Yokogawa DO202 User Manual

User’s Manual

EXA 202

Fieldbus Communication

IM 12A00A01-61E

2nd Edition

TABLE OF CONTENTS

1. INTrOduCTION .................................................................................................. 1-1

2. SAFETy PrECAuTIONS .................................................................................... 2-1

3. FOuNdATION FIELdBuS ..................................................................................3-1

3-1 About Foundation Fieldbus ..............................................................................3-1

3-1-1 Outline ..............................................................................................................................3-1

3-1-2 Internal Structure of EXA ..................................................................................................3-1

3-1-2-1 System/network Management VFD ....................................................................3-1

3-1-2-2 Function Block VFD ............................................................................................3-1

3-1-3 Logical Structure of Each Block .......................................................................................3-1

3-1-4 Wiring System Configuration ............................................................................................3-2

3-2 Getting started .................................................................................................3-2

3-2-1 Connection of Devices ......................................................................................................3-2

3-2-1-1. Fieldbus Preparation ..........................................................................................3-2

3-2-1-2. Cables, terminals and glands ............................................................................3-3

3-2-2 Host Setting ......................................................................................................................3-4

3-2-3 Bus Power ON ..................................................................................................................3-4

3-2-4 Integration of DD ..............................................................................................................3-5

3-2-5 Reading the Parameters ...................................................................................................3-5

3-2-6 Continuous Record of Values ...........................................................................................3-5

3-2-7 Generation of Alarm .........................................................................................................3-5

3-3 Configuration ...................................................................................................3-6

3-3-1 Network Design ................................................................................................................3-6

3-3-2 Network Definition.............................................................................................................3-7

3-3-3 Definition of Combining Function Blocks ..........................................................................3-8

3-3-4 Setting of Tags and Addresses ........................................................................................3-9

3-3-5 Communication Setting...................................................................................................3-10

3-3-5-1 VCR Setting.......................................................................................................3-10

3-3-5-2 Function Block Execution Control .....................................................................3-12

3-3-6 Block Setting ...................................................................................................................3-12

3-3-6-1 Link Object ........................................................................................................3-12

3-3-6-2 Trend Object......................................................................................................3-13

3-3-6-3 View Object .......................................................................................................3-14

3-3-6-4 Function Block Parameters ...............................................................................3-18

3-4 In-process operation ...................................................................................... 3-22

3-4-1 Mode Transition ..............................................................................................................3-22

3-4-2 Generation of Alarm ......................................................................................................3-22

3-4-2-1 Indication of Alarm ............................................................................................3-22

3-4-2-2 Alarms and Events ............................................................................................3-22

3-4-3 Simulation Function ........................................................................................................3-23

3-5 Device status .................................................................................................3-25

3-6 List of parameters for each block of the EXA ................................................. 3-28

3-6-1 Resource Block...............................................................................................................3-28

3-6-2 Analog input Block ..........................................................................................................3-30

3-6-3 Transducer Block ............................................................................................................3-32

3-6-3-1 Transducer Block PH202 ..................................................................................3-32

3-6-3-2 Transducer Block SC202 ..................................................................................3-35

3-6-3-3 Transducer Block ISC202 .................................................................................3-38

3-6-3-4 Transducer Block DO202 ..................................................................................3-41

3-7 Application setting and change of basic parameters .....................................3-43

3-7-1 Applications and selection of basic parameters .............................................................3-43

3-7-2 Setting and change of basic parameters ........................................................................3-44

3-7-3 Setting the AI Function Blocks .......................................................................................3-44

3-7-4 Setting the Transducer Block .........................................................................................3-45

IM 12A00A01-61E

3-8 Operation of each parameter in failure mode ................................................3-46

3-8-1 Operation of each parameter in failure mode PH202 ....................................................3-46

3-8-2 Operation of each parameter in failure mode SC202 ....................................................3-48

3-8-3 Operation of each parameter in failure mode ISC202 ...................................................3-50

3-8-4 Operation of each parameter in failure mode DO202 ....................................................3-52

4. PrOFIBUS ........................................................................................................... 4-1

4-1. About Profibus ................................................................................................4-1

4-1-1 Outline ..............................................................................................................................4-1

4-1-2 Internal Structure of EXA ..................................................................................................4-1

4-1-3 Logical Structure of Each BLOCK ....................................................................................4-1

4-1-4 Wiring System Configuration ............................................................................................4-2

4-2. Preparation .....................................................................................................4-4

4-2-1. Cables, terminals and glands ..........................................................................................4-4

4-2-2. Shielding and grounding ..................................................................................................4-4

4-3. GETTING STARTED ......................................................................................4-5

4-3-1 Connection of Devices ......................................................................................................4-5

4-3-2 Host Setting ......................................................................................................................4-6

4-3-3 Bus Power ON ..................................................................................................................4-6

4-3-4 Reading cyclic parameters ...............................................................................................4-6

4-3-5 Reading acyclic parameters .............................................................................................4-7

4-4. Function block parameters and Methods ........................................................4-8

4-4-1. Physical Block Parameters ..............................................................................................4-8

4-4-2. Analog Input Block Parameters .......................................................................................4-8

4-4-3. Transducer block parameters ..........................................................................................4-9

4-4-3-1. Transducer block parameters PH202 ................................................................4-9

4-4-3-2. Function Block Parameters SC202 ..................................................................4-12

4-4-3-3. Function Block Parameters ISC202 .................................................................4-14

4-4-3-4. Function Block Parameters DO202..................................................................4-17

4-4-4 Methods ..........................................................................................................................4-19

APPENdIX 1. LINK MASTEr FUNCTIONS ........................................................... 5-1

A1-1 Link Active Scheduler .................................................................................... 5-1

A1-2 Link Master .................................................................................................... 5-1

A1-3 Transfer of LAS .............................................................................................5-2

A1-4 LM Functions ................................................................................................. 5-3

A1-5 LM Parameters .............................................................................................. 5-4

A1-5-1 LM Parameter List ..........................................................................................................5-4

A1-5-2 Descriptions for LM Parameters.....................................................................................5-6

A1-6 FAQs .............................................................................................................5-8

rEvISION rECOrd ....................................................................................................

IM 12A00A01-61E

Introduction 1-1

Manual Name IM No. Instruments mentioned

2-wire pH/ORP Transmitter IM 12B07D02-01E PH202G, PH202S 2-wire Conductivity or Resistivity Transmitter IM 12D08B02-01E SC202G, SC202S 2-wire Inductive Conductivity Transmitter IM 12D06A03-01E ISC202G, ISC202S 2-wire Dissolved Oxygen Transmitter IM 12J05C01-01E DO202G, DO202S

T01.EPS

1. IntroductIon

In the standard user’s manual delivered with the 202 analyzer all necessary information about HART-communication is included. This manual describes only those topics that are required for operation of the fieldbus communications. For information about instruments related to the EXA202, refer to the following User’s Manuals.

IM 12A00A01-61E

Safety Precautions 2-1

WARNING

CAUTION

IMPORTANT

WARNING

CAUTION

2. SAFETy PrECAUTIONS

• For the protection and safety of the operator and the instrument or the system including the instrument, please be sure to follow the instructions on safety described in this manual when handling this instrument.

In case the instrument is handled in contradiction to these instructions, Yokogawa does not guarantee

safety.

• For the intrinsically safe equipment and explosionproof equipment, in case the instrument is not restored to its original condition after any repair or modification undertaken by the customer, intrinsically safe construction or explosionproof construction is damaged and may cause dangerous condition. Please contact Yokogawa for any repair or modification required to the instrument.

• The following safety symbol marks are used in this Manual:

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

Indicates that operating the hardware or software in this manner may damage it or lead to system failure.

NOTE Draws attention to information essential for understanding the operation and features.

• Instrument installed in the process is under pressure. Never loosen or tighten the process connector bolts as it may cause dangerous spouting of process fluid.

• During draining condensate or venting gas in transmitter pressure-detector section, take appropriate care to avoid contact with the skin, eyes or body, or inhalation of vapors, if the accumulated process fluid may be toxic or otherwise harmful.

Since draining condensate or bleeding off gas gives the pressure measurement distur-bance, this should

not be done when the loop is in operation.

• If the accumulated process fluid may be toxic or otherwise harmful, take appropriate care to avoid contact with the body, or inhalation of vapors even after dismounting the instrument from process line for maintenance.

This instrument is tested and certified as intrinsically safe type or explosionproof type. Please note that the construction of the instrument, installation, external wiring, maintenance or repair is strictly restricted, and non-observance or negligence of these restriction would result dangerous condition.

IM 12A00A01-61E

Foundation Fieldbus 3-1

System/network management VFD

Function block VFD

PD Tag

Sensor

input

Resource block

Block tag

Parameters

Communication

parameters

VCR

Node address

Function block

execution schedule

AI function

block

AI function

block

Output

AI function

block

Block tag

OUT

Parameters

Transducer

block

Block tag

Parameters

Sensor

3. FOUNdATION FIELdBUS

3-1 About Foundation Fieldbus

3-1-1 Outline

Fieldbus is a bi-directional digital communication protocol for field devices, which offers an advancement implementation technologies for process control systems and is widely employed by numerous field devices.

EXA Series Fieldbus communication type employs the specification standardized by The Fieldbus Foundation, and provides interoperability between Yokogawa devices and those produced by other manufacturers. Fieldbus comes with software consisting of three AI function blocks, providing the means to implement flexible instrumentation system.

For information on other features, engineering, design, construction work, startup and maintenance of Fieldbus, refer to http://www.yokogawa.com/fbs/fbs-index.htm.

3-1-2 Internal Structure of EXA

The EXA contains two virtual field devices (VFD) that share the following functions.

3-1-2-1 System/network Management vFd

• Sets node addresses and Physical Device tags (PD Tag) necessary for communication

• Controls the execution of function blocks

• Manages operation parameters and communication resources (Virtual Communication Relationship: VCR)

3-1-2-2 Function Block vFd

(1) resource block

• Manages the status of EXA hardware

• Automatically informs the host of any detected faults or other problems

(2) Transducer block

• Converts sensor output to process values and transfers to AI function block by channels

(3) AI1, AI2, AI3 function block

• Conditions raw data from the Transducer block

• Outputs conditioned process values

• Carries out scaling, damping and square root extraction

3-1-3 Logical Structure of Each Block

Setting of various parameters, node addresses, and PD Tags shown in Figure 3.1 is required before starting operation.

Figure 3.1 Logical Structure of Each Block

IM 12A00A01-61E

3-2 Foundation Fieldbus

Sensor cable gland

Foundation Fieldbus®

cable gland Grounding terminal (connect to safety ground, only if power supply is not grounded)

3-1-4 Wiring System Configuration

The number of devices that can be connected to a single bus and the cable length vary depending on system design. When constructing systems, both the basic and overall design must be carefully considered to allow device performance to be fully exhibited.

3-2 Getting started

Fieldbus is fully dependent upon digital communication protocol and differs in operation from conventional 4 to 20 mA transmission communication protocol. It is recommended that novice users use field devices in accordance with the procedures described in this section. The procedures assume that field devices will be set up on a bench or an instrument shop.

3-2-1 Connection of Devices

3-2-1-1. Fieldbus Preparation

The Foundation Fieldbus® connections and the sensor connections should be made in accordance with figure 3.2 and 3.3. The terminals are of a plug in style for ease of mounting. The EXA 202 FF is provided with two cable glands. The first is used for the electrode wiring as the other is used for the power/foundation® Fieldbus wiring shown in figure 3.2. To open the EXA 202 for wiring:

1. Loosen the four frontplate screws and remove the cover.

2. The terminal strip is now visible.

3. Connect the power supply to the green connector according figure 3.3. Use the gland on the left for this cable.

4. Connect the sensor input, using the gland on the right (see figure 3.2). Switch on the power. Commission the instrument as required or use the default settings.

5. Replace the cover and secure frontplate with the four screws.

Figure 3.2 Glands to be used for cabling

Figure 3.3 Green connector for power supply

IM 12A00A01-61E

Foundation Fieldbus 3-3

EXA

Power supply

Terminator

HOST

Coupler/terminator

IMPORTANT

3-2-1-2. Cables, terminals and glands

The EXA202 is equipped with terminals suitable for the connection of finished cables in the size range:

0.13 to 2.5 mm (26 to 14 AWG). The glands will form a tight seal on cables with an outside diameter in the

range of 6 to 12 mm (0.24 to 0.47 inches). The following instruments are required for use with Fieldbus devices:

• Power supply

Fieldbus requires a dedicated power supply. It is recommended that current capacity be well over the total value of the maximum current consumed by all devices (including the host). Conventional DC current cannot be used as is.

• Terminator

Fieldbus requires two terminators. Refer to the supplier for details of terminators that are attached to the host.

• Field devices

Connect EXA Fieldbus communication type. Two or more EXA devices or other devices can be connected.

• Host

Used for accessing field devices. A dedicated host (such as DCS) is used for an instrumentation line while dedicated communication tools are used for experimental purposes. For operation of the host, refer to the instruction manual for each host. No details of the host are explained in the rest of this material.

• Cable

Used for connecting devices. Refer to “Fieldbus Technical Information” (TI 38K03A01-01E) for details of instrumentation cabling. Fieldbus uses twisted pair wires. To meet the Electro Magnetic Interference standards a shielded twisted pair is obligated.

Refer to Yokogawa when making arrangements to purchase the recommended equipment. Connect the devices as shown in Figure 3.4. Connect the terminators at both ends of the trunk, with a mini-

mum length of the spur laid for connection. The polarity of signal and power must be maintained.

Figure 3.4 Cabling

NOTE Before using a Fieldbus configuration tool other than the existing host, confirm it does not affect

the loop functionality in which all devices are already installed in operation. Disconnect the relevant control loop from the bus if necessary.

Connecting a Fieldbus configuration tool to a loop with its existing host may cause communication data scrambles resulting in a functional disorder or a system failure.

IM 12A00A01-61E

3-4 Foundation Fieldbus

IMPORTANT

Not used

LM device

Not used

Basic device

Default address

Portable-device address

V (FUN)

V (FUN) + V (NUN)

V (NUN)

0xFF

0xFC

0xFB

0xF8

0xF7

0x00

0x0F

0x10 0x13

0x14

Bridge device

Note 1: LM device: with bus control function (Link Master function) Note 2: BASIC device: without bus control function

EXA

3-2-2 Host Setting

To activate Fieldbus, the following settings are required for the host.

Do not turn off the power immediately after setting. When the parameters are saved to the EEPROM, the redundant processing is executed for an improvement of reliability. If the power is turned off within 60 seconds after setting is made, the modified parameters are not saved and the settings may return to the original values.

Table 3.1 Operation Parameters

Symbol Parameter Description and Settings

V (ST) Slot-Time Set 4 or greater value. V (MID) Minimum-Inter-PDU-Delay Set 4 or greater value. V (MRD) Maximum-Reply-Delay Set so that V (MRD) X V (ST) is 12 or greater V (FUN) First-Unpolled-Node Define the first address that can be used by the host. Set 0x15 or greater. V (NUN) Number-of-consecutive-Unpolled-Node This sets the number of consecutive unpolled nodes. EXA address is

factory-set to 0xEB. Set this address to be within the range of the BASIC device in Figure 3.5.

Figure 3.5 Available Address Range

3-2-3 Bus Power ON

Turn on the power of the host and the bus. First all segments of the display are lit, then the display begins to operate. If the indicator is not lit, check the polarity of the power supply.

Using the host device display function, check that the EXA is in operation on the bus. Unless otherwise specified, the following settings are in effect when shipped from the factory.

PH202 SC202 ISC202 DO202 PD tag PH1001 SC1001 ISC1001 DO1001 Node addr. 232 233 234 235 DEV_TYPE 0x0830 0x0831 0x0832 0x0833

If no EXA is detected, check the available address range and the polarity of the power supply. If the node address and PD tag are not specified when ordering, default value is factory set. If two or more EXA’s are connected at a time with default value, only one EXA will be detected from the host as EXA’s have the same initial address. Separately connect each EXA and set a different address for each.

IM 12A00A01-61E

Foundation Fieldbus 3-5

3-2-4 Integration of dd

If the host supports DD (Device Description), the DD of the EXA needs to be installed. Check if host has the following directory under its default DD directory.

594543\DEV_TYPE (594543 is the manufacturer number of Yokogawa Electric Corporation, and DEV_TYPE is the EXA device number, respectively.) If this directory is not found, DD of EXA has not been included. Create the above directory and copy the DD file (0m0n.ffo,0m0n.sym) (m, n is a numeral) (to be supplied separately) into the directory.

Once the DD is installed in the directory, the name and attribute of all parameters of the EXA are displayed. Off-line configuration is possible by using Capability file (CFF).

3-2-5 reading the Parameters

To read EXA parameters, select the AI1 block of the EXA from the host screen and read the OUT parameter. The current process value is displayed. Check that MODE_BLOCK of the function block and resource block is set to AUTO.

3-2-6 Continuous record of values

If the host has a function of continuously recording the indications, use this function to list the indications (values). Depending on the host being used, it may be necessary to set the schedule of Publish (the function that transmits the indication on a periodic basis).

3-2-7 Generation of Alarm

If the host is allowed to receive alarms, generation of an alarm can be attempted from EXA. In this case, set the reception of alarms on the host side. EXA’s VCR-7 is factory-set for this purpose. For practical purposes, all alarms are placed in a disabled status; for this reason, it is recommended that you first use one of these alarms on a trial basis. Set the value of link object-3 (index 30002) as “0, 299, 0, 6, 0”. Refer to section 3-3-6-1 Link Object for details.

Since the LO_PRI parameter (index 4029) of the AI1 block is set to “0”, try setting this value to “3”. Select the Write function from the host in operation, specify an index or variable name, and write “3” to it.

The LO_LIM parameter (index 4030) of the AI1 block determines the limit at which the lower bound alarm for the process value is given. In usual cases, a very small value is set to this limit. Set a value higher than the current process value, a lower bound alarm is raised. Check that the alarm can be received at the host. When the alarm is confirmed, transmission of the alarm is suspended.

The above-mentioned items are a description of the simple procedure to be carried out until EXA is connected to Fieldbus. In order to take full advantage of the performance and functionality of the device, it is recommended that it be read together with Chapter 5 of relevant User’s Manual, which describes how to use the EXA.

IM 12A00A01-61E

3-6 Foundation Fieldbus

3-3 Configuration

This chapter contains information on how to adapt the function and performance of the EXA to suit specific applications. Because two or more devices are connected to Fieldbus, settings including the requirements of all devices need to be determined. Practically, the following steps must be taken.

(1) Network design

Determines the devices to be connected to Fieldbus and checks the capacity of the power supply.

(2) Network definition

Determines the tag and node addresses for all devices.

(3) definition of combining function blocks

Determines the method for combination between each function block.

(4) Setting tags and addresses

Sets the PD Tag and node addresses one by one for each device.

(5) Communication setting

Sets the link between communication parameters and function blocks.

(6) Block setting

Sets the parameters for function blocks.

The following section describes each step of the procedure in the order given. Using a dedicated configuration tool allows the procedure to be signifi-cantly simplified. This section describes the procedure to be assigned for a host which has relatively simple functions.

3-3-1 Network design

Select the devices to be connected to the Fieldbus network. The following instruments are necessary for operation of Fieldbus.

• Power supply

• Terminator

Fieldbus requires two terminators. Refer to the supplier for details of terminators that are attached to the host.

• Field devices

Connect the field devices necessary for instrumentation. EXA has passed the interoperability test conducted by The Fieldbus Foundation. In order to properly start Fieldbus, it is recommended that the devices used satisfy the requirements of the above test.

• Host

Used for accessing field devices. A minimum of one device with bus control function is needed.

• Cable

Used for connecting devices. Refer to “Fieldbus Technical Information” for details of instrumentation cabling. Provide a cable sufficiently long to connect all devices. For field branch cabling, use terminal boards or a connection box as required.

IM 12A00A01-61E

Foundation Fieldbus �-� �-�

Not used

LM device

Not used

Basic device

Default address

Portable-device address

V (FUN)

V (FUN) + V (NUN)

V (NUN)

0xFF

0xFC

0xFB

0xF8

0xF7

0x00

0x0F

0x10 0x13

0x14

Bridge device

Note 1: LM device: with bus control function (Link Master function) Note 2: BASIC device: without bus control function

(EXA 0xEB)

First, check the capacity of the power supply. The power supply capacity must be greater than the sum of the maximum current consumed by all devices to be connected to Fieldbus. The maximum current consumed (power supply voltage 9 to �2 V) for EXA is 26.0 mA. The cable must have the spur in a minimum length with terminators installed at both ends of the trunk.

3-3-2 Network Definition

Before connection of devices with Fieldbus, define the Fieldbus network. Allocate PD Tag and node addresses to all devices (excluding such passive devices as terminators).

The PD Tag is the same as the conventional one used for the device. Up to �2 alphanumeric characters may be used for definition. Use a hyphen as a delimiter as required.

The node address is used to specify devices for communication purposes. Because data is too long for a PD Tag, the host uses the node address in place of the PD Tag for communication. A range of 20 to 24� (or hexadecimal 0x14 to 0xF�) can be set.

Addresses of devices with Link Master capabilities are set in a low address range smaller than V(FUN). Addresses of basic devices are set in a higher range bigger than V(FUN) + V(NUN). Specify the adress range used by setting the following two parameters in the LM-device:

Table 3.2 Parameters for Setting Address Range

Symbol Parameters Description

V (FUN) First-Unpolled-Node Indicates the address next to the address range used for the host or other

LM device.

V (NUN) Number-of-consecutive-Unpolled-Nodes Unused address range

The devices within the address range written as “Not used” in Figure �.6 cannot be used on a Fieldbus. For other address ranges, the range is periodically checked to identify when a new device is connected. Care must be taken not to allow the address range to become wider, which can lead to exhaustive consumption of Fieldbus communication performance.

Figure 3.6 Available Range of Node Addresses

To ensure stable operation of Fieldbus, determine the operation parameters and set them to the LM devices. While the parameters in Table �.� are to be set, the worst-case values of all the devices to be connected to the same Fieldbus must be used. Refer to the specification of each device for details. Table �.� lists EXA specification values.

IM 12A00A01-61E

3-8 Foundation Fieldbus

LIC100

FIC100

FC100

FI100

EXA

LI100

EXA

Table 3.3 Operation Parameter Values of the EXA to be Set to LM Devices

Symbol Parameters Description and Settings

V (ST) Slot-Time Indicates the time necessary for immediate reply of the device. Unit of time is in octets

(256 µs). Set maximum specification for all devices. For EXA, set a value of 4 or greater.

V (MID) Minimum-Inter-PDU-Delay Minimum value of communication data intervals. Unit of time is in octets (256 µs). Set the

maximum specification for all devices. For EXA, set a value of 4 or greater.

V (MRD) Maximum-Reply-Delay The worst case time elapsed until a reply is recorded. The unit is Slot-time; set the value

so that V (MRD) 3V (ST) is the maximum value of the specification for all devices. For EXA, the setting must be a value of 12 or greater.

3-3-3 Definition of Combining Function Blocks

The input/output parameters for function blocks are combined. For the EXA, three AI blocks output parameter (OUT) are subject to combination. They are combined with the input of the control block as necessary. Practically, setting is written to the EXA link object with reference to “Block setting” in Section 3-3-6 for details. It is also possible to read values from the host at proper intervals instead of connecting the EXA block output to other blocks.

The combined blocks need to be executed synchronously with other blocks on the communications schedule. In this case, change the EXA schedule according to the following table. Enclosed values in the table are factory-settings.

Table 3.4 Execution Schedule of the EXA Function Blocks

Index Parameters Setting (Enclosed is factory-setting)

269(SM) MACROCYCLE_DURATION

276(SM) FB_START_ENTRY.1

277(SM) FB_START_ENTRY.2

278(SM) FB_START_ENTRY.3 279(SM) to

289(SM)

FB_START_ENTRY.4 to 14 Not used.

Cycle (MACROCYCLE) period of control or measurement. Unit is 1/32 ms. (32000 = 1 s)

AI1 block startup time. Elapsed time from the start of MACROCYCLE specified in 1/32 ms. (0 = 0 s)

AI2 block startup time. Elapsed time from the start of MACROCYCLE specified in 1/32 ms. (9600 = 0.3 s)

AI3 block startup time. Elapsed time from the start of MACROCYCLE specified in 1/32 ms. (19200 = 0.6 s)

A maximum of 29 ms is taken for execution of an AI block. Executions of AI blocks should be scheduled sequentially. In no case should two AI function blocks of the EXA be executed at the same time (execution time is overlapped). 29 ms after AI block execution start the out value is available for further processing. Figure 3.8 shows an example of schedule based on the loop shown in Figure 3.7.

Figure 3.7 Example of Loop Connecting Function Block of Two EXA with Other Instruments

IM 12A00A01-61E

Foundation Fieldbus 3-9 3-9

LI100

LIC100

FIC100

FC100

FI100

Commu-

nication

Schedule

OUT

CAS_IN

BKCAL_OUT

BKCAL_IN

BKCAL_OUT

Unscheduled

Communication

Scheduled Communication

Macrocycle (Control Period)

Figure 3.8 Function Block Schedule and Communication Schedule

When the macrocycle is set to more than 4 seconds, set the following intervals to be more than 1% of the macrocycle.

- Interval between “end of block execution” and “start of sending CD from LAS”

- Interval between “end of block execution” and “start of the next block execution”“end of block execution” and “start of the next block execution”

3-3-4Settingof Tags andAddresses Setting of Tags and Addresses

This section describes the steps in the procedure to set PD Tags and node addresses in the EXA. There are three states of Fieldbus devices as shown in Figure 3.9, and if the state is other than SM_ OPERATIONAL state, no function block is executed. EXA must be transferred back to this state after a tag or address is changed.

UNINITIALIZED

(No tag nor address is set)

Tag clear Tag setting

INITIALIZED

(Only tag is set)

Address clear Address setting

SM_OPERATIONAL

(Tag and address are retained, and

the function block can be executed.)

Figure 3.9 Status Transition by Setting PD Tag and Node Address

EXA has a PD Tag and node address that are set upon shipment from the factory unless otherwise specified. To change only the node address, clear the address once and then set a new node address. To set the PD Tag, first clear the node address and clear the PD Tag, then set the PD Tag and node address again.

Devices whose node address was cleared will await the default address (randomly chosen from a range of 248 to 251, or from hexadecimal F8 to FB). It is necessary to confirm the device ID in order to correctlyorder to correctly specify the device. The device ID of the EXA is 594543083xxxxxxxxx. (The xxxxxxxxx at the end of the above device ID is a total of 9 alphanumeric characters. The characters displyed on the screen when each instrument is powered on, correspond to the xxxxxxxxx and if necessary, should be recorded.)

IM 12A00A01-61E

3-10 Foundation Fieldbus

3-3-5 Communication Setting

To set the communication function, it is necessary to change the database residing in SM-VFD.

3-3-5-1 VCR Setting

Set VCR (Virtual Communication Relationship), which specifies the called party for communication and resources. EXA has 33 VCRs whose application can be changed, except for the first VCR, which is used for management.

EXA has VCRs of 3 types:

Publisher(-Subscriber) VCR

Publisher-Subscriber VCR’s are designed to link Function Blocks. When a publishing Function Block runs, its output data is stored in the buffer of the Publisher VCR. Then the LAS (LM) sends a CD to this VCR to force it to transfer the data. Subscriber VCRs receive this data and gives this to the subscribing Function Blocks. Typical example is a linkage from an output of an Analog Input (AI) block to the process value input of the PID control block.

Publisher-Subscriber model is one-to-many one-way Communication. Subscribers are able to know whether data is updated since the last publish. This mechanism is important because Data Link Layer transfers data as scheduled regardless the publishing Function Block updates the data in the buffer.

(Client-)Server Model

Client-Server model is universal and used in many communication technologies. An application called “Client” requests another application called “Server” to do a specific action. When the Server finishes the requested action, its result is transferred back to the Client. It is an one-to-one two-way communication. Typical example is a human-machine interface (Client) to read data of a Function Block (Server). The Client sends a Read request to the Server and then the Server sends back the data to the Client. This communication is unscheduled and is handled during the unscheduled interval in the macrocycle. A Client may want to issue many requests at a time. A Client-Server VCR has a queue to store those requests and sends the requests one by one when the node has the token.

Source(-Sink) Model

A Source-Sink VCR is designed to broadcast messages. It is one-to-many one-way communication without any schedule. This model is sometimes called “Report Distribution Model.” A Source VCR transfers a message in the queue to an assigned global address when the device has the token. Sink VCRs are set to the same global address and receive the same message from a Source. Foundation devices use this model for two specific purposes. One is to report alarms or events detected in the Source and the other is to transmit trends of Source Function Blocks. Alarms are acknowledged through a Client-Server VCR. It is desirable for an alarm logger to receive alarms from all devices with just one VCR. A Sink can receive messages from many Sources if the Sources are configured to send messages to the same global address.

A Source VCR transmits data without established connection. A Sink (QUU) VCR on another device can receive it if the Sink is configured so. A Publisher VCR transmits data when LAS requests so. An explicit connection is established from VCR(s) so that a Subscriber knows the format of published data.

Each VCR has the parameters listed in Table 3.5. Parameters must be changed together for each VCR because modification for each parameter may cause inconsistent operation.

IM 12A00A01-61E

Table 3.5 VCR Static Entry

Subindex

1 FasArTypeAndRole Indicates the type and role of

2 FasDllLocalAddr Sets the local address to

3 FasDllConfigured

4 FasDllSDAP Specifies the quality of

5 FasDllMaxConfirm

6 FasDllMaxConfirm

7 FasDllMaxDlsduSize Specifies maximum DL Service

8 FasDllResidual

9 FasDllTimeliness

Parameter Description

communication (VCR). The following 3 types are used for EXA. 0x32: Server (Responds to

requests from host.)

0x44: Source (Transmits alarm

or trend.)

0x66: Publisher (Sends AI

block output to other blocks.)

specify VCR in EXA. A range of 0x20 to 0xF7 in hexadecimal.

Sets the node address of the

RemoteAddr

DelayOnConnect

DelayOnData

ActivitySupported

Class

called party for communication and the address (DLSAP or DLCEP) used to specify VCR in that address. For DLSAP or DLCEP, a range of 0x20 to 0xF7 in hexadecimal is used. Addresses in Subindex 2 and 3 need to be set to the same contents of the VCR as the called party (local and remote are reversed).

communication. Usually, one of the following types is set. 0x2B: Server 0x01: Source (Alert) 0x03: Source (Trend) 0x91: Publisher

To establish connection for communication, a maximum wait time for the called party’s response is set in ms. Typical value is 60 seconds (60000).

For request of data, a maximum wait time for the called party’s response is set in ms. Typical value is 60 seconds (60000).

Data unit Size (DLSDU). Set 256 for Server and Trend VCR, and 64 for other VCRs.

Specifies whether connection is monitored. Set TRUE (0xff) for Server. This parameter is not used for other communication.

Not used.

Foundation Fieldbus 3-11

Subindex

10 FasDllPublisherTime

11 FasDllPublisher

12 FasDllSubsriberTime

13 FasDllSubscriber

14 FmsVfdId Sets VFD for EXA to be used.

15 FmsMaxOutstanding

16 FmsMaxOutstanding

17 FmsFeatures

Parameter Description

Not used.

WindowSize

Not used.

SynchronizaingDlcep

Not used.

WindowSize

Not used.

SynchronizationDlcep

0x1: System/network

management VFD

0x1234: Function block VFD Set 0 to Server. It is not

ServiceCalling

ServiceCalled

Supported

used for other applications. Set 1 to Server. It is not

used for other applications. Indicates the type of

services in the application layer. In the EXA, it is automatically set according specific applications.

3-11

33 VCRs are factory-set as shown in the table 3.6.

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3-12 Foundation Fieldbus

Table 3.6 VCR List VCR List

Index (SM) VCR Number Factory Setting

293 1 For system management (Fixed) 294 2 Server (LocalAddr = 0xF3) 295 3 Server (LocalAddr = 0xF4) 296 4 Server (LocalAddr = 0xF7) 297 5 Trend Source (LocalAddr = 0x07, Remote Address=0x111) 298 6 Publisher for AI1 (LocalAddr = 0x20) 299 7 Alert Source (LocalAddr = 0x07, Remote Address=0x110) 300 8 Server (LocalAddr = 0xF9) 301 to 325 to 325 9 to 33 Not set

3-3-5-2 Function Block Execution Control

According to the instructions given in Section 3-3-3, set the execution cycle of the function blocks and schedule of execution.

3-3-6 Block Setting

Set the parameter for function block VFD.

3-3-6-1 Link Object

Link object combines the data voluntarily sent by the function block with VCR. The EXA has 40 link objects. A single link object specifies one combination. Each link object has the parameters listed in Table 3.7. Parameters must be changed together for each VCR because the modifications made to each parameter may cause inconsistent operation.

Table 3.7 Link Object Parameters

Subindex

1 LocalIndex Sets the index of function block parameters to be combined; set “0” for Trend and Alert. 2 VcrNumber Sets the index of VCR to be combined. If set to “0”, this link object is not used. 3 RemoteIndex Not used in EXA. Set to “0”.

4 ServiceOperation

5 StaleCountLimit

Parameters Description

Set one of the following. Only one link object is used for Alert and/or Trend. 0: Undefined 2: Publisher 6: Alert 7: Trend

Set the maximum number of consecutive stale input values which may be received before the input status is set to BAD. To avoid the unnecessary mode transition caused when the data is not correctly received by subscriber, set this parameter to “2” or more.

Set link objects as shown in Table 3.8.

Table 3.8 Factory-Settings of Link Objects (example)

Index Link Object# Factory Settings

30000 1 AI1.OUT VCR#6 30001 2 Trend VCR#5 30002 3 Alert VCR#7 30003 to 30039 4 to 40 Not used

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Foundation Fieldbus 3-13

SMIB

(System Management Information Base)

NMIB

(Network Management Information Base)

AI3

OUT

AI1

OUT

AI2

OUT

FBOD

Alert

Trend

VCR

DLSAP DLCEP

Fieldbus Cable

0xF8 0xF3 0xF4 0xF7

0xF9

0x20 0x220x21

0x07

Device 3

#10

#1 #4

Resource block

Transducer block

Host 1

Host 2

Device 1

Device 2

Link object

#3 #4

3-13

3-3-6-2 Trend Object

It is possible to set the parameter so that the function block automatically transmits Trend. The EXA has ten Trend objects: eight for trends of analog paramenters and two for discrete parameters. A single Trend object specifies the trend of one parameter.

Each Trend object has the parameters listed in Table 3.9. The first four parameters are the items to be set. Before writing to a Trend object, it is necessary to release the WRITE_LOCK parameter.

Table 3.9 Parameters for Trend Objects

Sub-index Parameters Description

1 Block Index Sets the leading index of the function block that takes a trend. 2 Parameter Relative

Index

3 Sample Type Specifies how trends are taken. Choose one of the following 2 types:

4 Sample Interval Specifies sampling intervals in units of 1/32 ms. Set the integer multiple of the function block

5 Last Update The last sampling time. 6 to 21 List of Status 16 samples of status. 21 to 37 List of Samples 16 samples of data.

Sets the index of parameters taking a trend by a value relative to the beginning of the function block. In the EXA AI block, the following three types of trends are possible. 7: PV 8: OUT 19: FIELD_VAL

1:Sampled upon execution of a function block. 2:The average value is sampled.

execution cycle.

Ten trend objects are factory-set as shown Table 3.10.

Table 3.10 Trend Object are Factory-Set

Index Parameters Factory Settings

32000 to 32007 TREND_FLT.1 to TREND_FLT.8 Not used. 32008 to 32009 TREND_DIS.1 to TREND_DIS.2 Not used.

Figure 3.10 Example of Default Configuration

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3-14 Foundation Fieldbus

3-3-6-3 ViewObject6-3 View Object

This is the object to form groups of parameters in a block. One advantage of forming groups of parameters is the reduction of load for data transaction. The EXA has four View Objects for each Resource block, Transducer block and AI1, AI2, AI3 function block, and each View Object has the parameters listed in Table

3.12 to 3.14.

Table 3.11 Purpose of Each View Object

Description

VIEW_1 Set of dynamic parameters required by operator for plant

operation. (PV, SV, OUT, Mode etc.)

VIEW_2 Set of static parameters which need to be shown to plant

operator at once. (Range etc.) VIEW_3 Set of all the dynamic parameters VIEW_4 Set of static parameters for configuration or maintenance.

Table 3.12 Indexes of View for Each Block

VIEW_1 VIEW_2 VIEW_3 VIEW_4

Resource Block 40100 40101 40102 40103 Transducer Block 40200 40201 40202 40203 AI1 Function Block 40400 40401 40402 40403 AI2 Function Block 40410 40411 40412 40413 AI3 Function Block 40420 40421 40422 40423

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Table 3.13 View Object for Resource Block Table 3.13 View Object for Resource Block

Foundation Fieldbus 3-15

(contineous)

Relative Index

1 ST_REV 2 2 2 2 2 TAG_DESC 3 STRATEGY 2 4 ALERT_KEY 1 5 MODE_BLK 4 4 6 BLOCK_ERR 2 2 7 RS_STATE 1 1 8 TEST_RW 9 DD_RESOURCE 10 MANUFAC_ID 4 11 DEV_TYPE 2 12 DEV_REV 1 13 DD_REV 1 14 GRANT_DENY 2 15 HARD_TYPES 2 16 RESTART 17 FEATURES 2 18 FEATURE_SEL 2 19 CYCLE_TYPE 2 20 CYCLE_SEL 2 21 MIN_CYCLE_T 4 22 MEMORY_SIZE 2 23 NV_CYCLE_T 4 24 FREE_SPACE 4 25 FREE_TIME 4 4 26 SHED_RCAS 4 27 SHED_ROUT 4 28 FAULT_STATE 1 1 29 SET_FSTATE 30 CLR_FSTATE 31 MAX_NOTIFY 1 32 LIM_NOTIFY 1 33 CONFIRM_TIME 4 34 WRITE_LOCK 1 35 UPDATE_EVT 36 BLOCK_ALM 37 ALARM_SUM 8 8 38 ACK_OPTION 2 2 39 WRITE_PRI 40 WRITE_ALM 41 ITK_VER 2 42 SOFT_REV 43 SOFT_DESC 44 SIM_ENABLE_MSG 45 DEVICE_STATUS_1 4 46 DEVICE_STATUS_2 4 47 DEVICE_STATUS_3 4 48 DEVICE_STATUS_4 4

Parameter Mnemonic VIEW1VIEW2VIEW3VIEW

Relative

Index

49 DEVICE_STATUS_5 4 50 DEVICE_STATUS_6 4 51 DEVICE_STATUS_7 4 52 DEVICE_STATUS_8 4 53 54 55 56 57 58

Table 3.14 View Object for AI1.AI2.AI3 Function Block

Relative Index

1 ST_REV 2 2 2 2 2 TAG_DESC 3 STRATEGY 2 4 ALERT_KEY 1 5 MODE_BLK 4 4 6 BLOCK_ERR 2 2 7 PV 5 5 8 OUT 5 5 9 SIMULATE 10 XD_SCALE 11 11 OUT_SCALE 11 12 GRANT_DENY 2 13 IO_OPTS 2 14 STATUS_OPTS 2 15 CHANNEL 2 16 L_TYPE 1 17 LOW_CUT 4 18 PV_FTIME 4 19 FIELD_VAL 5 5 20 UPDATE_EVT 21 BLOCK_ALM 22 ALARM_SUM 8 8 23 ACK_OPTION 2 24 ALARM_HYS 4 25 HI_HI_PRI 1 26 HI_HI_LIM 4 27 HI_PRI 1 28 HI_LIM 4 29 LO_PRI 1 30 LO_LIM 4 31 LO_LO_PRI 1 32 LO_LO_LIM 4 33 HI_HI_ALM 34 HI_ALM 35 LO_ALM 36 LO_LO_ALM

Parameter Mnemonic VIEW1VIEW2VIEW3VIEW

SOFTDWN_PROTECT SOFTDWN_FORMAT SOFTDWN_COUNT SOFTDWN_ACT_AREA SOFTDWN_MOD_REV SOFTDWN_ERROR

TOTALS (# BYTES) 22 30 73 35

Parameter Mnemonic VIEW1VIEW2VIEW3VIEW

TOTALS (# BYTES) 31 26 31 46

3-15

1 1 2

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3-16 Foundation Fieldbus

Table 3.15 View Object for Transducer Block PH202 Table 3.15 View Object for Transducer Block PH202

(contineous)

Relative Index

0 BLOCK HEADER 1 ST_REV 2 2 2 2 2 TAG_DESC 3 STRATEGY 2 4 ALERT_KEY 1 5 MODE_BLK 4 4 6 BLOCK_ERR 2 2 7 UPDATE_EVT 8 BLOCK_ALM 9 TRANSDUCER_

10 11 XD_ERROR 1 1 12 COLLECTION_

13 14 PRIMARY_VALUE 5 5 15

16 SENSOR_TYPE_PH 17 SENSOR_MV 18 CAL_POINT_HI 4 19 CAL_POINT_LO 4 20 CAL_MIN_SPAN 4 21 SLOPE 4 22 SLOPE_UNIT 2 23 ZERO 4 24 ZERO_UNIT 2 25 ISOPOTENTIAL_PH 4 26 27 SENSOR_CAL_DATE 8 28 29 SECONDARY_

30 31 SENSOR_TEMP_

32 33 SENSOR_

34 35 TERTIARY_VALUE 5 5 36 TERTIARY_VALUE_

37 TERTIARY_ZERO 4 38 GLASS_IMPEDANCE 4 39 REFERENCE_

40 ALARM_SUM 8 8 41 DEV_ALARM 4 4 42 LOGBOOK1_RESET 43 LOGBOOK1_EVENT 44 LOGBOOK2_RESET 45 LOGBOOK2_EVENT 46 LOGBOOK_CONFIG 23 47 TEST_1 48-59 TEST_2 ... TEST_13 60 STABLE_TIME 61 STABLE_VALUE 62 CALL_MAINT_TIME_

63 CALL_MAINT_TIME_

64 INPUT_1_

65 INPUT_1_

PARAMETER NAME VIEW_1VIEW_2VIEW_3VIEW

DIRECTORY TRANSDUCER_TYPE

DIRECTORY PRIMARY_VALUE_TYPE

PRIMARY_VALUE_ RANGE

SENSOR_CAL_METHOD

SECONDARY_VALUE

VALUE_UNIT SENSOR_TEMP_COMP

MAN_VALUE SENSOR_TYPE_TEMP

CONNECTION_TEMP TERTIARY_VALUE_TYPE

RANGE

IMPEDANCE

COUNTD.

RELOAD

IMPEDANCE_LO_LIM

IMPEDANCE_HI_LIM

2 2 2 2

5 5

1 4

2 1

Relative Index

66 INPUT_2_

67 INPUT_2_

68 BUFFER1_ID 69 BUFFER1 70 BUFFER2_ID 71 BUFFER2 72 BUFFER3_ID 73 BUFFER3 74 TEMPERATURE_

75 PASSCODE_

76 PASSCODE_

77 PASSCODE_SERVICE 78 SAMPLE_PV 4 79 SAMPLE_PV2 4 80 SAMPLE_TEMP 4 81 ERROR_CONFIG 4 82 CONFIGURATION 4 83 TRANSMITTER_TIME 6 84 SOFTDWN_TEST 1

Table 3.16 View Object for Transducer Block SC202/ISC202

Realtive Index

0 BLK_DATA 1 ST_REV 2 2 2 2 2 TAG_DESC[32] 3 STRATEGY 2 4 ALERT_KEY 1 5 MODE_BLK 4 4 6 BLOCK_ERR 2 2 7 UPDATE_EVT 8 BLOCK_ALM 9 TRANSDUCER_

10 TRANSDUCER_TYPE 2 2 2 2 11 XD_ERROR 1 1 12 COLLECTION_

13 PRIMARY_VALUE_

14 PRIMARY_VALUE 5 5 15 PRIMARY_VALUE_

16 SENSOR_CONST 4 17 CAL_POINT_HI 4 18 CAL_POINT_LO 4 19 CAL_MIN_SPAN 4 20 SENSOR_CAL_

21 SENSOR_CAL_DATE 8 22 SECONDARY_VALUE 5 5 23 SECONDARY_VALUE_

24 SENSOR_TEMP_COMP 1 25

26 SENSOR_TYPE_TEMP 2 27

28 SENSOR_TYPE_COND 2 29 SENSOR_OHMS

PARAMETER NAME VIEW_1VIEW_2VIEW_3VIEW

IMPEDANCE_LO_LIM

IMPEDANCE_HI_LIM

COEFFICIENT

MAINTENANCE

COMMISSIONING

TOTALS (# BYTES) 38 18 65 119

Parameters Mnemonic

DIRECTORY[2]

DIRECTORY[7]

TYPE

RANGE

METHOD

UNIT

SENSOR_TEMP_MAN_ VALUE

SENSOR_CONNECTION_ TEMP

View1View2View3View

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Table 3.16 View Object for Transducer Block SC202/ISC202 (contineous)

Realtive Index

30 XD_MAN_ID[32] 31 TEMPERATURE_

32 CONCENTRATION 5 5 33 TERTIARY_VALUE 5 5 34 REFERENCE_

35 COMP_METHOD 1 1 36 COMP_MATRIX_SEL 1 37 TERTIARY_COMP_

38 TERT_TEMPERATURE_

39 ALARM_SUM 8 8 40 DEV_ALARM 4 4 41 LOGBOOK1_RESET 42 LOGBOOK1_EVENT 43 LOGBOOK2_RESET 44 LOGBOOK2_EVENT 45 LOGBOOK_CONFIG[16] 16 46 TEST_1 58 TEST_13 59 CALIB_SENSOR_

60 MATRIX_TEMP_RANGE 61 SOLUTION_1 62 SOLUTION_2 63 SOLUTION_3 64 SOLUTION_4 65 SOLUTION_5 66 CONCENTRATION_

67 CONCENTRATION_0 68 CONCENTRATION_100 69

72 E5_LIMIT 4 73 E6_LIMIT 4 74 DISPLAY_RESOLUTION 1 75 PASSCODE_

76 PASSCODE_

77 PASSCODE_SERVICE 2 78 ERROR_CONFIG 4 79 CONFIGURATION 4 80 TRANSMITTER_TIME 6 81 SOFTDWN_TEST 1

Table 3.17 View Object for Transducer Block DO202

Realtive Index

0 BLK_DATA 1 ST_REV 2 2 2 2 2 TAG_DESC[32] 3 STRATEGY 2 4 ALERT_KEY 1 5 MODE_BLK 4 4 6 BLOCK_ERR 2 2 7 UPDATE_EVT 8 BLOCK_ALM

Parameters Mnemonic

COEFF

TEMPERATURE

METHOD

COEFF

CONST

MEASUREMENT

CONCENTRATION_ TABLE_LOW CONCENTRATION_ TABLE_MID CONCENTRATION_ TABLE_HIGH

MAINTENANCE

COMMISSIONING

TOTALS (# BYTES) 43 17 54 96

Parameters Mnemonic

View1View2View3View

Table 3.17 View Object for Transducer Block DO202

Foundation Fieldbus 3-17

(continues)

Realtive

Index

9 TRANSDUCER_

10 TRANSDUCER_TYPE 2 2 2 2 11 XD_ERROR 1 1 12 COLLECTION_

13 14 PRIMARY_VALUE 5 5 15 PRIMARY_VALUE_

17 18 SAMPLE_CAL 19 ZERO_CURRENT 4 20 SENSITIVITY 4 21 22 AMP_SPAN_

23 AMP_ZERO_

24 SALINITY 4 25 BAR_PRESSURE 4 26 27

29 SECONDARY_VALUE 5 5 30 SECONDARY_

32 SENSOR_TEMP_

33 34 TEMP_SENSOR_CAL 4 35 SENSOR_CURRENT 5 5 36 37 38 ZERO_CAL 39 RESERVED1 40 RESERVED2 41 RESERVED3 42

43 PASSCODE_

44 PASSCODE_

45 PASSCODE_SERVICE 46 LOGBOOK1_RESET 47 LOGBOOK1_EVENT 48 LOGBOOK2_RESET 49 LOGBOOK2_EVENT 50 51 CALL_MAINT_TIME_

52 CALL_MAINT_TIME_

53 ERROR_CONFIG 4 54 CONFIGURATION 4 55 ALARM_SUM 8 8 56 DEV_ALARM 4 4 57 TEST_1 69 TEST_13 70 SOFTDWN_TEST 1

Parameters Mnemonic

DIRECTORY[2]

DIRECTORY[7] PRIMARY_VALUE_TYPE

RANGE PRIMARY_VALUE_UNIT SENSOR_TYPE_OXYGEN

AMP_STABILIZE_TIME

STABILIZE _VALUE

STABILIZE_VALUE

BAR_PRESSURE_UNIT PERCENT_SATURATION_ PRESSURE CHLORINE_ CALIBRATION_RANGES

VALUE_UNIT SENSOR_TEMP_COMP

MAN_VALUE SENSOR_TYPE_TEMP

PERCENT_SATURATION ZERO_CURRENT_LIMIT

TRANSMITTER_TIME[6]

MAINTENANCE

COMMISSIONING

LOGBOOK_CONFIG[25]

RELOAD

COUNTDOWN

TOTALS (# BYTES) 43 12 50 102

View1View2View3View

3-17

2 2

2 4

1 4

5 5 4

25 1

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3-18 Foundation Fieldbus

3-3-6-4 Function Block Parameters

Function block parameters can be read from the host or can be set. For a list of the parameters of blocks held by the EXA, refer to “3-6 List of parameters for each block of the EXA”. The following is a list of important parameters with a guide how to set them.

MODE_BLK:

This mode parameter is very important as it gives the state of the block. In O/S (Out_Of_Service) mode the block is out of operation. In this mode it is allowed to update parameters. Manual mode gives the operator the possibility to manually update a selected number of parameters (values, scaling e.g.) in order to test the system. In automatic mode the function block is executed and block parameters are automatically updated. Under normal operating circumstances, set the Auto mode for normal operation. Auto mode is the factory default.

Note: The actual mode is changed by setting the target mode. When the resource block mode is set to

OOS all function blocks in the VFD are set to OOS mode.

CHANNEL:

Transducer blocks convert raw signals into process values. The values are assigned to channels. For the EXA 202 three or four channels are available.

PH202

1: pH, 2: Temperature, 3: ORP/rH

Channel value unit

1 primary_value primary_value_range.unit 2 secondary_value secondary_value_unit 3 tertiary_value tertiary_value_range.unit

SC202

1: Conductivity/Resistivity, 2: Temperature, 3: Second Conductivity/Resistivity, 4: Concentration

Channel value unit

1 primary_value primary_value_range.units 2 secondary_value secondary_value_unit 3 tertiary_value primary_value_range.units 4 concentration always %

ISC202

1: Conductivity, 2: Temperature, 3: Second Conductivity, 4: Concentration

Channel value unit

1 primary_value primary_value_range.units 2 secondary_value secondary_value_unit 3 tertiary_value primary_value_range.units 4 concentration always %

IM 12A00A01-61E

Foundation Fieldbus 3-19

3-19

DO202

1: Dissolved Oxygen, 2: Temperature, 3: Percent Saturation, 4: Sensor Current

Channel Value Unit

1 primary_value primary_value_range.units 2 secondary_value secondary_value_unit 3 percent_saturation % 4 sensor_current nA

XD_SCALE/OUT_SCALE:

Scaling information is used for two purposes. Display devices need to know the range for bar graphs and trending, as well as the units code. Control blocks need to know the range to use internally as percent of span, so that the tuning constants may remain dimensionless. This is converted back to a number with units by using the range of OUT_SCALE. The AI block has the parameter XD_SCALE to define the units expected from the transducer.

Transducer scaling (XD_SCALE) is applied to the value from the channel to produce the FIELD_VAL in percent. The XD_SCALE units code must match the channel units code. The EXA transmitter does this automatically when the Service Codes are changed. See table 3.18 to 3.21 for the Service codes and their results. If L_TYPE is set to Indirect or Ind Sqr Root, OUT_SCALE determines the conversion from FIELD_VAL to the output. PV and OUT always have identical scaling. OUT_SCALE provides scaling for PV. The PV is always the value that the block will place in OUT if the mode is Auto.

Table 3.18 Unit Index by XD_SCALE PH202

Channel FF parameters Service code XD_SCALE.UNITS

1 - SC01 (set to 0) pH 2 2029 SC11 (set to 0) ºC 2 2029 SC11 (set to 1) ºF 3 - SC01 (set to 1) mV 3 - SC01 (set to 0), SC02 (set to 1) mV 3 - SC01 (set to 0), SC02 (set to 2) rH

Table 3.19 Unit Index by XD_SCALE SC202

Channel FF parameters Service code XD_SCALE.UNITS

2 2023 SC11 (set to 0) °C (1001) 2 2023 SC11 (set to 1) °F (1002) 1, 3 - SC01 (set to 1) Ω•cm (1295) 1, 3 - SC01 (set to 0) S/cm (1594) 4 - Default % % (1342)

Table 3.20 Unit Index by XD_SCALE ISC202

Channel FF parameters Service code XD_SCALE.UNITS

2 2023 SC11 (set to 0) °C (1001) 2 2023 SC11 (set to 1) °F (1002) 1, 3 - Default S/cm S/cm (1594) 4 - Default % % (1342)

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3-20 Foundation Fieldbus

0%, 0ºC

100%, 212ºF

0%, 32ºF

CHANNEL

PV / OUT

OUT_SCALEXD_SCALE

100%, 100ºC

Table 3.21 Unit Index by XD_SCALE DO202

Channel FF parameters Service code XD_SCALE.UNITS

2 FF2030 SC11 (set to 0) °C (1001) 2 FF2030 SC11 (set to 1) °F (1002) 1 FF2016 SC56 (set to 0) ppm (1423) 1 FF2016 SC56 (set to 1) ppb (1424) 1 FF2016 SC56 (set to 2) % (1342) 3 - Default % % (1342) 4 - Default nA nA (1213)

L_TYPE:

Specifies the operation function of the AI block. If set to “Direct”, the input delivered to CHANNEL is directly reflected on OUT. If set to “Indirect”, scaling by XD_SCALE and OUT_SCALE is carried out and is reflected on OUT. If set to “Indirect SQRT”, after scaling by XD_SCALE, the square root is extracted and the value scaled by OUT_SCALE is reflected on OUT.

Example: Channel range is defined as 0 to 100 °C but °F units is required for HOST display. Set the following parameters:

XD_SCALE: EU@0% = 0 °C EU@100% = 100 °C Unit = °C Decimal point = 2 OUT_SCALE: EU@0% = 32 °F EU@100% = 212 °F Unit = °F Decimal point = 2

Figure 3.11 Scaling applied to temperature conversion.

PV_FTIME:

Sets the time constant of the damping function within AI block (primary delay) in seconds.

Alarm Priority:

Indicates the priority of the process alarm. If a value of 3 or greater is set, an alarm is transmitted. The factory default is 0. Four types of alarm can be set: HI_PRI, HI_HI_PRI, LO_PRI, and LO_LO_PRI.

Alarm Threshold:

Sets the threshold at which a process alarm is generated. The factory default setting is a value that does not generate an alarm. Four types of alarm can be set: HI_LIM, HI_HI_LIM, LO_LIM, and LO_LO_LIM.

IM 12A00A01-61E

Equations:

Simulate Convert Cutoff Filter

CHANNEL SIMULATE L_TYPE LOW_CUT PV_FTIME

XD_SCALE Output OUT_SCALE

Mode

Alarms

HI/LO

OUT

FIELD_VAL

Foundation Fieldbus 3-21

3-21

FIELD_VAL = 100 [XD_SCALE]

(channel value - EU@0%)

(EU@100% - EU@0%)

Direct: PV = channel value Indirect: PV = EU@0% + (EU@100% - EU@0%) [OUT_SCALE]

FIELD_VAL

100

Ind Sqr Root: PV = EU@0% + (EU@100% - EU@0%) [OUT_SCALE]

√(FIELD_VAL)

100

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3-22 Foundation Fieldbus

3-4 In-process operation

This chapter describes the procedure performed when changing the operation of the function block of the EXA in process.

3-4-1 Mode Transition

When the function block mode is changed to Out_Of_Service, the function block pauses and a block alarm is issued.

When the function block mode is changed to Manual, the function block suspends updating of output values. In this case alone, it is possible to write a value to the OUT parameter of the block for output. Note that no parameter status can be changed.

3-4-2 Generation of Alarm

3-4-2-1 Indication of Alarm

Figure 3.12 Error Identification on Indicator

3-4-2-2 Alarms and Events

Following alarm or event can be reported by EXA as an alert if allowed.

Analog Alerts

(Generated when a process value exceeds threshold)

By AI1 Block Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm By AI2 Block Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm By AI3 Block Hi-Hi Alarm, Hi Alarm, Low Alarm, Low-Low Alarm

Discrets Alerts

(Generated when an abnormal condition is detected)

By Resource Block Block Alarm, Write Alarm By Transducer Block Block Alarm By AI1 Block Block Alarm By AI2 Block Block Alarm By AI3 Block Block Alarm

Update Alerts

(Generated when a important (restorable) parameter is updated)

By Resource Block Update Event By Transducer Block Update Event By AI1 Block Update Event By AI2 Block Update Event By AI3 Block Update Event

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