Yokogawa M Series User Manual

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User’s Manual

M Series Digital Limit Alarms Communication Functions

IM 77J04J11-01E

1st Edition

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Introduction

This user's manual describes the communication functions of the M Series digital limit alarms (hereinafter simply referred to as M Series) and contains information on how to create communication programs.

Read the manual carefully to understand the communication functions of the M Series.

The M Series have the following communication protocols.

● PC link communication protocol

● MODBUS communication protocol

● Ladder communication protocol

Note that the M Series cannot communicate with a higher-level device with a communication protocol other than these.

You are required to have background knowledge of the communication specifications of higher-level devices, their communication hardware, language used for creating communication programs, and so on.

■ Intended Readers

This manual is intended for people familiar with the functions of the M Series, control engineers and personnel in charge of maintaining instrumentation and control equipment.

■ Related Documents

The following user's manuals all relate to the communication functions of the M Series. Read them as necessary.

● Model MVHK Digital Limit Alarm (DC Input Type) Document number: IM 77J04H31-01E

● Model MVRK Digital Limit Alarm (RTD Input Type) Document number: IM 77J04R31-01E

● Model MVTK Digital Limit Alarm (Thermocouple Input Type) Document number: IM 77J04T31-01E

The user's manuals above describe mounting, wiring, and how to operate the digital limit alarms.

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Documentation Conventions

■ Symbols

The following symbols are used in this manual.

● Symbols Used in the Main Text

CAUTION

Draws attention to information that is essential for understanding the operation and/or features of the product.

TIP

Gives additional information to complement the present topic.

See Also

Gives reference locations for further information on the topic.

■ Description of Displays

(1) Some of the representations of product displays shown in this manual may be exag-

gerated, simplified, or partially omitted for reasons of convenience when explaining them.

(2) Although, figures and illustrations representing the digital limit alarm's displays may

differ from the real displays in regard to the position and/or indicated characters (upper-case or lower-case, for example), the extent of difference does not impair a correct understanding of the functions and the proper operations and monitoring of the system.

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Notices

■ Regarding This User's Manual

(1) This manual should be passed on to the end user. Keep the manual in a safe place. (2) Read this manual carefully to gain a thorough understanding of how to operate this

product before you start using it.

(3) This manual is intended to describe the functions of this product. Yokogawa Electric

Corporation (hereinafter simply referred to as Yokogawa) does not guarantee that these functions are suited to the particular purpose of the user.

(4) Under absolutely no circumstance may the contents of this manual, in part or in whole,

be transcribed or copied without permission.

(5) The contents of this manual are subject to change without prior notice. (6) Every effort has been made to ensure accuracy in the preparation of this manual.

Should any errors or omissions come to your attention however, please contact your nearest Yokogawa representative or our sales office.

iii

■ Regarding Protection, Safety, and Prohibition Against Unauthorized Modification

(1) In order to protect the product and the system controlled by it against damage and

ensure its safe use, be certain to strictly adhere to all of the instructions and precautions relating to safety contained in this document. Yokogawa does not guarantee safety if products are not handled according to these instructions.

(2) The following safety symbols are used on the product and/or in this manual.

● Symbols Used on the Product and in This Manual

CAUTION This symbol on the product indicates that the operator must refer to an explanation in

the user's manual in order to avoid the risk of injury or death of personnel or damage to the instrument. The manual describes how the operator should exercise special care to avoid electric shock or other dangers that may result in injury or loss of life.

Protective Grounding Terminal This symbol indicates that the terminal must be connected to ground prior to operating

the equipment.

Functional Grounding Terminal This symbol indicates that the terminal must be connected to ground prior to operating

the equipment.

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■ Force Majeure

(1) Yokogawa does not make any warranties regarding the product except those men-

tioned in the WARRANTY that is provided separately.

(2) Yokogawa assumes no liability to any party for any loss or damage, direct or indirect,

caused by the use or any unpredictable defect of the product.

(3) Be sure to use the spare parts approved by Yokogawa when replacing parts or

consumables. (4) Modification of the product is strictly prohibited. (5) Reverse engineering such as the disassembly or decompilation of software is strictly

prohibited. (6) No portion of the software supplied by Yokogawa may be transferred, exchanged,

leased or sublet for use by any third party without the prior permission of Yokogawa.

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M Series Digital Limit Alarms Communication Functions

Introduction........................................................................................................... i

Documentation Conventions ...............................................................................ii

Notices .................................................................................................................iii

1. Setup ....................................................................................................... 1-1

1.1 Setup Procedure ............................................................................................. 1-1

1.2 Notes on Setting Parameters ......................................................................... 1-2

2. Communication Specifications.............................................................. 2-1

2.1 RS-485 Communication Specifications ......................................................... 2-1

Toc-1

IM 77J04J11-01E 1st Edition

3. PC Link Communication ........................................................................ 3-1

3.1 Overview.......................................................................................................... 3-1

3.1.1 Configuration of Command ............................................................... 3-2

3.1.2 Configuration of Response ............................................................... 3-3

3.1.3 Response Error Codes ..................................................................... 3-4

3.1.4 Specifying Broadcast ........................................................................ 3-5

3.2 Commands ...................................................................................................... 3-6

3.2.1 List of Commands ............................................................................. 3-6

BRD Reads I relays on a bit-by-bit basis ......................................... 3-7

BWR

Writes data into I relays on a bit-by-bit basis ........................... 3-8

BRR Reads I relays on a bit-by-bit basis in random order ................ 3-9

BRW

Writes data into I relays on a bit-by-bit basis in random order ..

BRS Specifies I relays to be monitored on a bit-by-bit basis ........... 3-11

BRM Monitors I relays on a bit-by-bit basis .................................... 3-12

WRD

Reads D registers and I relays on a word-by-word basis ....... 3-13

WWR

Writes data into D registers and I relays on a word-by-word

basis..................................................................................... 3-14

WRR

Reads D registers and I relays on a word-by-word basis in

random order ........................................................................ 3-15

WRW

Writes data into D registers and I relays on a word-by-word

basis in random order ........................................................... 3-16

WRS

Specifies D registers and I relays to be monitored on a word-

by-word basis ....................................................................... 3-17

WRM

Monitors D registers and I relays on a word-by-word basis.... 3-18

INF Reads the model, range code number, number of alarms and

revision ................................................................................. 3-19

3-10

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4. Ladder Communication.......................................................................... 4-1

5. MODBUS Communication...................................................................... 5-1

Toc-2

3.3 Communication with Higher-level Devices ................................................. 3-20

3.3.1 Example of Communication Program Created Using Visual Basic .. 3-21

3.3.2 Communication with UT Link Module .............................................. 3-25

3.3.3 Communication with Touch Panel ................................................... 3-26

4.1 Overview.......................................................................................................... 4-1

4.2 Commands/Responses at the PLC ................................................................ 4-2

4.2.1 Configuration of Command/Response .............................................. 4-2

4.2.2 Reading Parameters......................................................................... 4-3

4.2.3 Writing Parameters ........................................................................... 4-4

4.2.4 Response Error Codes ..................................................................... 4-5

5.1 Overview.......................................................................................................... 5-1

5.1.1 Configuration of Message ................................................................. 5-2

5.1.2 Specifying D Registers...................................................................... 5-3

5.2 Function Codes ............................................................................................... 5-4

5.2.1 List of Function Codes ...................................................................... 5-4

03 Reads data from multiple D registers ...................................... 5-5

06 Writes data into a D register.................................................... 5-7

08 Performs loop back test .......................................................... 5-9

16 Writes data into multiple D registers ...................................... 5-10

5.2.2 Response Error Codes ................................................................... 5-12

5.2.3 Specifying Broadcast ...................................................................... 5-13

6. Functions and Usage of D Registers ..................................................... 6-1

6.1 Overview of D Registers ................................................................................. 6-1

6.2 Interpretation of D Register Map Table .......................................................... 6-1

6.3 D Register Map Table ...................................................................................... 6-2

6.3.1 Contents of D Registers .................................................................... 6-3

7. Functions and Usage of I Relays ........................................................... 7-1

7.1 Status............................................................................................................... 7-2

Appendix Table of ASCII Codes (Alphanumeric Codes).........................App.-1

Revision Information ............................................................................................ i

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1. Setup

This chapter describes the setup procedure required to use the communication functions (PC link, Ladder and MODBUS) and the communication parameters of the M Series.

1.1 Setup Procedure

Set up the communication functions on the M Series as follows:

Set up the communication function parameters of the M Series. (See section 1.2.)

Connect a higher-level device and a M Series. (See the connection diagram below.)

Create communication programs for the higher-level device to perform communication.

Note: Refer to the documentation of each higher-level device when creating communication programs.

• Connection

PLC

B (+)

A (-)

Terminating resistor

220 Ω 1/4 W

M Series M Series

B (+)

A (-)

B (+)

A (-)

1-1

Terminating resistor

220 Ω 1/4 W

Shielded

JIS Class D grounding (grounding resistance of 100 Ω or less)

PC or PLC

(straight cable)

(RS-232C/RS-485 converter)

RS-232C

ML2

B (+)

A (-)

JIS Class D grounding (grounding resistance of 100 Ω or less)

M Series M Series

B (+)

A (-)

JIS Class D grounding (grounding resistance of 100 Ω or less)

COMCOM

B (+)

A (-)

COMCOM

Terminating resistor

220 Ω 1/4 W

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1.2 Notes on Setting Parameters

This section describes the setting parameters for using the communication functions and their setting ranges.

CAUTION

The details of M Series communication functions need to be the same as those of the communication functions of the higher-level device to be connected. Check the communication parameters of the higher-level device first, then set up those of the M Series.

Table 1-1 Parameters to be Set for Communication Functions

1-2

Parameter Name

Protocol selection Without checksum (0)

Address Baud rate Parity Stop bit Data length

*1: When "Ladder communication" is selected in protocol selection, the data length is fixed to 8.

When "MODBUS communication" is selected, the data length is fixed to 7 for ASCII mode and to 8 for RTU mode.

Symbol

PSL

ADR

BPS

PRI STP DLN

Setting Range

PC link communication

With checksum (1)

MODBUS communication ASCII mode (3)

RTU mode (4)

Ladder (2)Ladder communication

1 to 99

1.2 (0), 2.4 (1), 4.8 (2), 9.6 (3) kbps NON (0), EVN (1), ODD (2)

1, 2

7, 8 (*1)

PC link communication

without checksum

● Protocol selection (PSL)

Set the communication protocol identical to that of the higher-level device to be connected.

Default

(0)

9.6 (3)

EVN (1)

1 8

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● Address number (ADR)

Set the address number of the M Series itself. An address number of 1 to 99 can be assigned in any order. Note that the number of M Series that can be connected to a single communication port is limited to 31.

Example of connecting four M Series to a higher-level device by setting address numbers of 1, 5, 10 and 20

A maximum of 1200 m; up to 31 slave stations

1-3

ADR=1 ADR=20ADR=10ADR=5

● Baud rate (BPS)

Set the baud rate identical to that of the higher-level device to be connected. (Otherwise, proper communication cannot be achieved.) The unit of the baud rate is kbps (kbits per second).

● Parity (PRI)

Set the handling of parity to be carried out when data is sent or received. Set the parity bit state identical to that of the higher-level device to be connected.

● Stop bit (STP)

Set the stop bit identical to that of the higher-level device to be connected.

● Data length (DLN)

Set the data length identical to that of the higher-level device to be connected. (When Ladder or MODBUS communication is selected in protocol selection, the data length is fixed.)

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2. Communication Specifications

The RS-485 communication interface has the PC link communication, Ladder communication and MODBUS communication protocols.

Table 2-1 M Series Communication Specifications

2-1

Communication Hardware Terminal

Communication Protocol Specifications

Maximum Baud Rate

Table 2-2 Types of Devices to be Connected

Connected Device

PC PC, touch panel and PLC

(FA-M3 UT link module)

PLC (sequencer) (FA-M3 ladder communication module)

2-wire RS-485 communication system Two-piece connector on the front panel: 1, 2, 3

PC link communication without checksum PC link communication with checksum MODBUS communication (ASCII mode) MODBUS communication (RTU mode) Ladder communication

9600 bps

Communication Protocol

MODBUS communication PC link communication

Ladder communication

Example of Connected Device

General-purpose PC General-purpose PC, FA-M3

and GP Series

General-purpose PLC (sequencer)

2.1 RS-485 Communication Specifications

Table 2-3 RS-485 Communication Interface

Item

Compliant standard EIA, RS-485 Maximum number of devices to be connected 31 Communication system Synchronization Asynchronous (start-stop)

Maximum communication distance 1200 m Baud rate 1200, 2400, 4800, 9600

2-wire, half duplex

No handshakingCommunication method

Specifications

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3. PC Link Communication

3.1 Overview

The use of PC link communication enables the M Series to communicate with a device such as a PC, graphic panel and FA-M3 UT link module easily. In this communication, you can use such device to read/write data from/into D registers or I relays, both of which are internal registers of the M Series.

A maximum of 1200 m; up to 31 slave stations

3-1

Figure 3-1 Example of Connection for PC Link Communication

Hereafter, PCs etc. are generically called "higher-level devices."

See Also

Chapters 6 and 7 for information on the D registers and I relays.

In PC link communication, a higher-level device identifies each M Series with an address number, which ranges from 01 to 99.

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3.1.1 Configuration of Command

Commands sent from a higher-level device to the M Series consist of the following elements.

3-2

Number of Bytes 1 2 2 1 3 2 1 1

Element STX Address

number

(ADR)

(1) (2) (3) (4) (5) (7) (8) (9)(6)

CPU

number

Time to wait

for response

Command Data

Variable length

Checksum ETX CR

corresponding

to command

(1) STX (Start of Text)

This control code indicates the start of a command. The ASCII code is 02 in hexadecimal.

(2) Address Number (01 to 99)

Adress numbers are used by a higher-level device to identify the M Series at the communication destination. (Identification numbers specific to individual M Series.)

(3) CPU Number

This is fixed to 01.

(4) Time to Wait for Response

This is fixed to 0.

(5) Command (See subsection 3.2.)

This specifies a command to be issued from the higher-level device.

(6) Data Corresponding to Command

This specifies an internal register (D register or I relay), number of data pieces and others.

(7) Checksum

This converts the ASCII codes of texts between the character next to STX and the character immediately before the checksum into hexadecimal values and adds them byte by byte. It then fetches the single lowermost byte of the added results as the checksum.

This column is only required for PC link communication with checksum. PC link communication without checksum does not require this 2-byte space of ASCII code.

(8) ETX (End of Text)

This control code indicates the end of a command string. The ASCII code is 03 in hexadecimal.

(9) CR (Carriage Return)

This control code indicates the end of a command. The ASCII code is 0D in hexadecimal.

CAUTION

The control codes STX, ETX and CR are essential for commands when you create a communication program for PC link communication. Omission of any of them or incorrect order of them results in communication failure.

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3.1.2 Configuration of Response

Responses from the M Series with respect to a command sent from the higher-level device consist of the following elements, which differ depending on the condition of communication; normal or failure.

1) Normal Communication

If communication succeeded, a character string "OK" is returned with the data corresponding to a command.

Number of Bytes Variable length12 22 211

Element STX Address

number

(ADR)

CPU

number

2) In the Event of Failure

If communication failed, a character string "ER" is returned with error codes (EC1 and EC2). (See subsection 3.1.3, "Response Error Codes.")

• No response is returned in case of an error in address number specification or CPU number specification.

• If ETX in a command cannot be received, a response may not be returned.

Note: As a countermeasure, provide a timeout process in the communication functions of the higher-level device or in

communication programs.

Number of Bytes 1 2 2 2 2 2 3 2 1 1

Element STX ER EC1 EC2 Command Checksum ETX CRAddress

number

(ADR)

CPU

number

OK Parameter data Checksum ETX CR

3-3

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3.1.3 Response Error Codes

See Also

3.1.2, "Configuration of Response", for the structure of response in the event of error.

The error codes (EC1) and detailed error codes (EC2) of responses are as follows.

Table 3-1 List of Error Codes EC1

Error Code Meaning Cause(s)

Command error

Out of setpoint range

Out of data count range

• No command exists.

• Command not executable

• No register number exists.

• Invalid specification of bit register (I relay) when it is used on a word basis

• Any character other than 0 or 1 is used for bit setting.

• A value other than 0000 to FFFF has been specified in word specification.

• The position of a start for a data load is out of the address range.

• The specification of the number of bits, words, etc. is out of the range of

use.

• The number of data specified and that of parameters for registers and others are not consistent.

3-4

06 • An attempt was made to execute monitoring without specifying the

43 Internal buffer overflow 44 • The end-of-data or end-of-text character has not been received.

Monitor error

Sum error

Character reception interval timeout

monitor (BRS or WRS).

• An illegal parameter is set. 08 Parameter error

• The sum does not match the expected value. 42

• A data value greater than the specified was received.

Table 3-2 List of Detailed Error Codes EC2

Error Code (EC1)

03 04 05

08 Parameter error • An illegal parameter is set.

Meaning

Detailed Error Code (EC2)

Parameter number where error occurred (HEX) This is the sequence number of a parameter that first resulted in an error when counted from the leading parameter.

e.g.: Register specification error

[STX]01010BRR02I0001,D0001[ETX][CR]

Parameter numbers

[STX]0101ER0303BRR[ETX][CR]

1 2 3

↓

For error codes other than those noted as EC1, there is no EC2 meaning.

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3.1.4 Specifying Broadcast

Broadcast addressing allows the corresponding multiple M Series to receive the command. (1) To use this function, specify BM for the address number in a command. (2) Broadcast addressing works independently of the address number. (3) Broadcast addressing is only applicable to write commands. (4) No response is returned if broadcast addressing is used.

Higher-level device (master)

Broadcast data.

* No response from slaves

A maximum of 1200 m; up to 31 slave stations

3-5

For the M Series communication, D registers and I relays are used.

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3.2 Commands

3.2.1 List of Commands

The following shows lists of commands available in PC link communication. Their details are explained in the description of each command.

(1) Bit-basis Access Commands Dedicated to I Relays

Command Description Number of Bits to be Handled

BRD BWR Bit-basis write 1 to 256 bits

BRR Bit-basis random read BRW Bit-basis random write 1 to 32 bits

BRS Specifies registers to be monitored on a bit-by-bit basis.

BRM

(2) Word-basis Access Commands

Command Description Number of Words to be Handled

WRD

WWR

WRR

WRW

WRS

WRM

Bit-basis read

Bit-basis monitoring

Word-basis read Word-basis write

Word-basis random read Word-basis random write Specifies registers to be monitored on a word-by-word basis. Word-basis monitoring

1 to 256 bits

1 to 32 bits

1 to 64 words 1 to 64 words

1 to 32 words 1 to 32 words 1 to 32 words

3-6

(3) Information Command

Command Description Number of Units to be Handled

INF1Reads model, input range code, number of alarms

and revision.

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BRD Reads I relays on a bit-by-bit basis

● Function

Reads the ON/OFF statuses of a sequence of contiguous I relays by the specified number of bits, starting at a specified I relay number.

• The number of bits to be read at a time is 1 to 256.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 5 1 3 2 1 1

Command

element

STX Address

number

(ADR)

CPU

number

0 BRD ETX CRI relay

number

Comma

or space

Number

of bits

(n)

Checksum

3-7

Number of Bytes

element

Responses 0 and 1 indicate OFF and ON respectively.

dn: read data of the specified number of bits (n=1 to 256)

dn=0 (OFF)

dn=1 (ON)

1 2 2 2111 1 2 1 1

CPU

STX Address

number

(ADR)

number

OK d1 d2 d3 ETX CRResponse

● Example:

Reading the status of alarm 1 of the M Series with address number 01. The following command reads the status of alarm 1 (

[Command]

[STX]01010BRDI0001,00191[ETX][CR]

The following response is returned with respect to the above command. (Alarm 1 is ON.)

[Response]

[STX]0101OK18D[ETX][CR]

• • •

• • • dn Checksum

I0001) of address number 01.

Alarm has been ON since 1 was returned.

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BWR Writes data into I relays on a bit-by-bit basis

● Function

Writes ON/OFF data into a sequence of contiguous I relays by the specified number of bits, starting at a specified I relay number.

• The number of bits to be written into at a time is 1 to 256.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 5 1 3 2 1 1

Command

element

Command (continued)

• • •

• • • dn Checksum ETX

STX Address

number

(ADR)

21CR1

CPU

number

0 BWR d1 d2I relay

number

Comma

or space

Number

of bits

(n)

Comma

or space

3-8

Write data 0 and 1 indicate OFF and ON respectively.

dn: write data of the specified number of bits (n=1 to 256)

dn=0 (OFF)

dn=1 (ON)

Number of Bytes 1 2 2 2 2 1 1

element

STX Address

number

(ADR)

number

CPU

OK ETX CRResponse

Checksum

● Example:

Setting the user-defined flag of the M Series with address number 01 to ON. The following command writes ON into the user-defined flag (

[Command]

[STX]01010BWRI0033,001,106[ETX][CR] Note: The user-defined flags are flags that the user can freely read/write.

OK is returned in response to the above command.

[Response]

I0033) of address number 01.

[STX]0101OK5C[ETX][CR]

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BRR Reads I relays on a bit-by-bit basis in random order

● Function

Reads the ON/OFF statuses of the individuaI I relays specified in random order by the specified number of bits.

• The number of bits to be read at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 5 1

Command

element

Command (continued)

• • •

• • • I relay

STX Address

5211

number n

CPU

number

(ADR)

Checksum ETX CR

number

0 BRR Number

of bits

(n)

I relay

number 1

Comma

or space

I relay

number 2

3-9

Comma

or space

Number of Bytes • • • 112 2211 2 11

OK d1 d2 CR• • • dn Checksum ETX

Response

element

Responses 0 and 1 indicate OFF and ON respectively.

dn: read data of the specified number of bits (n=1 to 32)

dn=0(OFF)

dn=1(ON)

STX Address

number

(ADR)

CPU

number

● Example:

Reading the statuses of alarms 1 and alarm 2 of the M Series with address number 01. The following command reads the statuses of alarm 1 (

address number 01.

[Command]

[STX]01010BRR02I0001,I00027B[ETX][CR]

The ON and OFF responses are returned for alarm1 and alarm 2 respectively with respect to the above command.

[Response]

I0001) and alarm 2 (I0002) of

[STX]0101OK10BD[ETX][CR]

Alarm 1 has been ON.

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BRW Writes data into I relays on a bit-by-bit basis in random order

● Function

Writes ON/OFF data into the individual I relays specified in random order by the specified number of bits.

• The number of bits to be written into at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 1 1

Command

element

Command (continued)

I relay

number 2

STX Address

Comma

or space

number

(ADR)

CPU

number

111

Comma

or space

0BRW d1Number

• • •

• • • Checksumd2 ETX CR

of bits

(n)

I relay

number n

I relay

number 1

Comma

or space

Comma

or space

3-10

Comma

or space

Write data 0 and 1 indicate OFF and ON respectively.

dn: write data of the specified number of bits (n=1 to 32)

dn=0 (OFF)

dn=1 (ON)

Number of Bytes 1 2 2 2 2 1 1

OK CRChecksum ETX

Response

element

STX Address

number

(ADR)

CPU

number

● Example:

Setting the four user-defined flags (I0033, I0034, I0035 and I0036) of the M Series with address number 05 to ON, OFF, OFF and ON respectively.

[Command]

[STX]05010BRW04I0033,1,I0034,0,I0035,0,I0036,17D[ETX][CR] Note: The user-defined flags are flags that the user can freely read/write.

OK is returned in response to the above command.

[Response]

[STX]0501OK60[ETX][CR]

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BRS Specifies I relays to be monitored on a bit-by-bit basis

● Function

Specifies the I-relay numbers to be monitored on a bit-by-bit basis. Note that this command simply specifies I relays. Actual monitoring is performed by the BRM command after the I relay numbers are specified by this command.

When the volume of data is large and you wish to increase the baud rate, it is effective to use a combination of the BRS and BRM commands rather than just the BRR command.

If the power supply is turned off, the specified I-relay numbers will be erased.

• The number of I relays to be specified at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 5 1

Command

element

STX Address

number

(ADR)

CPU

number

BRS Comma

0 Number

of bits

(n)

I relay

number 1

or space

I relay

number 2

3-11

Comma

or space

Command (continued)

• • •

• • • I relay

Response

element

5211

number n

Checksum ETX CR

12 22 2 11Number of Bytes

STX Address

number

(ADR)

CPU

number

OK Checksum ETX CR

● Example:

Specifying that the burnout, alarm 1 and alarm 2 of the M Series with address number 01 are to be monitored.

(This command simply specifies the registers to be monitored.)

[Command]

[STX]01010BRS03I0007,I0001,I0002B9[ETX][CR]

OK is returned in response to the above command.

[Response]

[STX]0101OK5C[ETX][CR]

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BRM Monitors I relays on a bit-by-bit basis

● Function

Reads the ON/OFF statuses of the I relays that have been specified in advance by the BRS command.

• Before executing this command, the BRS command must always be executed to specify which I relays are to be monitored. If no relay has been specified, error code 06 is returned.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 1 1

Command

element

STX 0 BRM ETX CRAddress

number

(ADR)

CPU

number

Checksum

3-12

Number of Bytes 1 2 2 2 1 1 1 1 2 1 1

Response

element

Responses 0 and 1 indicate OFF and ON respectively.

dn: read data of the number of bits specified by the BRS command (n=1 to 32)

dn=0 (OFF)

dn=1 (ON)

STX OK d1 d2 d3 ETX CRAddress

number

(ADR)

CPU

number

• • •

• • • dn Checksum

● Example:

Monitoring the burnout, alarm 1 and alarm 2 of the M Series with address number 01 when they have been specified to be monitored.

(This command reads the statuses of the I relays specified by the BRS command.)

[Command]

[STX]01010BRMA3[ETX][CR]

The ON/OFF statuses of the I relays are returned with respect to the above command.

[Response]

[STX]0101OK000EC[ETX][CR]

All have been OFF.

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WRD Reads D registers and I relays on a word-by-word basis

● Function

Reads a sequence of contiguous register data on a word-by-word basis by the specified number of words, starting at a specified register number.

• The number of words to be read at a time is 1 to 64.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 5 1 2211

Command

element

STX Address

number

(ADR)

CPU

number

Comma

or space

Number

of words

Checksum0 WRD ETX CR

(n)

3-13

Number of Bytes • • •12 2244 4 2 11

Response

element

The response is returned in a 4-digit character string (0000 to FFFF) in hexadecimal.

ddddn: read data of the specified number of words

ddddn is a character string in hexadecimal.

n=1 to 64

STX OK dddd1 dddd2 ETXAddress

number

(ADR)

CPU

number

• • • ddddn Checksum

● Example:

Reading the alarm-1 setpoint (D0101) of the M Series with address number 01.

[Command]

[STX]01010WRDD0101,0172[ETX][CR]

The alarm-1 setpoint 500 (01F4 [HEX]) is returned in response to the above command (50.0 is expressed as 500).

[Response]

[STX]0101OK01F437[ETX][CR]

500 in decimal (Alarm-1 setpoint [A1] is 50.0.)

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WWR Writes data into D registers and I relays on a word-by-word basis

● Function

Writes data into a sequence of contiguous registers on a word-by-word basis by the specified number of words, starting at a specified register number .

• The number of words to be written into at a time is 1 to 64.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.-

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 5 1 2 1 4

Command

element

Command (continued)

4211

dddd2

STX Address

number

(ADR)

• • •

• • • Checksumddddn ETX CR

CPU

number

0 WWR Comma

number

Comma

or space

Number

of words

(n)

or space

3-14

dddd1

Write data is specified in a 4-digit character string (0000 to FFFF) in hexadecimal.

ddddn: write data of the specified number of words

ddddn is a character string in hexadecimal.

n=1 to 64

Number of Bytes 1 2 2 2 2 1 1

OK CRChecksum ETX

Response

element

STX Address

number

(ADR)

CPU

number

● Example:

Writing 200 (00C8 [HEX]) into the alarm-1 setpoint (D0101) of the M Series with address number 03.

[Command]

[STX]03010WWRD0101,01,00C88E[ETX][CR]

OK is returned in response to the above command.

[Response]

[STX]0301OK5E[ETX][CR]

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WRR Reads D registers and I relays on a word-by-word basis in random

order

● Function

Reads the statuses of the individul registers on a word-by-word basis specified in random order by the specified number of words.

• The number of words to be read at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 5 1

Command

element

STX Address

number

(ADR)

CPU

number

0 WRR Number

of words

(n)

number 1

Comma

or space

number 2

Comma

or space

Command (continued)

• • •

Response

element

The response is returned in a 4-digit character string (0000 to FFFF) in hexadecimal.

ddddn: read data of the specified number of words

ddddn is a character string in hexadecimal.

n=1 to 32

5211

number n

1 2 224 4 4 2 11Number of Bytes

STX Address

number

(ADR)

ETX CR• • • Checksum

CPU

number

OK dddd1 dddd2 ETX CR• • • ddddn Checksum

• • •

● Example:

Reading the alarm-1 setpoint (D0101) and alarm-2 setpoint (D0102) of the M Series with address number 01.

[Command]

[STX]01010WRR02D0101,D010288[ETX][CR]

The alarm-1 setpoint 500 (01F4 [HEX]) and alarm-2 setpoint 500 (01F4 [HEX]) are returned with respect to the above command (50.0 is expressed as 500).

[Response]

[STX]0101OK01F401F4FC[ETX][CR]

500 in decimal (Alarm-1 setpoint is 50.0.)

500 in decimal (Alarm-2 setpoint is 50.0.)

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3-16

WRW Writes data into D registers and I relays on a word-by-word basis in

random order

● Function

Writes register data specified for each register into the registers specified in random order by the specified number of words.

• The number of words to be written into at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 4 1

Command

element

STX Address

number

(ADR)

CPU

number

0 WRW dddd1Number

of words

(n)

number 1

Comma

or space

Comma

or space

Command (continued)

number 2

Write data is specified in a 4-digit character string (0000 to FFFF) in hexadecimal.

ddddn: write data of the specified number of words

ddddn is a character string in hexadecimal.

n=1 to 32

Number of Bytes 1 2 2 2 2 1 1

Response

Comma

or space

element

STX Address

number

(ADR)

• • •

• • • Checksumdddd2 ETX CR

CPU

number

51 11

number n

OK CRChecksum ETX

Comma

or space

ddddn

● Example:

Writing 20.0 and 15.0 into the alarm-1 setpoint (D0101) and alarm-2 setpoint (D0102) of the M Series with address number 10 respectively.

[Command]

[STX]10010WRW02D0101,00C8,D0102,00968F[ETX][CR]

200 in decimal (Alarm-1 setpoint is 20.0.)

150 in decimal (Alarm-2 setpoint is 150.0.)

OK is returned in response to the above command.

[Response]

[STX]1001OK5C[ETX][CR]

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3-17

WRS Specifies D registers and I relays to be monitored on a word-by-word

basis

● Function

Specifies the register numbers to be monitored on a word-by-word basis. Note that this command simply specifies the registers. Actual monitoring is performed by the WRM command after the register numbers are specified by this command.

When the volume of data is large and you wish to increase the baud rate, it is effective to use a combination of the WRS and WRM commands rather than just the WRR command.

If the power supply is turned off, the specified register numbers will be erased.

• The number of words to be specified at a time is 1 to 32.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 5 1 5 1

Command

element

Command (continued)

• • •

element

STX Address

5211

number n

STX Address

12 222 11Number of Bytes

number

(ADR)

number

(ADR)

CPU

number

ETX CR• • • Checksum

CPU

number

0 WRS

OK Checksum

Number of words

number 1

(n)

ETX CRResponse

Comma

or space

number 2

Comma

or space

● Example:

Specifying that the alarm-1 setpoint and alarm-2 setpoint of the M Series with address number 01 are to be monitored

(This command simply specifies the registers to be monitored.)

[Command]

[STX]01010WRS02D0101,D010289[ETX][CR]

CPU number: 01 D register numbers

OK is returned in response to the above command.

[Response]

[STX]0101OK5C[ETX][CR]

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WRM Monitors D registers and I relays on a word-by-word basis

● Function

Reads the register data that have been specified in advance by the WRS command.

• Before executing this command, the WRS command must always be executed to specify which registers are to be monitored. If no register has been specified, error code 06 is generated.

• For the format of response in the event of failure, see subsection 3.1.2.

• The command shown below includes the checksum function.

When performing communication without checksum, do not include the 2-byte checksum element in the command.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 2 1 1

Command

element

STX Address

number

(ADR)

CPU

number

Checksum0 WRM ETX CR

3-18

Number of Bytes

Response

element

The response is returned in a 4-digit character string (0000 to FFFF) in hexadecimal.

ddddn: read data of the number of words specified by the WRS command

ddddn is a character string in hexadecimal.

n=1 to 32

12 2244 4 2 11

STX OK dddd1 dddd2 ETX CRAddress

number

(ADR)

CPU

number

• • •

• • • ddddn Checksum

● Example:

Monitoring the alarm-1 setpoint (D0101) and alarm-2 setpoint (D0102) of the M Series with address number 01.

(This command reads the registers specified by the WRS command.)

[Command]

[STX]01010WRME8[ETX][CR]

CPU number: 01

The alarm-1 setpoint 500 (01F4 [HEX]) and alarm-2 setpoint 500 (01F4 [HEX]) are returned with respect to the above command (50.0 is expressed as 500).

[Response]

[STX]0101OK01F401F412[ETX][CR]

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3-19

INF Reads the model, range code number, number of alarms and revision

● Function

Returns the model, range code number, number of alarms and revision of the M Series.

• For the format of response in the event of failure, see subsection 3.1.2.

● Command/Response (for normal operation)

Number of Bytes 1 2 2 1 3 1 2 1 1

Command

element

Number of Bytes 1 2 2 2 8 8 4 4

Response

element

Response (continued)

44211

specified for

write

refreshing *

STX Address

number

(ADR)

STX Start register

Address

number

(ADR)

Number of

registers

specified for

write

refreshing *

CPU

number

CPU

number

Checksum

time (0)

OK 䊐䊐䊐䊐䊐䊐䊐䊐

ETX CRStart register

INF 6 ETX CR

(Note 1)

ChecksumResponse

Version

Revision

(Note 2)

specified for

readout

refreshing *

Number of

registers

specified for

readout

refreshing *

The * mark indicates fields the FA-M3 UT link module refers to.

Note 1: Model and input/output information of the M Series

Model information MVHK: Digital limit alarm (DC input type)

MVRK: Digital limit alarm (RTD input type) MVTK: Digital limit alarm (Thermocouple input type)

Space

Range code number Value set in the parameter IN

Number of alarms 2: 2 points of alarm outputs

4: 4 points of alarm outputs

Note 2: Version number and revision number

Revision number of downloaded data

ROM version number

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3.3 Communication with Higher-level Devices

Higher-level devices are those capable of using the PC link communication protocol. As an example of a communication program, the Basic program created using Microsoft Visual Basic is given in subsection 3.3.1. Further, communications with an FA-M3 UT link module or touch panel can be achieved without creating a complex program. Examples of communication with them are given in subsections 3.3.2 and

3.3.3.

3-20

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3-21

3.3.1 Example of Communication Program Created Using Visual Basic

This subsection shows a sample program created using Microsoft Visual Basic 6.0. Operation verification environment: PC/AT compatible machine + Windows NT 4.0

(SP4), Windows 95

PC/AT is a product of IBM Corporation. Visual Basic is a registered trademark of Microsoft Corporation.

See Also

MSDN and commercially available documentation for information on Visual Basic programming.

The sample program reads the contents of D register D0002 using the PC link communication protocol. When you press the Command button, the commands sent and responses received will be displayed in a form. If no response is received, a timeout will occur.

'========================================================== ' Program name: Sample ' ' RS-485 communication program for M series ' '============================= YOKOGAWA Electric Corporation === ' 'Definition of public variables Public fSend As Boolean 'Sending flag Public strSend As String 'Character string sent Public strBuf1 As String 'Character (1 byte) received Public strReceive As String 'Character string received

'When the Command button is pressed, Private Sub Command1_Click()

strSend = "01010WRDD0002,01" 'Character string to be sent

'[stx]01010WRDD0002,01[etx][cr]

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Label1.Caption = "[stx]" + strSend + "[etx][cr]" Label2.Caption = ""

MSComm1.PortOpen = True 'Open port Timer1.Enabled = True 'Start timer for detecting timeout Command1.Enabled = False 'Disable the Command button temporarily fSend = True 'Set sending flag

'Send MSComm1.Output = Chr(&H2) + strSend + Chr(&H3) + Chr(&HD)

'Send with stx, etx, and cr added

Do 'Loop until sending flag becomes false

If DoEvents() = 0 Then ' End If '

Loop Until fSend = False '

Timer1.Enabled = False 'Stop Timer 1 MSComm1.PortOpen = False 'Close port

3-22

Label2.Caption = strReceive 'Display received character string in Label 2 Command1.Enabled = True 'Enable the Command button

End Sub

--------------------------------------------------------------------------------

'At start of program Private Sub Form_Load()

Form1.Caption = "Communication Sample"

'Set up timer for detecting timeout Timer1.Enabled = False Timer1.Interval = 2000

'Regard as being 2 seconds 'Initialize MSComm control MSComm1.CommPort = 1 'COM1 MSComm1.InputLen = 1 'Size of receiving buffer MSComm1.InputMode = comInputModeText 'Receiving mode MSComm1.RThreshold = 1 'MSComm1_OnComm interrupt processing starts

'each time 1 byte is received MSComm1.Settings = "9600,e,8,1" 'Communication conditions: 9600 bps; Parity,

'even; Data length, 8 bits; Stop bit, 1 bit

'Command button control Command1.Caption = "Send"

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'Initialize label control that displays character strings sent and received Label1.Caption = "" Label2.Caption = ""

End Sub

--------------------------------------------------------------------------------

'This processing starts each time 1 byte is received Private Sub MSComm1_OnComm() Dim strBuf0 As String

Select Case MSComm1.CommEvent

Case comEvReceive

strBuf0 = MSComm1.Input ' Select Case strBuf0 'Case classification based on 1 byte received Case Chr(2) 'When it is stx

strBuf1 = "[stx]"

Case Chr(3) 'When it is etx

strBuf1 = strBuf1 & "[etx]"

Case Chr(13) 'When it is cr

strBuf1 = strBuf1 & "[cr]" 'This is provided as a measure against the fact that a command sent may 'be seen as response depending on a combination with communication 'converter.

3-23

If strBuf1 = Label1.Caption Then

strBuf1 = ""

Else

strReceive = strBuf1 'Completion of character string received fSend = False 'Receiving is regarded as being ended

End If

Case Else 'When it is not stx, etx, or cr

strBuf1 = strBuf1 & strBuf0

End Select Case Else End Select

End Sub

--------------------------------------------------------------------------------

'Timeout Private Sub Timer1_Timer()

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strReceive = "Time Out!" fSend = False 'Receiving is regarded as being ended

End Sub

3-24

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3.3.2 Communication with UT Link Module

Communication with FA-M3 is achieved by simply connecting the M Series to a UT link module using the PC link communication protocol. Set the communication conditions of the M Series identical to those of the UT link module.

Model of UT link module: F3LC51-2N

FA-M3

A maximum of 1200 m; up to 31 slave stations

The UT link module supports the following two types of communication modes and command communication, which allow you to communicate with FA-M3 without being aware of it. For more information, see the optionally available "UT Link Module User's Manual (IM 34M6H25-01E)."

3-25

1. Automatic mode This mode enables the instrument's fixed devices (those that cannot be specified by

the user) to be constantly refreshed by reading from them. The fixed devices are D0001 to D0004. They are read-only areas and cannot be written into.

2. Manual mode This mode enables the instrument's devices (those that can be specified by the user)

to be constantly refreshed by reading from and/or writing into them.

See Also

The devices mentioned here are D registers and I relays. For more information on D registers and I relays, see Chapters 6 and 7.

3. Command communication Command communication allows the user to communicate with instruments as and

when required.

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3.3.3 Communication with Touch Panel

Communication with a touch panel is achieved using the PC link communication protocol. Set the communication conditions of the M Series identical to those of the touch panel.

Graphic panel

A maximum of 1200 m; up to 31 slave stations

For more information, refer to the user's manual of the touch panel to be connected.

3-26

Model Name Remarks

Yokogawa TOP75T Touch operation panel (large) 10-inch

TOP72S

Digital’s Pro-face

Note 1: For Digital's graphic panels, contact Digital Corp. directly. Note 2: The system data area should be assigned to D0450. *1: Display devices differ depending on the model.

GP70 Series Graphic operation panel GP-J Series High-speed graphic operation panel GP-230 Series Medium-size graphic operation panel GP-430 Series High-speed, advanced graphic operation GP-530 Series

Touch operation panel (medium) 5-inch

panels

TFT color LCD

STN color LCD

(*1)

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4. Ladder Communication

4.1 Overview

The use of Ladder communication enables the M Series to communicate with a sequencer (PLC). By specifying the register numbers of D registers of the M Series as parameters in the ladder program, you can read/write data from/into the registers using BCD codes (0 to 9).

Ladder communication module

PLC

A maximum of 1200 m; up to 31 slave stations

4-1

Figure 4-1 Example of Connection for Ladder Communication

● Connecting the M Series to a PLC of another company

When the M Series are connected to a PLC manufactured by Mitsubishi Electric (MELSECA series), you can use the no-handshaking mode of the computer link unit.

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4.2 Commands/Responses at the PLC

The PLC sends commands and receives responses to these commands. The commands and responses that can be used are as follows.

4.2.1 Configuration of Command/Response

Commands sent from the PLC to the M Series and responses from the M Series with respect to a command sent from the PLC consist of the following elements.

Number of Bytes 1 1 221111

Number of BCD Digits 2 2 1 4422111

Command/Response

element

(1) Address Number (01 to 99)

Address numbers are used by the PLC to identify the M Series at the communication destination. (Identification numbers specific to individual M Series.)

Address

number

(ADR)

(1) (2) (3) (4) (5) (7) (8) (9)(6)

number

CPU

Parameter

number

0 R/W +/-0 Data

Can be changed only during a read operation. A maximum of 64 data items

4-2

(0D)LF(0A)

(2) CPU Number

This is fixed to 01.

(3) Parameter Number

This is 4-digit BCD data of a D register number with its leading character D removed. I relays cannot be specified.

See Also

Chapter 6 for more information on D registers.

(4) 0

This is fixed to 0.

(5) 0

This is fixed to 0.

(6) R/W

0: Read 1: Write

(7) +/-

0: Positive data (+) 1: Negative data (-)

(8) Data

For read operation, this is the number of data items to be read. For write operation, it is the setting data.

(9) CR and LF

These control codes indicate the end of a command. The corresponding control character strings for CR and LF are 0D and 0A in hexadecimal in ASCII code, respectively.

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4.2.2 Reading Parameters

Shown below are the configurations of commands and responses when parameters in the M Series are read by the PLC. (The maximum number of data items to be read is 64.)

● Command/Response

Number of Bytes 1 1 221111

Number of BCD Digits 2 2 1 4422111

Command element Address

number

(ADR)

number

CPU

Parameter

number

0000 Number of

read data

(n)

(0D)LF(0A)

4-3

Number of Bytes 1 1 2

Number of BCD Digits 2 2 4

Parameter

Response element Address

number

(ADR)

CPU

number

• • •

number

Data of parameter number (n)

● Example:

Reading the input value (D0003) of the M Series with address number 01.

[Command]

01010003000000010D0A

The input value 500 (BCD code) is returned with respect to the above command (50.0 is expressed as 500).

211

14111

00+/-0 dddd1

Data of parameter number (a) Data of parameter number (b)

21111

1422111

00+/-0 ddddn

(0D)LF(0A)

14111

00+/-0 dddd2

211

[Response]

01010003000005000D0A

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4.2.3 Writing Parameters

Shown below are the configurations of commands and responses when the parameters are written into the M Series from the PLC.

● Command/Response

Number of Bytes 1 1 221111

Number of BCD Digits 2 2 1 4422111

Command element Address

Number of Bytes 1 1 221111

Number of BCD Digits 2 2 1 4422111

Response element Address

number

(ADR)

number

(ADR)

number

● Example:

CPU

Parameter

number

Parameter

number

01+/-0 dddd

4-4

(0D)LF(0A)

Writing 200 into the alarm-1 setpoint (D0101) of the M Series with address number 01.

[Command]

01010101001002000D0A

The alarm-1 setpoint 200 (BCD code) is returned with respect to the above command (20.0 is expressed as 200).

[Response]

01010101001002000D0A

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4.2.4 Response Error Codes

Data that the master station (PLC) will receive in the event of an error and the description of errors are given in the table below.

0101/0103/0000/0001/CR/LF

Read/write data

0, 0, R/W, and +/-

Parameter number

Address number and CPU number

Note: Slashes (/) in the following send and receive data examples are used for explanatory purposes only, and are not part of

the actual data string.

Table 4-2 List of Error Codes

4-5

Description of Error

A non-existent parameter was set. 0101/0451/0000/0001/CR/LF 0101/0451/0000/FFFF/CR/LF

were used other than in an address number.

* This excludes LF (0A).

an address number.

An address differed from the address numbers of the M Series.

* In the example at right, none of the address numbers exist.

data) is incorrect.

* The command length, including CR and LF, must be 10 bytes.

* Timeout is 2 seconds.

The buffer overflowed.

* This error occurs when the buffer overflow exceeds 368 bytes.

Example of Data Sent

by Master Station

0101/0420/0000/000B/CR/LF 0101/0420/000B/0000/CR/LF 0101/0420/0B00/0000/CR/LF 0101/042B/0000/0000/CR/LF

0101/0420/0000/000A/CR/LF 0101/0420/000A/0000/CR/LF 0101/0420/0A00/0000/CR/LF 0101/040A/0000/0000/CR/LF

0103/0420/0000/0000/CR/LF 0001/0420/0000/0000/CR/LF 3301/0420/0000/0000/CR/LF

0101/0420/0000/00/CR/LF 0101/0420/0/CR/LF 0101/0/CR/LF

0101/012 No responseA timeout occurred during communication.

–

–A framing error or a parity error occurred. No response

0101/FFFF/FFFF/FFFF/CR/LFCharacters other than a BCD code (0 to 9)

No responseAn LF code (0A) was used other than in

No response

No responseThe command length (length of the send

No response

Data Received

by Master Station

FFFF is returned.

CAUTION

If a parameter not existing in the D register table is read, an error will not occur. In this case, 0 will be returned instead.

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5. MODBUS Communication

5.1 Overview

The use of MODBUS communication enables the M Series to communicate with a PC. In this communication, you can use a PC to read/write data from/into D registers, which are internal registers of the M Series.

A maximum of 1200 m; up to 31 slave stations

5-1

Figure 5-1 Example of Connection for MODBUS Communication

Hereafter, PCs are generically called "higher-level devices."

See Also

Chapter 6 for information on the D registers.

For the MODBUS communication of the M Series, two transmission modes are supported: ASCII mode and RTU mode (binary system).

Table 5-1 ASCII and RTU Modes

Item ASCII Mode RTU Mode

Number of data bits 7 bits (ASCII) 8 bits (binary) Message start mark Message end mark Message length (*1) Data time intervals 1 second or less 24 bit time or less (*2) Error detection

*1: When the message length in the RTU mode is assumed to be "N." *2: When the baud rate is 9600 bps, 1⫼9600⫻24 seconds or less applies.

: (colon) Not necessary CR+LF Not necessary 2N+1 N

Longitudinal redundancy check: LRC Cyclic redundancy check: CRC-16

In MODBUS communication, a higher-level device identifies each M Series with an address number, which ranges from 01 to 99.

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5.1.1 Configuration of Message

Messages sent from a higher-level device to the M Series consist of the following elements.

5-2

Element Address

Number of bytes in RTU mode None

Number of bytes in ASCII mode 2 2

Message Mark

None

1224n

(1) (3) (4) (5)(2) (6)

Number

(ADR)

1 1 2n 2

Function CodeStart of

Data Error Check End of

Message Mark

(1) Start of Message Mark

This mark indicates the start of a message. Note that only ASCII mode requires a colon (:).

(2) Address Number (01 to 99)

Address numbers are used by a higher-level device to identify the M Series at the communication destination. (Identification numbers specific to individual M Series, which is expressed in hexadecimal in the message.)

(3) Function Code (See subsection 5.2.1, "List of Function Codes.")

This specifies a command (function code) from the higher-level device.

(4) Data

This specifies D register numbers, the number of D registers, parameter values, or others in accordance with the function code. (It is expressed in hexadecimal in the message.)

(5) Error Check

In RTU mode : Carried out by the cyclic redundancy check (CRC-16) system. In ASCII mode : Carried out by the longitudinal redundancy check (LRC) system.

(6) End of Message Mark

This mark indicates the end of a message. Note that only ASCII mode requires CR + LF.

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5.1.2 Specifying D Registers

When you use a commercially available SCADA or the like or a user-created communication program, you must be careful when specifying D register numbers contained in messages because in both cases, you cannot use the original D register numbers as they are.

1) When using a commercially available SCADA or the like, specify D register numbers by changing them into reference numbers. To change them into a reference number, replace the D register number's leading character "D" with "4."

2) In a user-created communication program, specify a D register using the hexadecimal number of the value obtained by subtracting "40001" from the D register's reference number. (Specify this hexadecimal number.)

Example: Specifying a value (alarm-1 setpoint [D0101])

1) For a messages using commercially available SCADA or the like, specify reference number "40101."

2) For a messages in a user-created communication program, specify "0064," the hexadecimal number of "100 ," which is obtained by subtracting 40001 from the reference number.

5-3

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5.2 Function Codes

5.2.1 List of Function Codes

Function codes are command words used by the higher-level device to obtain the D register data of the M Series.

Table 5-2 List of Function Codes

5-4

Code Number

03 Reads data from multiple

06 Writes data into a register. Capable of writing data into one register.

16 Capable of writing data into a maximum of 64 successive

registers.

Performs loop back test.08 Used to check the connection for communication.

Writes data into multiple registers.

Function Description

Capable of reading data from a maximum of 64 successive registers.

registers.

• The write function codes will not write into read-only or disabled registers.

• Broadcast addressing is possible with function codes 06 and 16 only. (Also in this

case, read-only or disabled registers will not be written into.)

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03 Reads data from multiple D registers

● Function

Reads the contents of a sequence of contiguous D registers by the specified number of D registers, starting at a specified D register number.

• The maximum number of D registers to be read at a time is 64.

• For the format of response in the event of failure, see subsection 5.2.2.

● Message (for normal operation)

5-5

Element Start of

Number of bytes in RTU mode Number of bytes in ASCII mode

Message (continued)

Error

Check

End of Message

Mark (CR+LF)

2 22

None

Address

Message Mark

(:)

None 1 1 2

Number

(ADR)

Function

Code (03)

D-Register

Start Number

4122

● Response (for normal operation)

Element Start of

Number of bytes in RTU mode None 1 1 1 2

Response (continued)

• • •

Contents of

D Register

Message Mark

Error

Check

(:)

12 224Number of bytes in ASCII mode

End of Message

Mark (CR+LF)

None22

Address

Number

(ADR)

224

Function

Code (03)

Byte

Count

Number of

D Registers

2 4

Contents of

D Register

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● Example:

Reading the statuses of alarm-1 and alarm-2 setpoints of the M Series with address number 01.

The following message reads two successive D registers starting at alarm-1 setpoint (D0101) of address number 01 in the ASCII mode.

[Message]

: 01030064000296[CR][LF]

Start of message mark

"01": address number 01, "03": function code 03, "0064": D-register start number 0101, "0002": number of D registers 2, and "96": error check

Note: The numbers in quotation marks are hexadecimal.

The following response is returned with respect to the above message.

[Response]

: 01030400010000F7[CR][LF]

Alarm-1 setpoint is 1. Alarm-2 setpoint is 0.

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06 Writes data into a D register

● Function

Writes data into a specified D register.

• The maximum number of D registers to be written into at a time is 1.

• For the format of response in the event of failure, see subsection 5.2.2.

• Broadcast addressing is possible by setting 00 in the address number.

● Message (for normal operation)

5-7

Element Start of

Number of bytes in RTU mode None 1 1 1

Message (continued)

Write Data

(Upper Digit)

1 2

Write Data

(Lower Digit)

1 2

Message Mark

(:)

Error

Check

2 2

Address

Number

(ADR)

22 2

End of Message

Mark (CR+LF)

None

Function

Code (06)

D-Register

Number

(Upper Digit)

1 2Number of bytes in ASCII mode

● Response (for normal operation)

Element Start of

Number of bytes in RTU mode None 1 1 1

Response (continued)

Write Data

(Upper Digit)

Write Data

(Lower Digit)

Message Mark

(:)

Error

Check

Address

Number

(ADR)

22 2

End of Message

Mark (CR+LF)

Function

Code (06)

D-Register

Number

(Upper Digit)

1 2Number of bytes in ASCII mode

D-Register

Number

(Lower Digit)

D-Register

Number

(Lower Digit)

1 2

2 2

None

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● Example:

Setting 70.00 into the alarms-1 setpoint of the M Series with address number 01. The following message writes 70.00 into the alarms-1 setpoint (D0101) of address number

01 in the ASCII mode.

[Message]

: 010600641B5822[CR][LF]

Start of message mark

"01": address number 01, "06": function code 06, "0064": D-register number 0101, "1B58": data 70.00, and "22": error check

Note: The numbers in quotation marks are hexadecimal.

The following response is returned with respect to the above message.

[Response]

: 010600641B5822[CR][LF]

Alarm-1 setpoint is 70.00.

5-8

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08 Performs loop back test

● Function

This function code is used to check the connection for communication.

• For the format of response in the event of failure, see subsection 5.2.2.

• The element marked with * is "00" (fixed).

• Any value can be selected for send data.

● Message (for normal operation)

5-9

Element Function

Number of bytes in RTU mode Number of bytes in ASCII mode

Message (continued)

Error

Check

End of Message

Mark (CR+LF)

None2

Start of

Message Mark

(:)

● Response (for normal operation)

Element Function

Number of bytes in RTU mode Number of bytes in ASCII mode

Response (continued)

Error

Check

End of Message

Mark (CR+LF)

None2

Start of

Message Mark

(:)

Address Number

(ADR)

Address Number

(ADR)

Code (08)

00*

0000

211None 4221

0000

211None 4221

Send Data

(any)

2 4

Same as

send data

2 4

● Example:

Sending data 1234 (HEX) to the M Series with address number 01 to check connection for communication.

The following message sends 1234 (HEX) to address number 01 in the ASCII mode.

[Message]

: 010800001234B1[CR][LF]

Start of message mark

When the connection for communication is normal, the response whose configuration is the same as that of the message is returned with respect to the above message.

[Response]

: 010800001234B1[CR][LF]

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16 Writes data into multiple D registers

● Function

Writes data into a sequence of contiguous D registers by the specified number of D registers, starting at a specified D register number.

• The maximum number of D registers to be written into at a time is 32.

• For the format of response in the event of failure, see subsection 5.2.2.

• Broadcast addressing is possible by setting 00 in the address number.

● Message (for normal operation)

5-10

Element Start of

Number of bytes in RTU mode None 1 1 1

Message (continued)

Number of

D Registers

(Upper Digit)

1 2

Number of

D Registers

(Lower Digit)

1 2

Message Mark

(:)

Byte

Count

(Upper Digit)

1 2

Data

Address

Number

(ADR)

22 2

(Lower Digit)

1 2

Function

Code (10)

Data

1 2

• • •

D-Register Start Number (Upper Digit)

1 2Number of bytes in ASCII mode

Error

Check

2 2

● Response (for normal operation)

Element Start of

Number of bytes in RTU mode None 1 1 1

Response (continued)

Number of

D Registers

(Upper Digit)

1 2

Number of

D Registers

(Lower Digit)

1 2

Message Mark

(:)

Error

Check

End of Message

Mark (CR+LF)

2 2

Address

Number

(ADR)

22 2

None

Function

Code (10)

D-Register Start Number (Upper Digit)

1 2Number of bytes in ASCII mode

D-Register Start Number (Lower Digit)

End of Message

Mark (CR+LF)

None

D-Register Start Number (Lower Digit)

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● Example:

Setting 200, 10 and 3 into the alarms-1 setpoint, alarm-2 setpoint and alarm-3 setpoint of the M Series with address number 02, respectively.

The following message writes 200, 10 and 3 in this order in the ASCII mode, starting at the alarm-1 setpoint (D0101) of address number 02 .

[Message]

: 0210006400030600C8000A0003AC[CR][LF]

Start of message mark

"02": address number 02, "10": function code 16, "0064": D-register start number 0101, "0003": number of D registers 3, "06": byte count, "00C8": alarm-1 setpoint 200, "000A": alarm-2 setpoint 10, "0003": alarm-3 setpoint 3, and "AC": error check

Note: The numbers in quotation marks are hexadecimal.

The following response is returned with respect to the above message.

[Response]

: 02100064000387[CR][LF]

The number of registers is 3.

5-11

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5.2.2 Response Error Codes

● Message Format in the Event of Error

If there are any inconsistencies other than communication errors in a message, the M Series does nothing, but returns the following message.

5-12

Element Function Code

Number of bytes in RTU mode Number of bytes in ASCII mode 2

*1: In this case, a value of [function code (hexadecimal number) + number 80 (hexadecimal number)] is set.

Address Number

(ADR)

1 2

(*1)

1 2

Error Code Error Check [CR] [LF]

1 2

● Response Error Codes

Table 5-3 List of Error Codes

Error Code Meaning Cause

02 D-register number error

03 D-register count error

Function code error

No such function code exists.

Specified D register number is out of the range.

Specified number of D registers is out of the range.

● Even when a message is sent, no response returns if:

• Retransmission error (overrun, framing, parity, LRC, or CRC-16 error) was detected.

• Address in a command message is incorrect.

• Interval between data composing a message was 2 seconds or more.

None

• CRC-16 or LRC values are incorrect.

• Broadcase is specified (address number: 00).

Note: As a countermeasure, provide a timeout process in the communication functions of a higher-level device or in the

communication program.

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5.2.3 Specifying Broadcast

Broadcast addressing allows the corresponding multiple M Series to receive the command. (1) To use this function, specify 00 in the address number. (2) Broadcast addressing works independently of the address number. (3) Broadcast addressing is only applicable to write commands. (4) No response is returned if broadcast addressing is used.

Higher-level device (master)

Broadcast data.

* No response from slaves

A maximum of 1200 m; up to 31 slave stations

5-13

For the M Series communication, D registers are used.

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6. Functions and Usage of D Registers

6.1 Overview of D Registers

This section describes the functions and usage of D registers. The D registers store the input and output values, statuses and others that are

handled by the M Series. By connecting M Series to higher-level device capable of PC link communication, Ladder communication or MODBUS communication, you can readily use these internal data items by reading from or writing into the D registers.

6.2 Interpretation of D Register Map Table

This section explains how to read D Register Map tables in this chapter. The numbers listed in the leftmost column are D register numbers ((1) below). The five-digit numbers in the next column are reference numbers used for MODBUS communication ((2) below). The numbers in the column third from left are register numbers in hexadecimal used in MODBUS communication programs ((3) below).

6-1

D-Register Data Area

D-Reg No. Ref No. H No. Description R/W

D0001 40001 0000

(1) D register number

(2) Reference number (for MODBUS communication)

(3) Hex number (for MODBUS communication)

Status R

Permission of read/write by communication

: Indicates that the number of writing actions is limited to 100,000.

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6.3 D Register Map Table

D-Register Data Area

D-Reg No. D0001 D0002 D0003 D0004 D0005 to D0100 D0101 D0102 D0103 D0104 D0105 D0106 D0107 D0108 D0109 D0110 D0 111 D0112 D0113 D0114 D0115 D0116 D0117 to D0200 D0201 D0202 D0203 D0204 D0205 D0206 to D0209 D0210 D0211 D0212 D0213 D0214 D0215 D0216 to D0300 D0301 D0302 D0303 D0304 D0305 D0306 D0307 to D0308 D0309 D0310 D0311 D0312 D0313 to D0400 D0401 to D0450

*1: User area applies when a graphic panel manufactured by Digital Corp. is used.

Ref No. 40001 40002 40003 40004

40101 40102 40103 40104 40105 40106 40107 40108 40109 40110 40 111 40112 40113 40114 40115 40116

40201 40202 40203 40204 40205

40210 40211 40212 40213 40214 40215

40301 40302 40303 40304 40305 40306

40309 40310 40311 40312

40401 to 40450

: The number of writing actions is limited to 100,000.

H No. 0000 0001 0002 0003

0064 0065 0066 0067 0068 0069 006A 006B 006C 006D 006E 006F 0070 0071 0072 0073

00C8 00C9 00CA 00CB 00CC

00D1 00D2 00D3 00D4 00D5 00D6

012C 012D 012E 012F 0130 0131

0134 0135 0136 0137

0190 to 01C1

Status Alarm status Input value (display value) Input unit

Alarm-1 setpoint (A1) Alarm-2 setpoint (A2) Alarm-3 setpoint (A3) Alarm-4 setpoint (A4) Alarm-1 action (AL1) Alarm-2 action (AL2) Alarm-3 action (AL3) Alarm-4 action (AL4) Alarm-1 hysteresis (HY1) Alarm-2 hysteresis (HY2) Alarm-3 hysteresis (HY3) Alarm-4 hysteresis (HY4) Alarm ON delay (OND) Alarm OFF delay (OFD) Setpoint (SP) Keylock (LOC)

Bias (BS) Economical mode (ECO) Burnout action (BSL) Wiring resistance correction (WIR) RJC sensor (RJC)

Communication protocol (PSL) Address number (ADR) Baud rate (BPS) Parity (PRI) Stop bit (STP) Data length (DLN)

Range code number (IN) Maximum measured input value (RH) Minimum measrued input value (RL) Decimal point position of scaling value (SDP) Maximum scaling value (SH) Minimum scaling value (SL)

Input adjustment point LOW (BL) Input adjustment LOW (AL) Input adjustment point HIGH (BH) Input adjustment HIGH (AH)

User area *1

Description

6-2

R/W

R R R R

R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W

R/W R/W R/W

R/W

R/W R/W R/W R/W R/W R/W

R R R R

R/W

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6.3.1 Contents of D Registers

● D0001: Bit configuration of status

The D0001 register represents errors and parameter data by a combination of bits in the register.

In the table below, if any of the events shown occurs, the corresponding bit is set to "1." The bit remains set to "0" if the event has not occurred yet. Note that blank fields indicate bits not used, which are in "0."

Bit Description

0 Alarm-1 status 1 Alarm-2 status 2 3 4 Input exceeding high limit 5 Input falling below low limit 6 Burnout 7 8 9 EEP sum error 10 Parameter error 11 12 13 RJC error 14 EEP error 15

6-3

● D0002: Bit configuration of alarm status

Bit Description

0 Alarm-1 status 1 Alarm-2 status 2 3 4 Alarm-3 status 5 Alarm-4 status 6 to 15

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● D0003: INPUT (Input value: display value)

● D0004: IN UNIT (Input unit)

UnitD0004 value Model

H'0000 H'0003 H'0004

No unit

degC

MVHK MVTK, MVRK MVTK, MVRK

6-4

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7. Functions and Usage of I Relays

This chapter describes the functions and usage of the I relays. The I relays store information on errors, alarm statuses and others of the M Series.

The higher-level device can read data from I relays or write data into I relays using PC link communication.

7-1

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7.1 Status

The following table shows how the I relays are classified.

I-Relay No. Type of Status Description

1 to 16 Error information (same contents as those of D0001) 17 to 32 33 to 64

CAUTION

• The I relays numbered 1 to 32 store ON/OFF statuses. Generally, this area can be accessed to read the ON/OFF statuses.

• When specifying an I relay number via communication, begin the number with an upper-case letter I. For example, type I0001 to specify the alarm-1 status (I relay number: 1).

• No data may be written into or read from data storage areas with blank fields in the table below. If you attempt to do so, the M Series may fail to operate normally.

ON/OFF

Alarm status (same contents as those of D0002) User area (that is used in some devices such as

graphic panels)

7-2

I-Relay No.

1 2

3 4 5

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 to 32 33 to 64

I-Relay Area

Description

Alarm-1 status Alarm-2 status

Input exceeding high limit Input falling below low limit

Burnout

EEP sum error Parameter error

RJC error EEP error

Alarm-1 status Alarm-2 status

Alarm-3 status Alarm-4 status

User area

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Appendix Table of ASCII Codes

(Alphanumeric Codes)

In order to implement PC link communication, create a transmission/receiving program by referring to the Table of ASCII Codes below.

0 0 0 0

NUL DLE

SOH DC1

STX DC2

ETX DC3

EOT DC4

ENQ NAK

ACK SYN

BEL ETB

CAN

SUB

ESC

b5b6b7b8

0 0 1

0 1 0

“

‘

(

)

;

0 1 0 1

[

]

•

App.-1

{

}

DEL

Note: SP($20): space

DEL($7F): control code

Control code Character code

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Revision Information

● Title : M Series Digital Limit Alarms Communication Functions

● Manual No. : IM 77J04J11-01E

Aug. 2006/1st Edition

Newly published

Written by Yokogawa Electric Corporation

Published by Yokogawa Electric Corporation

2-9-32 Nakacho, Musashino-shi, Tokyo 180-8750, JAPAN

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Blank Page

Yokogawa M Series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction

Documentation Conventions

Notices

CONTENTS

1. Setup

1.1 Setup Procedure

1.2 Notes on Setting Parameters

2. Communication Specifications

2.1 RS-485 Communication Specifications

3. PC Link Communication

3.1 Overview

3.1.1 Configuration of Command

3.1.2 Configuration of Response

3.1.3 Response Error Codes

3.1.4 Specifying Broadcast

3.2 Commands

3.2.1 List of Commands

BRD Reads I relays on a bit-by-bit basis

BWR Writes data into I relays on a bit-by-bit basis

BRR Reads I relays on a bit-by-bit basis in random order

BRW Writes data into I relays on a bit-by-bit basis in random order

BRS Specifies I relays to be monitored on a bit-by-bit basis

BRM Monitors I relays on a bit-by-bit basis

WRD Reads D registers and I relays on a word-by-word basis

WWR Writes data into D registers and I relays on a word-by-word basis

WRM Monitors D registers and I relays on a word-by-word basis

INF Reads the model, range code number, number of alarms and revision

3.3 Communication with Higher-level Devices

3.3.1 Example of Communication Program Created Using Visual Basic

3.3.2 Communication with UT Link Module

3.3.3 Communication with Touch Panel

4. Ladder Communication

4.1 Overview

4.2 Commands/Responses at the PLC

4.2.1 Configuration of Command/Response

4.2.2 Reading Parameters

4.2.3 Writing Parameters

4.2.4 Response Error Codes

5. MODBUS Communication

5.1 Overview

5.1.1 Configuration of Message

5.1.2 Specifying D Registers

5.2 Function Codes

5.2.1 List of Function Codes

03 Reads data from multiple D registers

06 Writes data into a D register

08 Performs loop back test

16 Writes data into multiple D registers

5.2.2 Response Error Codes

5.2.3 Specifying Broadcast

6. Functions and Usage of D Registers

6.1 Overview of D Registers

6.2 Interpretation of D Register Map Table

6.3 D Register Map Table

6.3.1 Contents of D Registers

7. Functions and Usage of I Relays

7.1 Status

Revision Information