Emerson 848T User Manual
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
F
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
Table of Contents
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
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.
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
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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
1
/4-20 x 1.25-in. screws.
When inside of a stainless steel junction box, the 848T mounts to a panel
using two
1
/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)
(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
Analog Device
Power Supply
4-20 mA loop
FOUNDATION
fieldbus bus
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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
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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
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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
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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
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
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)
(1)
(1)
(1)
(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
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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.
1
/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
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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.
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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
Out_D
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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
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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.
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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.
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.
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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
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