Entity Parameters

Power/Bus Sensor

Ui = 42.4 Vdc Uo = 12.5 Vdc Ci = 0 Io = 4.8 mA Li = 0 Po = 15 mW

Co = 1.2 F Lo = 1 H

B-5

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Special Conditions for Safe Use (x):

1. Provisions shall be made, external to the apparatus, to prevent the rated voltage of the apparatus supply is not exceeded by transient disturbances of more than 40%

2. The electrical circuit is connected directly to earth; this must be taken into account when installing the apparatus.

NC ATEX Type n Component

Certification Number: Baseefa09ATEX0094U ATEX Marking II 3 G Ex nA nL IIC T4 (T Ex nA nL IIC T5 (T

Special Conditions for Safe Use (x):

1. The component must be housed in a suitable certified enclosure that provides a degree of protection of at least IP 54 and me ets the relevant material and environmental requireme nts of EN 60079-0 , and EN-60079-15.

2. Provisions shall be made, external to the apparatus, to prevent the rated voltage (42.4 VDC) being exceeded by transient disturbances of more than 40%.

3. The electrical circuit is connected directly to earth: this must be taken into account when installing the apparatus.

= –50 to 85 °C)

amb

= –50 to 70 °C)

amb

NOTE

NC is valid with S001 Input Type ONLY

ND ATEX Dust Ignition Proof

Certification Number: BAS01ATEX1315X ATEX Marking II 1 D T90C (T

= – 40 to 65 °C) IP66

amb

Special Conditions for Safe Use (x):

1. The user must ensure that the maximum rated voltage and current (42.4 volts, 22 mA, DC) are not exceeded. All connections to other apparatus or associated apparatus shall have control over this voltage and current equivalent to a category “ib” circuit according to EN50020.

2. Component approved EEx e cable entries must be used which maintain the ingress protection of the enclosure to at least IP66.

3. Any unused cable entry holes must be filled with component approved EEx e blanking plugs.

4. The ambient temperature range of use shall be the most restrictive of the apparatus, cable gland, or blanking plug.

Table B-11. Baseefa Approved Entity Parameters

Power/Bus Sensor Ui = 42.4 V Uo = 5V dc Ci = 0 Io = 2.5 mA Li = 0 Co = 1000 F

Lo = 1 H

B-6

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Special Conditions of Safe Use (x):

1. The component must be housed in a suitable certified enclosure.

2. Provisions shall be made, exter nal to the apparatus, to prevent the rated voltage (42.2 V dc) being exceeded b y transient disturbances of more than 40%.

IECEx Certifications

I7 IECEx Intrinsic Safety

Certificate No.: IECExBAS09.0030X Ex ia IIC T4 (T

Table B-12. IECEx Approved Entity Parameters

Power/Bus Sensor

Ui = 30 V Uo = 12.5 V Ii = 300 mA Io = 4.8 mA Pi = 1.3 W Po = 15 mW Ci = 2.1 F Ci = 1.2 F Li = 0 Li = 1 H

= –50 to 60 °C)

amb

Special Conditions of Safe Use (x):

1. The apparatus must be installed in an enclosure that provides a degree of protection of at least IP20. Non-metallic enclosures must be suitable to prevent electrostatic hazards and light alloy or zirconium enclosures must be protected from impact and friction when installed.

2. The apparatus is not capable of withstanding the 500V isolation test required by IEC 60079-11: 2006 clause 6.3.12. This must be taken into account when installing the apparatus.

IG IECEx FISCO

Certificate No.: IECExBAS09.0030X Ex ia IIC T4 (T

= – 50 to 60 °C)

amb

Table B-13. IECEx Approved Entity Parameters

Power/Bus Sensor

Ui =17.5 Vdc Uo = 12.5 Vdc Ii = 380 mA Io = 4.8 mA Pi = 5.32 W Po = 15 mW Ci = 2.1 F Ci = 1.2 F Li = 0 Li = 1 H

Special Conditions of Safe Use (x):

2. The apparatus is not capable of withstanding the 500V isolation test required by IEC 60079-11: 2006 clause 6.3.12. This must be taken into account when installing the apparatus.

B-7

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

N7 IECEx Type n Approval

Certificate No.” IECExBAS09.0032X Ex Na nL IIC T5 (T

NOTE:

N7 is valid with S001 and S002 Input Types

Table B-14. IECEx Approved Entity Parameters

Power/Bus Sensor Ui = 42.4 Vdc Uo = 5 Vdc Ci = 0 Io = 2.5 mA Li = 0 Co = 1000 F

Special Conditions of Safe Use:

1. The component must be housed in a suitable component certified enclosure that provides a degree of protection of at least IP54 and meets the relevant material and environmental requirements of IEC 60079-0: 2004 & IEC 60079-15: 2005.

2. Provision must be made, external to the component, to ensure the rated voltage of the component supply is not exceeded by transient disturbances of more than 40%.

3. The electrical circuit is connected directly to earth; this must be taken into account when installing the component.

= – 40 to 65 °C)

amb

Lo = 1000 mH

B-8

NJ IECEx Type n COMPONENT Approval

Certification Number: IECExBAS09.0031U EEx nA nL IIC T4 (T EEx nA nL IIC T5 (T

= -50 to 85 °C)

amb

= -50 to 70 °C)

amb

NOTE:

NJ is valid with S001 and S002 Input Types

Table B-15. IECEx Approved Entity Parameters

Power/Bus Sensor Ui = 42.4 Vdc Uo = 5 Vdc Ci = 0 Io = 2.5 mA Li = 0 Co = 1000 F

Lo = 1000 mH

Special Conditions of Safe Use:

2. Provision must be made, external to the component, to ensure the rated voltage of the component supply is not exceeded by transient disturbances of more than 40%.

3. The electrical circuit is connected directly to earth; this must be taken into account when installing the component.

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

China (NEPSI)Certifications

I3 Intrinsic Safety Ex ia IIC T4 Certification Number: GYJ111365X

Special Conditions for Safe Use (x):

2.1. Only when temperature transmitter is installed in IP 20(GB4208-2008) housing, it could be used in hazardous location. The metallic housing should observe the requirements of GB3836.1-2000 Clause 8. The non-metallic housing should observe the requirements of GB3836.1-2000 Clause 7.3. This apparatus is not capable of withstanding the 500V rms insulation test required by Clause 6.4.12 of GB3836.4-2000.

2.2. The ambient temperature range is:

Output T code Ambient temperature

F T4 -50 °C < Ta < + 60 °C

2.3. Parameters: Terminals of power/loop (1-2):

Maximum

Output

F (FISCO) 17.5 380 5.32 2.1 0

Output Voltage:

(V)

F 30 300 1.3 2.1 0

Maximum

Output Current:

(mA)

Maximum

Output Power:

(mW)

Maximum external

Co (F) Lo (H)

parameters:

NOTE

Non-FISCO parameters listed above must be derived from a linear supply with a resistance limited output.

Terminals of sensor:

Maximum

Output Terminals

F 1-8 12.5 4.8 15 1.2 1

Output Voltage:

(V)

Maximum

Output Current:

(mA)

Maximum

Output Power:

(mW)

Maximum external

parameters:

Co (F) Lo (H)

2.4. The product complies to the requirements for FISCO field devices

specified in IEC60079-27: 2008. For the connection of an intrinsically safe circuit in accordance FISCO model, FISCO parameters of this product are as above.

2.5. The product should be used with Ex-certified associated apparatus to

establish explosion protection system that can be used in explosive gas atmospheres. Wiring and terminals should comply with the instruction manual of the product and associated apparatus.

2.6. The cables between this product and associated apparatus should be shielded cables (the cables must have insulated shield). The shielded cable has to be grounded reliably in non-hazardous area.

B-9

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

2.7. End users are not permitted to change any component’s insides, but to settle the problem, in conjunction with manufacturer to avoid damage to the product.

2.8. During installation, use and maintenance of this product, observe following standards:

GB3836.13-1997 "Electrical apparatus for explosive gas atmospheres Part 13: Repair and overhaul for apparatus used in explosive gas atmospheres."

GB3836.15-2000 "Electrical apparatus for explosive gas atmosp heres

Part 15: Electrical installations in hazardous area (other than mines)."

GB3836.16-2006 "Electrical apparatus for explosive gas atmospheres

Part 16: Inspection and maintenance of electrical installation (other than mines)."

GB50257-1996 "Code for construction and acceptance of electric

device for explosion atmospheres and fire hazard electrical equipment installation engineering."

Japanese Certifications

I4 TISS Intrinsic Safety FISCO Type ‘1a’

Ex ia IIC T4 Certification Number: TC19713

H4 TISS Intrinsic Safety FISCO Type ‘1b’

Ex ia IIB T4

Certification Number: TC19714

B-10

Reference Manual

848T without

enclosure

Approved I.S. or

FISCO barrier

848T with enclosure

Non-approved

power supply

848T with enclosure

Non-approved

power supply

848T without enclosure

Approved

non-incendive

power supply

or barrier

Non-approved

power supply

848T with enclosure

Standard cable Division 2 wiring

00809-0100-4697, Rev EA October 2011

INTRINSICALLY SAFE AND NON-INCENDIVE INSTALLATIONS

Rosemount 848T

Zone 2

(category 3)

Approval Division 2 Division 1

Safe Area

Zone 1

(category 2)

GAS INSTALLATIONS

I5, I6, I1, I7, IE, IA

N1, N7

I5, I6, IE

Zone 0

(category 1)

DUST INSTALLATIONS

N5, ND

B-11

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

INSTALLATION DRAWINGS

The installation guidelines presented by the drawings must be followed in order to maintain certified ratings for installed transmitters.

Rosemount Drawing 00848-4404, 3 Sheets Factory Mutual Intrinsic Safety/ FISCO Installation Drawing

Rosemount Drawing 00848-4405, 2 Sheets Canadian Standards Association Intrinsic Safety/FISCO Installation Drawing

B-12

Reference Manual

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

00809-0100-4697, Rev EA October 2011

Figure B-1. FM Intrinsic Safety/ FISCO

Rosemount 848T

B-13

Rosemount 848T

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

Reference Manual

00809-0100-4697, Rev EA

October 2011

B-14

Reference Manual

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

00809-0100-4697, Rev EA October 2011

Rosemount 848T

B-15

Rosemount 848T

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

Figure B-2. CSA Intrinsic Safety/ FISCO

Reference Manual

00809-0100-4697, Rev EA

October 2011

B-16

Reference Manual

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

00809-0100-4697, Rev EA October 2011

Rosemount 848T

B-17

Rosemount 848T

Electronic Master – PRINTED COPIES ARE UNCONTROLLED – Rosemount Proprietary

Reference Manual

00809-0100-4697, Rev EA

October 2011

B-18

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Appendix C FOUNDATION™ fieldbus

Technology

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page C-1

Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-1

Device Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .page C-3

Block Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page C-3

Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . .page C-4

OVERVIEW FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop

communication protocol that interconnects devices such as transmitters, sensors, actuators, and valve controllers. Fieldbus is a Local Area Network (LAN) for instruments that are used in both process and manufacturing automation, having the built-in capability to distribute the control applications across the network. The fieldbus environment is the base level group of digit al networks and the hierarchy of plant networks.

The F

OUNDATION fieldbus retains the desirable features of the 4–20 mA

analog system, including standardized physical interface to the wire, bus-powered devices on a single pair of wires, and intrinsic safety options. It also enables the following capabilities:

• Increased capabilities due to full digital communication.

• Reduced wiring and wire terminations due to multiple devices on one pair of wires.

• Increased supplier selection due to interoperability

• Reduced loading on control room equipment due to the distribution of some control and input/output functions to field devices.

OUNDATION fieldbus devices work together to provide I/O and control for

automated processes and operations. The Fieldbus F framework for describing these systems as a collection of physical devices interconnected by a fieldbus network. One of the ways that the physical devices are used is to perform their portion of the total system operation by implementing one or more function blocks.

OUNDATION provides a

FUNCTION BLOCKS Function blocks perform process control functions, such as analog input (AI)

and analog output (AO) functions as well as proportional-integral-derivative (PID) functions. The standard function blocks provide a common structure for defining function block inputs, outputs, control parameters, events, alarms, and modes, and combining them into a process that can be implemented within a single device or over the fieldbus network. This simplifies the identification of characteristics that are common to function blocks.

www.rosemount.com

Rosemount 848T

Input Events Output Events

Input

Parameter

Linkages

Output Parameter Linkages

Processing

Algorithm

Execution

Control

Input Snap

Status

Output

Snap

Status

Reference Manual

00809-0100-4697, Rev EA

October 2011

The Fieldbus FOUNDATION has established the function blocks by defining a small set of parameters used in all function blocks called universal parameters. The F block classes, such as input, output, control, and calculation blocks. Each of these classes has a small set of parameters established for it. They have also published definitions for transducer blocks commonly used with standard function blocks. Examples include temperature, pressure, level, and flow transducer blocks.

The F

OUNDATION specifications and definitions allow vendors to add their own

parameters by importing and subclassing specified classes. This approach permits extending function block definitions as new requirements are discovered and as technology advances.

Figure C-1 illustrates the internal structure of a function block. When execution begins, input parameter va lues from other blocks are snappe d-in by the block. The input snap process ensures that these values do not change during the block execution. New values received for these parameters do not affect the snapped values and will not be used by the function block during the current execution.

OUNDATION has also defined a standard set of function

Figure C-1. Function Block Internal Structure

Once the inputs are snapped, the algorithm operates on them, generating outputs as it progresses. Algorithm executions are controlled through the setting of contained parameters. Contained parameters are internal to function blocks and do not appear as normal input and output parameters. However, they may be accessed and modified remotely, as specified by the function block.

Input events may affect the operation of the algorith m. An execution control function regulates the receipt of input events and the generation of output events during execution of the algorithm. Upon completion of the algorithm, the data internal to the block is saved for use in the next execution, and the output data is snapped, releasing it for use by other function blocks.

C-2

A block is a tagged logical processing unit. The tag is the name of the block. System management services locate a block by its tag. Thus the service personnel need only know the tag of the block to access or change the appropriate block parameters.

Function blocks are also capable of performing sho rt-term dat a collection an d storage for reviewing their behavior.

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

DEVICE DESCRIPTIONS Device Descriptio ns (D D) ar e specified tool definitions that are associated

with the Resource and Transducer Blocks. Device descriptions provide the definition and description of the function blocks and their parameters.

To promote consistency of definition and understanding, descriptive information, such as data type and length, is maintained in the device description. Device Descriptions are written using an open language called the Device Description Language (DDL). Param e te r tra ns fe rs between function blocks can be easily verified because all parameters are described using the same language. Once written, the device description can be stored on an external medium, such as a CD-ROM or diskette. Users can then read the device description from the external me diu m . Th e us e of an op en language in the device description permits interoperability of function blocks within devices from various vendors. Additionally, human interface devices, such as operator consoles and computers, do not have to be programmed specifically for each type of device on the bus. Instead their displays and interactions with devices are driven from the device descriptions.

Device descriptions may also include a set of processing routines called methods. Methods provide a procedure for accessing and manipulating parameters within a device.

BLOCK OPERATION In addition to function blocks, fieldbus devices contain two other block types

to support the function blocks. These are the resource block and the transducer block.

Instrument- Specific Function Blocks

Resource Blocks

Resource blocks contain the hardware–specific characteristics associated with a device; they have no input or output parameter s. The algorithm within a resource block monitors and controls the general operation of the physical device hardware. The execution of this algorithm is dependent on the characteristics of the physical device, as defi ne d by the m anuf acturer. As a result, the algorithm may cause the generation of events. There is only one resource block defined for a device. For example, when the mode of a resource block is “Out of Service (OOS),” it impacts all of the other blocks.

Transducer Blocks

Transducer blocks connect function blocks to local input/output functions. They read sensor hardware and write to effector (actuator) hardware. This permits the transducer block to execute as frequently as necessary to obtain good data from sensors and ensure proper writes to the actuator without burdening the function blocks that use the data. The transducer block also isolates the function block from the vendor–specific characteristics of the physical I/O.

Alerts When an alert occurs, execution control sends an event notification and waits

a specified period of time for an acknowledgment to be received. This occurs even if the condition that caused the alert no longer exists. If the acknowledgment is not received within the pre-specified time-out period, the event notification is retransmitted, assuring that alert messages are not lost.

C-3

Rosemount 848T

LAS

Basic Devices and/or link master devices

Link Master

Fieldbus Link

Reference Manual

00809-0100-4697, Rev EA

October 2011

Two types of alerts are defined for the block: events and alarms. Events are used to report a status change when a block leaves a p articular state, su ch as when a parameter crosses a threshold. Alarms not only report a status change when a block leaves a particular state, but also report when it returns back to that state.

NETWORK COMMUNICATION

Figure C-2. Simple, Single-Link Fieldbus Network

Link Active Scheduler (LAS)

Figure C-2 illustrates a simple fieldbus network consisting of a single segment (link).

All links have one Link Active Scheduler (LAS). The LAS operates as the bus arbiter for the link. The LAS does the following:

• recognizes and adds new devices to the link.

• removes non-responsive devices from the link.

• distributes Data Link Time (DL) and Link Scheduling Time (LS) on the link. DL is a network-wide time periodically distributed by the LAS to synchronize all device clocks on the bus. LS time is a link-specific time represented as an offset from DL. It is used to indicate when the LAS on each link begins and repeats its schedule. It is used by system management to synchronize function block execution with the data transfers scheduled by the LAS.

• polls devices for process loop data at scheduled transmission times.

• distributes a priority-driven token to devices between scheduled transmissions.

C-4

Any device on the link may become the LAS. The devices that are capable of becoming the LAS are called Link Master devices (LM). All other devices are referred to as basic devices. When a segment first starts up, or upon failure of the existing LAS, the link master devices on the segment bid to become the LAS. The link master that wins the bid begins operating as the LAS immediately upon completion of the bidding process. Link masters that do not become the LAS act as basic devices. However, the link masters can act as LAS backups by monitoring the link for failure of the LAS and then bidding to become the LAS when a LAS failure is detected.

Only one device can communicate at a time. Permission to communicate on the bus is controlled by a centralized token passed between devices by the LAS. Only the device with the token can communicate. The LAS maintains a list of all devices that need access to the bus. This list is called the “Live List.”

Two types of tokens are used by the LAS. A time-critical token, Compel Data (CD), is sent by the LAS according to a schedule. A non-time critical token, pass token (PT), is sent by the LAS to each device in ascending numerical order according to address.

Reference Manual

FB 1

C D

Data

FB 2

MID

MID x ST

MID

00809-0100-4697, Rev EA October 2011

Rosemount 848T

There may be many LM devices on a segment but only the LAS is actively controlling communication traffic. The remaining LM devices on the segment are in a stand-by state, ready to take over if the primary LAS fails. This is achieved by constantly monitoring the communication traffic on the bus and determining if activity is not present. Since there can be multiple LM devices on the segment when the primary LAS fails, the device with the lowest node address will become the primary LAS and take control of the bus. Using this strategy, multiple LAS failures can be handled with no loss of the LAS capability of the communications bus.

LAS Parameters

There are many bus communication parameters but on ly a few are used. For standard RS-232 communications, the configuration p arameters are baud rate, start / stop bits, and parity. The key parameters for H1 F fieldbus are as follows.

• Slot Time (ST) – Used during the bus master el ection process. It is the maximum amount of time permitted for device A to send a message to device B. Slot time is a parameter which defines a worst case delay which includes internal delay in the sending device and the receiving device. Increasing the value of ST slows down bus traffic because a LAS device must wait longer prior to determining that the LM is down.

• Minimum Inter-PDU Delay (MID) – The minimum gap between two messages on the fieldbus segment or it is the amount of time between the last byte of one message and the first byte of the next message. The units of the MID are octets. An octet is 256 s, hence the units for MID are approximately

/4 ms. This would mean an MID of 16 would specify approximately a minimum of 4 ms between messages on the Fieldbus. Increasing the value of MID slows down bus traf fic because a larger “gap” between messages occurs.

• Maximum Response (MRD) – Defines the maximum amount of time permitted to respond to an immediate response request, e.g. CD, PT. When a published value is requested using the CD command, the MRD defines how long before the device publishes the data. Increasing this parameter will slow down the bus traffic by decreasing how fast CDs can be put onto the network. The MRD is measured in units of ST.

• Time Synchronization Class (TSC) – A variable that de fines how long the device can estimate its time before drifting out of specific limits. The LM will periodically send out time update messages to synchronize devices on the segment. Decreasing the parameter number increases the number of times that time distribution messages must be published, increasing bus traffic and overhead for the LM device. See Figure C-3.

OUNDATION

Figure C-3. LAS Parameter diagram

C-5

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Backup LAS

A LM device is one that has the ability to control the communications on the bus. The LAS is the LM capable device that is currently in control of the bus. While there can be many LM devices acting as backups, there can only be one LAS. The LAS is typically a host system but for stand-alone applicatio ns, a device may be providing the role of primary LAS.

October 2011

Addressing To setup, configure, and communicate with other devices on a segment, a

device must be assigned a permanent address. Unless requested otherwise, it is assigned a temporary address when shipped from the factory.

OUNDATION fieldbus uses addresses between 0 and 255. Addresses 0

through 15 are reserved for group addressing and for use by the data link layer.

If there are two or more devices on a segment with the same address, the first device to start up will use the assigned address. Each of the other devices will be given one of the four temporary addresses. If a temporary address is not available, the device will be unavailable until a temporary address is available.

Use the host system documentation to commission a device and assign a permanent address.

Scheduled Transfers Information is transferred between devices over the FOUNDATION fieldbus

using three different types of reporting.

Publisher/Subscriber

This type of reporting is used to transfer critical process loop data, such as the process variable. The data producers (publishers) post the dat a in a buffer that is transmitted to the subscriber, when the publisher receives the Compel Data (CD). The buffer contains only one copy of the data. New data completely overwrites previous data. Updates to published data are transferred simultaneously to all subscribers in a single broadcast. Transfers of this type can be scheduled on a precisely periodic basis.

Report Distribution

This type of reporting is used to broadcast and multicast event and trend reports. The destination address may be predefined so that all reports are sent to the same address, or it may be provided separately with each report. Transfers of this type are queued. They are delivered to the receivers in the order transmitted, although there may be gaps due to corrupted transfers. These transfers are unscheduled and occur between scheduled transfer s at a given priority.

Client/Server

This type of reporting is used for request/response exchanges between pairs of devices. Like Report Distribution reporting, the transfers are queued, unscheduled, and prioritized. Queued means the messages are sent and received in the order submitted for transmission, according to their priority, without overwriting previous messages. However, unlike Report Distribution, these transfers are flow controlled and employ a retransmission procedure to recover from corrupted transfers.

C-6

Reference Manual

Schedule

X, Y, Z

CD(X,A)

DT(A)

Device X

Device Y Device Z

ACDAB PS PS PAS

LAS

Schedule

X, Y, Z

PT(Z)

Device X Device Y Device Z

ACDAB

PS PS PAS

LAS

DT(M)

00809-0100-4697, Rev EA October 2011

Figure C-4. Scheduled Data Transfer

Rosemount 848T

Figure C-4 diagrams the method of scheduled data transfer. Scheduled data transfers are typically used for the regular cyclic transfer of process loop data between devices on the fieldbus. Scheduled transfers use publisher/ subscriber type of reporting for data transfer. The LAS maintains a list of transmit times for all publishers in all devices that need to be cyclically transmitted. When it is time for a device to publish data, the LAS issues a CD message to the device. Upon receipt of the CD, the device broadcasts or “publishes” the data to all devices on the fieldbus. Any device that is configured to receive the data is called a “subscriber.”

LAS = Link Active Scheduler P = Publisher S = Subscriber CD = Compel Data DT = Data Transfer Packet

Unscheduled Transfers Figure C-5 diagrams an unscheduled transfer. Unscheduled transfers are

used for things like user-initiated changes, including set point changes, mode changes, tuning changes, and upload /d ow nlo ad . Un sch ed u led tra ns fer s use either report distribution or client/server type of reporting for transferring data.

All of the devices on the F unscheduled messages between transmissions of scheduled data. The LAS grants permission to a device to use t he fieldbu s by issuing a p ass to ken (PT) message to the device. When the device receives the PT, it is allowed to send messages until it has finished or until the “maximum token hold time” has expired, whichever is the shorter time. The message may be sent to a single destination or to multiple destinations.

Figure C-5. Unscheduled Data Transfer

OUNDATION fieldbus are given a chance to send

P = Publisher S = Subscriber PT = Pass Token M = Message

C-7

Rosemount 848T

Macrocycle Start Time

Offset from macrocycle start time = 0 for AI Execution

Device 1

Scheduled

Communication

Sequence

Repeats

Macrocycle

Offset from macrocycle start time = 20 for AI Communication

Unscheduled

Communication

Device 2

Offset from macrocycle start time = 30 for PID Execution

Offset from macrocycle start time = 50 for AO Execution

PID

Reference Manual

00809-0100-4697, Rev EA

October 2011

Function Block Scheduling

Figure C-6. Example Link Schedule Showing Scheduled and Unscheduled Communication

Figure C-6 shows an example of a link schedule. A single iteration of the link-wide schedule is called the macrocycle. When the system is configured and the function blocks are linked, a master link-wide schedule is created for the LAS. Each device maintains its portion of the link-wide schedule, known as the Function Block Schedule. The Function Block Schedule indicates when the function blocks for the device are to be executed. The scheduled execution time for each function block is represented as an offset from the beginning of the macrocycle start time.

C-8

To support synchronization of schedules, periodically Link Scheduling (LS) time is distributed. The beginning of the macrocycle represents a common starting time for all Function Block schedules on a link and for the LAS link-wide schedule. This permits function block executions and their corresponding data transfers to be synchronized in time.

Reference Manual

OUT_D

OUT

00809-0100-4697, Rev EA October 2011

Appendix D Function Blocks

Analog Input (AI) Function Block . . . . . . . . . . . . . . . . . . . page D-1

Multiple Analog Input (MAI) Function Block . . . . . . . . . .page D-9

Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . page D-15

Rosemount 848T

ANALOG INPUT (AI) FUNCTION BLOCK

The Analog Input (AI) function block processes field device measurements and makes them available to other function blocks. The output value from the AI block is in engineering units and contains a status indicating the quality of the measurement. The measuring device may have several measurements or derived values available in different channels. Use the chann el number to define the variable that the AI block processes.

The AI block supports alarming, signal scaling, signal filtering, signal status calculation, mode control, and simulation. In Automatic mode, the block’s output parameter (OUT) reflects the process variable (PV) value and status. In Manual mode, OUT may be set manually. The Manual mode is reflected on

Out = The block output value and status Out_D = Discrete output that signals a selected alarm condition

the output status. A discrete output (OUT_D) is prov ided to indicate whether a selected alarm condition is active. Alarm detection is based on the OUT value and user specified alarm limits. The block execution time is 30 ms.

Table D-1. Analog Input Function Block Parameters

Number Parameter Units Description

01 ST_REV None The revision level of the static data associated with the function block. The

02 TAG_DESC None The user description of the intended application of the block. 03 STRATEGY None The strategy field can be used to identify a grouping of blocks. This data is not

04 ALERT_KEY None The identification number of the plant unit. This information may be used in the host

05 MODE_BLK None The actual, target, permitted, and normal modes of the block.

06 BLOCK_ERR None This parameter reflects the error status associated with the hardware or software

07 PV EU of XD_SCALE The process variable used in block execution. 08 OUT EU of OUT_SCALE

or XD_SCALE if in

direct L_TYPE

09 SIMULATE None A group of data that contains the current transducer value and status, the simulated

revision value will be incremented each time a static parameter value in the block is changed.

checked or processed by the block.

for sorting alarms, etc.

Actual: The mode the “block is currently in” Target: The mode to “go to” Permitted: Allowed modes that target may take on Normal: Most common mode for target

components associated with a block. It is a bit string, so that multiple errors may be shown.

The block output value and status.

transducer value and status, and the enable/disable bit.

www.rosemount.com

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Table D-1. Analog Input Function Block Parameters

Number Parameter Units Description

10 XD_SCALE None The high and low scale values, engineering units code, and number of digits to

the right of the decimal point associated with the channel input value. The XD_SCALE units code must match the units code of the measurement channel in the transducer block. If the units do not match, the block will not transition to MAN or AUTO.

11 OUT_SCALE None The high and low scale values, engineering units code, and number of digits to the

right of the decimal point associated with OUT when L_TYPE is not direct.

12 GRANT_DENY None Options for controlling access of host computers and local control panels to

operating, tuning, and alarm parameters of the block. Not used by device.

13 IO_OPTS None Allows the selection of input/output options used to alter the PV. Low cutoff enabled

is the only selectable option.

14 STATUS_OPTS None Allows the user to select options for status handling and processing. The options

supported in the AI block are the following: Propagate fault forward Uncertain if limited Bad if limited Uncertain if Manual mode.

15 CHANNEL None The CHANNEL value is used to select the measurement value. Configure the

CHANNEL parameter before configuring the XD_SCALE parameter. Refer to Table 3-5 on page 3-11.

16 L_TYPE None Linearization type. Determines whether the field value is used directly (Direct), is

converted linearly (Indirect), or is converted with the square root (Indirect Square

Root). 17 LOW_CUT % If percentage value of transducer input fails below this, PV = 0. 18 PV_FTIME Seconds The time constant of the first-order PV filter. It is the time required for a 63% change

in the PV or OUT value. 19 FIELD_VAL Percent The value and status from the transducer block or from the simulated input when

simulation is enabled. 20 UPDATE_EVT None This alert is generated by any change to the static data. 21 BLOCK_ALM None The block alarm is used for all configuration, hardware, connection failure or system

problems in the block. The cause of the alert is entered in the subcode field. The first

alert to become active will set the Active status in the Status parameter. As soon as

the Unreported status is cleared by the alert reporting task, another block alert may

be reported without clearing the Active status, if the subcode has changed. 22 ALARM_SUM None The summary alarm is used for all process alarms in the block. The cause of the

alert is entered in the subcode field. The first alert to become active will set the

Active status in the Status parameter. As soon as the Unreported status is cleared

by the alert reporting task, another block alert may be reported without clearing the

Active status, if the subcode has changed. 23 ACK_OPTION None Used to set auto acknowledgment of alarms. 24 ALARM_HYS Percent The amount the alarm value must return within the alarm limit before the associated

active alarm condition clears. 25 HI_HI_PRI None The priority of the HI HI alarm. 26 HI_HI_LIM EU of PV_SCALE The setting for the alarm limit used to detect the HI HI alarm condition. 27 HI_PRI None The priority of the HI alarm. 28 HI_LIM EU of PV_SCALE The setting for the alarm limit used to detect the HI alarm condition. 29 LO_PRI None The priority of the LO alarm. 30 LO_LIM EU of PV_SCALE The setting for the alarm limit used to detect the LO alarm condition. 31 LO_LO_PRI None The priority of the LO LO alarm. 32 LO_LO_LIM EU of PV_SCALE The setting for the alarm limit used to detect the LO LO alarm condition. 33 HI_HI_ALM None The HI HI alarm data, which includes a value of the alarm, a timestamp of

occurrence and the state of the alarm. 34 HI_ALM None The HI alarm data, which includes a value of the alarm, a timestamp of occurrence

and the state of the alarm. 35 LO_ALM None The LO alarm data, which includes a value of the alarm, a timestamp of occurrence

and the state of the alarm.

October 2011

D-2

Reference Manual

PV_FTIME

63% of Change

OUT (mode in man)

OUT (mode in auto)

Time (seconds)

FIELD_VAL

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Table D-1. Analog Input Function Block Parameters

Number Parameter Units Description

36 LO_LO_ALM None The LO LO alarm data, which includes a value of the alarm, a timestamp of

occurrence and the state of the alarm. 37 OUT_D None Discrete output to indicate a selected alarm condition. 38 ALM_SEL None Used to select the process alarm conditions that will cause the OUT_D parameter to

be set. 39 STDDEV % of OUT Range Standard deviation of the measurement for 100 macrocycles. 40 CAP_STDDEV % of OUT Range Capability standard deviation, the best deviation that can be achieved.

Functionality Simulation

To support testing, either change the mode of the block to manual and adjust the output value, or enable simulation through the configuration tool and manually enter a value for the measurement value and its status. In simulation, the ENABLE jumper must be set on the field device.

NOTE

All F

OUNDATION fieldbus instruments have a simulation jumper. As a safety

measure, the jumper has to be reset every time there is a power interruption. This measure is to prevent devices that went through simulation in the staging process from being installed with simulation enabled.

Figure D-1. Analog Input Function Block Timing Diagram

With simulation enabled, the actual measurement value has no impact on the OUT value or the status.

D-3

Rosemount 848T

Analog

Measurement

Access Analog

Meas.

CHANNEL

SIMULATE

OUT_SCALE

XD_SCALE

FIELD_VAL

L_TYPE

IO_OPTS

PV_FTIME

MODE

STATUS_OPTS

HI_HI_LIM

HI_LIM

LO_LO_LIM

LO_LIM

ALARM_HYS

ALM_SEL

OUT_D

OUT

Convert

Cutoff Filter

Status

Calc.

Alarm

Detection

LOW_CUT

FIELD_VAL

100 Channel Value EU*@0%–

EU*@100% EU*@0%–

------------------------------------------------------------------------------------------- -=

* XD_SCALE values

PV Channel Value=

FIELD_VAL

100

-------------------------------





EU**@100% EU**@0%–EU**@0%+=

** OUT_SCALE values

Figure D-2. Analog Input Function Block Schematic

Reference Manual

00809-0100-4697, Rev EA

October 2011

OUT = Block output value and status OUT_D = Discrete output that signals a selected alarm condition

Filtering

The filtering feature changes the response time of the device to smooth variations in output readings caused by rapid changes in input. Adjust the filter time constant (in seconds) using the PV_FTIME parameter. Set the filter time constant to zero to disable the filter feature.

Signal Conversion

Set the signal conversion type with the Linearization Type (L_TYPE) parameter. View the converted signal (in percent of XD_SCALE) through the FIELD_VAL parameter.

Choose from direct, indirect, or indirect square root signal conversion with the L_TYPE parameter.

Direct

Direct signal conversion allows the signal to pass through the accessed channel input value (or the simulated value when simulation is enabled).

Indirect

D-4

Indirect signal conversion converts the signal linearly to the accessed channel input value (or the simulated value when simulation is enabled) from its specified range (XD_SCALE) to the range an d un its of the PV and OUT parameters (OUT_SCALE).

Reference Manual

FIELD_VAL

100

-------------------------------





EU**@100% EU**@0%–EU**@0%+=

** OUT_SCALE values

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Indirect Square Root

Indirect Square Root signal conversion takes the square root of the value computed with the indirect signal conversion and scales it to the range and units of the PV and OUT parameters.

When the converted input value is below the limit specified by the LOW_CUT parameter, and the Low Cutoff I/O option (IO_OPTS) is enabled (True), a value of zero is used for the converted value (PV). This optio n eliminates false readings when the differential pressure measurement is close to zero and it may be useful with zero-based measurement devices such as flowmeters.

NOTE Low Cutoff is the only I/O option supported by the AI block. Set the I/ O option

when the block is OOS.

Block Errors

Table D-2. BLOCK_ERR Conditions

Table D-2 lists conditions reported in the BLOCK_ERR parameter. Conditions in bold are inactive for the AI block and are given here for reference.

Number Name and Description

0 Other 1 Block Configuration Error: the selected channel carr ies a measurement that is

incompatible with the engineering units selected in XD_SCALE, the L_TYPE parameter is not configured, or CHANNEL = zero.

2 Link Configuration Error

3 Simulate Active: Simulation is enabled and the block is using a simulated value in

its execution.

4 Local Override 5 Device Fault State Set 6 Device Needs Maintenance Soon

7 Input Failure/Process Variable has Bad Status: The hardware is bad, or a bad

status is being simulated.

8 Output Failure: The output is bad based primarily upon a bad input.

9 Memory Failure 10 Lost Static Data 11 Lost NV Data 12 Readback Check Failed 13 Device Needs Maintenance Now

14 Power Up 15 Out of Service: The actual mode is out of service.

D-5

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Modes

The AI Function Block supports three modes of operation as defined by the MODE_BLK parameter:

Manual (Man)

The value of the block output (OUT) may be set manually

Automatic (Auto)

OUT reflects the analog input measurement or the simulated value when simulation is enabled.

Out of Service (OOS)

The block is not processed. FIELD_VAL and PV are not updated and the OUT status is set to Bad: Out of Service. The BLOCK_ERR parameter shows Out of Service. In this mode, changes can be made to all configurable parameters.

Alarm Detection

A block alarm will be generated whenever the BLOCK_ERR has an error bit set. The types of block error for the AI block are defined above.

Table D-3. Alarm Priority Levels

Process Alarm detection is based on the OUT value. Configure the alarm limits of the following standard alarms:

• High (HI_LIM)

• High high (HI_HI_LIM)

• Low (LO_LIM)

• Low low (LO_LO_LIM)

To avoid alarm chatter when the variable is oscillating around the alarm limit, an alarm hysteresis in percent of the PV span can be set using the ALARM_HYS parameter. The priority of each alarm is set in the following parameters:

•HI_PRI

•HI_HI_PRI

•LO_PRI

•LO_LO_PRI

Number Description

0 The priority of an alarm condition changes to 0 after the condition that caused the

alarm is corrected.

1 An alarm condition with a priority of 1 is recognized by the system, but is not

reported to the operator.

2 An alarm condition with a priority of 2 is reported to the operator, but does not

require operator attention (such as diagnostics and system alerts).

3-7 Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.

8-15 Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.

D-6

Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Status Handling

Normally, the status of the PV reflects the status of the measurement value, the operating condition of the I/O card, and any active alarm condition. In Auto mode, OUT reflects the value and status quality of the PV. In Man mode, the OUT status constant limit is set to indicate that th e value is a const ant and the OUT status is Good.

If the sensor limit exceeds the high or low range, PV status is set high or low and EU range status is set to uncertain.

In the STATUS_OPTS parameter, select from the following options to control the status handling:

BAD if Limited

Sets the OUT status quality to Bad when the value is higher or lower than the sensor limits.

Uncertain if Limited

Sets the OUT status quality to Uncertain when the value is hig her or lower than the sensor limits.

Uncertain if in Manual mode

The status of the Output is set to Uncertain when the mode is set to Manual

NOTES

1. The instrument must be in OOS mode to set the status option.

2. The AI block only supports the BAD if Limited option, uncertain if limited, and uncertain if manual.

Advanced Features

The AI function block provided with Rosemount fieldbus devices provides added capability through the addition of the following parameters:

ALARM_TYPE

Allows one or more of the process alarm conditions detected by the AI function block to be used in setting its OUT_D parameter.

OUT_D

Discrete output of the AI function block based on the detection of process alarm condition(s). This parameter may be linked to other function blocks that require a discrete input based on the detected alarm condition.

STD_DEV and CAP_STDDEV

Diagnostic parameters that can be used to determine the variability of the process.

D-7

Rosemount 848T

Reference Manual

00809-0100-4697, Rev EA

October 2011

Application Information

The configuration of the AI function block and its associated output channels depends on the specific application. A typical configuration for the AI block involves the following parameters:

CHANNEL

The device supports more than one measurement, so verify that the selected channel contains the appropriate measureme nt or derived value. Refer to Table 3-5 on page 3-11 for a listing of available channels on the 848T.

L_TYPE

Select Direct when the measurement is in the desired engineering units for the block output. Select Indirect when converting the measured variable into another, for example, pressure into level or flow into energy.

SCALING

XD_SCALE provides the range and units of the measurement and OUT_SCALE provides the range and engineering units of the output. OUT_SCALE is only used when in indirect or indirect square root.

AI Block Troubleshooting

Symptom Possible Causes Corrective Action

Mode will not leave OOS Target mode not set. Set target mode to something other than OOS.

Process and/or block alarms will not work.

Value of output does not make sense

Cannot set HI_LIMIT, HI_HI_LIMIT, LO_LIMIT, or LO_LO_LIMIT Values

Configuration error BLOCK_ERR will show the configuration error bit set. The following are parameters that

Resource block The actual mode of the Resource block is OOS. See Resource Block Diagnostics for

Schedule Block is not scheduled and therefore cannot execute to go to Target Mode. Typically,

Features FEATURES_SEL does not have Alerts enabled. Enable the Alerts bit. Notification LIM_NOTIFY is not high enough. Set equal to MAX_NOTIF Y. Alarm not linked to host. Status Options ST ATUS_OPTS has Propagate Fault Forward bit set. This should be cleared to cause an

Linearization Type L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left at

Scaling Scaling parameters are set incorrectly:

Scaling L imit values are outside the OUT_SCALE.EU0 and OUT_SCALE.EU100 values.

must be set before the block is allowed out of OOS:

• CHANNEL must be set to a valid value and cannot be left at initial value of 0.

• XD_SCALE channel value. Setting the units in the AI block automatically sets them in the XD_BLOCK.

• L_TYPE must be set to Direct, Indirect, or Indirect Square Root and cannot be left at initial value of 0.

corrective action.

BLOCK_ERR will show “Power-Up” for all blocks that are not scheduled. Schedule the block to execute.

alarm to occur.

initial value of 0.

• XD_SCALE.EU0 and EU100 should match that of the transducer block channel value.

• OUT_SCALE

• Both STB on each asic used must by in auto.

Change OUT_SCALE or set values within range.

.UNITS_INDEX must match the units in the transducer block

.EU0 and EU100 are not set properly.

D-8

Reference Manual

OUT_1

MAI

OUT_2 OUT_3

OUT_4 OUT_5 OUT_6 OUT_7 OUT_8

00809-0100-4697, Rev EA October 2011

Rosemount 848T

MULTIPLE ANALOG INPUT (MAI) FUNCTION BLOCK

The Multiple Analog Input (MAI) function block has the ability to process up to eight field device measurements and make them available to other function blocks. The output values from the MAI block are in engineering units and contain a status indicating the quality of the measurement. The measuring device may have several measurements or derived values available in different channels. Use the channel numbers to define the variables that the MAI block processes.

The MAI block supports signal scaling, signal filtering, signal status calculation, mode control, and simulation. In Automatic mode, the block’s output parameters (OUT_1 to OUT_8) reflects the process variable (PV) values and status. In Manual mode, OUT may be set manually. The Manual mode is reflected on the output status. Table D-4 lists the MAI block parameters and their unit s of measur e, d escription s, and indexnumbers. The block execution time is 30 ms.

Out1 = The block output value and status for the first channel.

Table D-4. Multiple Analog Input Function Block Parameters

Number Parameter Units Description

1 ST_REV None The revision level of the static data associated with the input selector block. The

2 TAG_DESC None The user description of the intended application of the block. 3 STRATEGY None The strategy field can be used to identify grouping of blocks. This data is not

4 ALERT_KEY None The identification number of the plant unit. This information may be used in the host

5 MODE_BLK None The actual, target, permitted, and normal modes of the block.

6 BLOCK_ERR None This parameter reflects the error status associated with the hardware or software

7 CHANNEL None Allows for custom channel setting. Valid values include:

8, 9, 10, 11,

12, 13, 14,

15 16 UPDATE_EVT None This alert is generated by any change to the static data 17 BLOCK_ALM None The block alarm is used for all configuration, hardware connection feature, or

18 SIMULATE None A group of data that contains the current sensor transducer value and status, and

OUT (1, 2, 3, 4, 5, 6, 7, 8)

EU of OUT_SCALE The block output value and status

revision value will be incremented each time a static parameter value in the block is changed.

checked or processed by the block.

for sorting alarms, etc.

Actual: The mode the “block is currently in” Target: The mode to “go to” Permitted: Allowed modes that target may take on Normal: Most common mode for target

components associated with a block. It is a bit string, so that multiple errors may be shown.

0: Unitialized 1: Channels 1 to 8 (index values 27 to 34 can only be set to their corresponding channel number, i.e. CHANNEL_X=X) 2: Custom settings (index values 27 to 34 can be configured for any valid channel as defined by the DD)

system problems in the block. The cause of the alert is entered in the subcode field. The first alert to become active will set the Active status in the Status parameter. As soon as the Unreported status is cleared by the alert reporting task, another block may be reported without clearing the Active status, if the subcode has changed.

the enable/disable bit.

D-9

Reference Manual

00809-0100-4697, Rev EA

Rosemount 848T

Table D-4. Multiple Analog Input Function Block Parameters

Number Parameter Units Description

19 XD_SCALE None The high and low scale values, engineering units code and number of digits to the

right of the decimal point associated with the channel input value. The XD_SCALE units code must match the units code of the measurement channel in the transducer block. If the units do not match, the block will not transition to MAN or AUTO. It will automatically change units in the STB block to the last one written. Multiple blocks reading the same channel may conflict (only one unit type per channel).

20 OUT_SCALE None The high and low scale values, engineering unit code and number of digits to the

21 GRANT_DENY None Options for controlling access of host computers and local control panels for

22 IO_OPTS None Allows the selection of input/output options used to alter the PV . Low cutof f enabled

23 STATUS_OPTS None Allows the user to select options for status handling and processing. The options

24 L_TYPE None Linearization type. Determines whether the field value is uses directly (Direct), is

25 LOW_CUT % If percentage value of the sensor transducer input falls below this, PV = 0 26 PV_FTIME Seconds The time constant of the first-order PV filter. It is the time required for a 63% change

27, 28, 29, 30, 31, 32,

33, 34

35, 36, 37, 38, 39, 40,

41, 42

43, 44, 45, 46, 47, 48,

49, 50

CHANNEL_(1, 2, 3,4 5, 6, 7, 8)

STDDEV_(1, 2, 3, 4, 5, 6, 7, 8)

CAP_STDDEV_(1 , 2, 3, 4, 5, 6, 7, 8)

None The CHANNEL (1, 2, 3, 4, 5, 6, 7, 8) value is used to select the measurement

% of OUT Range Standard deviation of the corresponding measurement.

% of OUT Range Capability standard deviation, the best deviation that can be achieved.

right of the decimal point associated with OUT.

operating, tuning, and alarm parameters of the block. Not used by device.

is the only selectable option.

supported in the MAI block are the following:

• Propagate fault forward

• Uncertain if limited

• Bad if limited

• Uncertain if manual mode

converted linearly (Indirect), or is converted with the square root (Indirect Square Root)

in the IN value.

value. See T able D-4 on page D-6 for available channels. Configure the CHANNEL parameters to custom (2) before configuring the CHANNEL parameters.

October 2011

Functionality Simulation

To support testing, either change the mode of the block to manual and adjust the output value or enable simulation through the configuration tool and manually enter a value for the measurement value and its status (this single value will apply to all outputs). In both cases, first set the ENABLE jumper on the field device.

NOTE

All F

OUNDATION fieldbus instruments have a simulation jumper. As a safety

With simulation enabled, the actual measurement value has no impact on the OUT value or the status. The OUT values will all have the same value as determined by the simulate value.

D-10

Emerson 848T User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Section 1 Introduction

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

• Overview

SERVICE SUPPORT To expedite the return process in North America, call the Emerson Process

Section 2 Installation

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

MOUNTING The 848T is always mounted remote from the sensor assembly. There are

WIRING If the sensor is installed in a high-volt age environ ment and a fault conditio n or

GROUNDING The 848T transmitter provides input/output isolation up to 620 V rms.

SWITCHES

TAGGING Commissioning Tag

Section 3 Configuration

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

COMMON CONFIGURATIONS FOR HIGH DENSITY APPLICATIONS

BLOCK CONFIGURATION

Section 4 Operation and Maintenance

SAFETY MESSAGES Instructions and procedures in this section may require special precautions to

FOUNDATION FIELDBUS INFORMATION

HARDWARE MAINTENANCE

Appendix A Reference Data

FUNCTIONAL SPECIFICATIONS

PHYSICAL SPECIFICATIONS

FUNCTION BLOCKS

PERFORMANCE SPECIFICATIONS

DIMENSIONAL DRAWINGS

ORDERING INFORMATION

Appendix B Product Certificates

HAZARDOUS LOCATIONS CERTIFICATES

INTRINSICALLY SAFE AND NON-INCENDIVE INSTALLATIONS

INSTALLATION DRAWINGS

OVERVIEW FOUNDATION fieldbus is an all-digital, serial, two-way, multidrop

FUNCTION BLOCKS Function blocks perform process control functions, such as analog input (AI)

DEVICE DESCRIPTIONS Device Descriptio ns (D D) ar e specified tool definitions that are associated

BLOCK OPERATION In addition to function blocks, fieldbus devices contain two other block types

NETWORK COMMUNICATION

Appendix D Function Blocks

ANALOG INPUT (AI) FUNCTION BLOCK

MULTIPLE ANALOG INPUT (MAI) FUNCTION BLOCK