Yokogawa UT350L Operating Manual

User’ s Manual

Model UT350L Limit Controller

Communication Functions User’s Manual

IM 05D01D21-10E

2nd Edition

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Introduction

This user’s manual describes the communication functions of the UT350L controller and provides information on how to create communication programs.

The UT350L controller use the following communication protocols:

1) PC link communication protocol

2) Ladder communication protocol

The UT350L controller cannot communicate with a host device that uses a communication protocol other than the above.

Y ou are required to understand the communication specifications of host devices, as a background knowledge, in regard to their communication hardware, language used for creating communication programs, and so on.

* Host devices: PCs, PLCs (sequencers), graphic panels, and others

■ Intended Readers

This manual is intended for people familiar with the functions of the UT350L controller such as control engineers and personnel in charge of the maintenance of instrumentation and control equipment.

■ Related Documents

The following user’s manuals all relate to the communication functions of the UT350L controller. Read them as necessary. The codes enclosed in parentheses are the document numbers.

•

UT350L User’s Manual -Installation, Initial Setting, and so on.

(IM 05D01D21-01E to 03E)

Explains the basic operation of the UT350L controller .

■ Regarding This User’s Manual

(1) This manual should be provided to the end user. Keep an extra copy or copies of the

manual in a safe place.

(2) Read this manual carefully to gain a thorough understanding of how to operate this

product before starting operation.

(3) This manual describes the functions of this product. Yokogawa Electric Corporation

(hereinafter simply referred to as Yokogawa) does not guarantee the application of these functions for any particular purpose.

(4) Under absolutely no circumstances 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 that the details of this manual are accurate.

However, should any errors be found or important information be omitted, please

contact your nearest Yokogawa representative or our sales office.

IM 05D01D21-10E 2nd Edition: Jul. 30, 2004-00

■ Safety Precautions

The following symbol is indicated on the controller to ensure safe use.

This symbol on the controller 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

CAUTION

electric shock or other dangers that may result in injury or loss of life.

The following symbols are used in the hardcopy user’s manuals and in the user’s manual supplied on the CD-ROM.

NOTE

Indicates that operating the hardware or software in a particular manner may damage it or result in a system failure.

IMPORTANT

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

■ Force Majeure

(1) Y okogawa 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. (2) 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. (3) Be sure to use the spare parts approved by Yokogawa when replacing parts or

consumables. (4) Use this software with one specified computer only . You must purchase another copy

of the software for use on each additional computer. (5) Copying this software for purposes other than backup is strictly prohibited. (6) Store the floppy disk(s) (original medium or media) containing this software in a

secure place.

IM 05D01D21-10E 2nd Edition: Jul. 30, 2004-00

■ 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, make certain that all of the instructions and precautions relating to

safety contained in this document are strictly adhered to. Yokogawa does not guaran-

tee safety if products are not handled according to these instructions. (2) Modification of the product is strictly prohibited. (3) Reverse engineering such as the disassembly or decompilation of software is strictly

prohibited.

iii

IM 05D01D21-10E 2nd Edition: Jul. 30, 2004-00

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Model UT350L Limit Controller User’s Manual

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

1. Communications Overview.................................................................... 1-1

1.1 Interface Specifications.................................................................................. 1-1

2. Setup ....................................................................................................... 2-1

2.1 Setup Procedure ............................................................................................. 2-1

2.2 Wiring for Communication ............................................................................. 2-2

2.3 Notes on Setting Communication Parameters.............................................. 2-4

Toc-i

IM 05D01D21-10E 2nd Edition

2.2.1 Wiring to a Personal Computer ......................................................... 2-2

2.2.2 Wiring to a PLC (Sequencer) or Graphic Panel ................................. 2-3

2.3.1 Procedure to Set Communication Parameters .................................. 2-4

2.3.2 Description of Communication Parameters ....................................... 2-4

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

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

3.1.1 Configuration of Commands ............................................................. 3-2

3.1.2 Configuration of Response ............................................................... 3-4

3.2 Communication with Host Device.................................................................. 3-5

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

3.2.2 Specifying Broadcast ........................................................................ 3-7

3.2.3 Commands....................................................................................... 3-8

3.2.4 Response Error Codes ................................................................... 3-21

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

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

4.1.1 Configuration of Commands ............................................................. 4-2

4.1.2 Configuration of Response ............................................................... 4-3

4.2 Communication with PLC............................................................................... 4-4

4.2.1 Reading Data ................................................................................... 4-5

4.2.2 Writing Data...................................................................................... 4-6

4.2.3 Response Error Codes ..................................................................... 4-7

4.3 Communication with MELSEC ....................................................................... 4-8

4.3.1 Preparing for Communication ........................................................... 4-9

4.3.2 Wiring ............................................................................................... 4-9

4.3.3 Setting Communication Specifications ............................................ 4-10

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5. Functions and Use of D Registers ......................................................... 5-1

Toc-ii

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

5.2 Interpretation of D Register Tables ................................................................ 5-1

5.3 Classification of D Registers.......................................................................... 5-2

5.4 Process Data and User Area .......................................................................... 5-3

5.4.1 Process Data Area (Read-only) ........................................................ 5-4

5.4.2 User Area ......................................................................................... 5-5

5.5 Alarm Setpoint, Bias, and Filter Parameters ................................................. 5-6

5.5.1 Data Area for Alarm Setpoint, Bias, and Filter Parameters ................ 5-7

5.6 SP Parameter .................................................................................................. 5-8

5.6.1 Data Area for SP Parameter ............................................................. 5-9

5.7 Alarm Type, Limit Control Type Selection, and

Retransmission Parameters......................................................................... 5-10

5.7.1 Data Area for Alarm Type, Hysteresis, Limit Control Type Selection

Parameters..................................................................................... 5-12

5.7.2 Data Area for Retransmission and Key-lock Parameters................. 5-12

5.8 PV Input, Control Output, and Communication Parameters ...................... 5-13

5.8.1 Data Area for PV Input, and Communication Parameters................ 5-14

6. Functions and Use of I Relays ............................................................... 6-1

6.1 Overview.......................................................................................................... 6-1

6.2 Status I Relays ................................................................................................ 6-1

6.3 User Area ......................................................................................................... 6-2

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

IM 05D01D21-10E

2nd Edition: Jul. 30, 2004-00

1. Communications Overview

The UT350L controllers have an RS-485 serial communication interface, through which data exchange is performed with a device such as a personal computer , PLC (sequencer), and graphic panel.

The following five communication protocols are supported.

Table 1.1 Communication Protocols

Communication protocol Protocol specification

PC link communication

Ladder communication

Table 1.2 Connectable Devices

Communication protocol Connectable device Requirements

PC link communication

Ladder communication

Without sum check With sum check Handshaking

Personal computer Graphic panel PLC (sequencer) PLC (sequencer)

RS-232C/RS-485 converter

With serial communication module With ladder communication module

1-1

1.1 Interface Specifications

Table 1.3 RS-485 Interface

Interface Baud rate Other specifications Protocols available

Standard RS-485

Communication

system

4-wire, half-duplex

600, 1200 2400, 4800 9600bps

2-wire, half-duplex

- Asynchronous (start-stop)

- Handshaking

- Maximum communication distance: 1200 m

- Maximum number of connectable devices: 31

- Start bit: 1

- Data length: 8 or 7 bits

- Parity: No parity, even, odd

- Stop bit: 1 or 2

PC link communication

Ladder communication

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2. Setup

This chapter describes the procedure to set up the communication functions and also refers to some notes on wiring and communication parameters.

2.1 Setup Procedure

Set up the communication functions of the UT350L controller as follows:

Connect a host device and a UT350L controller. (See section 2.2.)

Set up the communication parameters of the UT350L controller. (See section 2.3.)

Create communication programs for the host device to perform communication.

Create communication programs referring to the documentation of each host device.

In this manual, “host devices” generically denotes PCs, PLCs (sequencers), and graphic panels.

2-1

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2.2 Wiring for Communication

Connect the UT350L controller and the host device for communication. The wiring procedures and precautionary notes are as follows.

NOTE

• T o avoid an electrical shock, be sure to turn off the power supply source to the equipment involved before you start wiring.

• Use crimp terminals at cable ends.

• Before you start wiring, read the user’s manual of each device.

2.2.1 Wiring to a Personal Computer

Since general personal computers cannot directly be connected to the RS-485 interface, wiring must be provided via an RS-232C/RS-485 converter. The following figures show the wiring for 4-wire connection and 2-wire connection.

2-2

● 4-wire connection

RS-232C straight cable

● 2-wire connection

RS-232C straight cable

Terminating resistor

220Ω1/4W

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

Terminating resistor

220Ω1/4W

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

Z-101HE UT350L UT350L

TD(+) TD(-) RD(+) RD(-) SHIELD

Communication cable

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

ML1- UT350L UT350L

B(+)

A(-)

4 6

Communication cable

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

23 24 25 26 27

Communication cable

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

23 24 25 26 27

Communication cable

JIS Class 3 grounding (grounding resistance

of 100Ω or less)

SDB(+) SDA(-) RDB(+) RDA(-)

23 24 25 26 27

Terminating resistor

220Ω1/4W

Terminating resistor

220Ω1/4W

Note: Z-101HE and ML1-■ are the converters of Sharp Corporation and Y okogawa Electric Corporation, respectively . You can also use other RS-232C/RS-485 converters. Before you use another converter, check its electrical specifications.

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2.2.2 Wiring to a PLC (Sequencer) or Graphic Panel

Since general PLCs (sequencers) and graphic panels have an RS-485 interface, they can be directly connected to a UT350L controller. If your PLC (sequencer) or graphic panel has an RS-232C interface, see subsection 2.2.1.

2-3

● 4-wire connection

● 2-wire connection

PLC or graphic panel UT350L UT350L

RDB(+)

Terminating

resistor

220Ω1/4W

JIS Class 3 grounding (grounding

resistance of 100Ω or less)

PLC or graphic panel UT350L UT350L

Terminating

resistor

220Ω1/4W

JIS Class 3 grounding (grounding

resistance of 100Ω or less)

RDA(-) SDB(+) SDA(-) SG

Communication cable

B(+) A(-)

Communication cable

23 24 25 26 27

Communication cable

JIS Class 3 grounding (grounding

resistance of 100Ω or less)

23 24 25 26 27

Communication cable

JIS Class 3 grounding (grounding

resistance of 100Ω or less)

SDB(+) SDA(-) RDB(+) RDA(-)

23 24

Terminating resistor

25 26 27

23 24 25 26 27

220Ω1/4W

Terminating resistor

220Ω1/4W

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2.3 Notes on Setting Communication Parameters

This section describes the parameters that set up the communication functions and their setting ranges.

NOTE

The communication specifications of both the UT350L controller and the host device must be the same. Check the communication specifications of the host device first, then set up the communication parameters of the UT350L controller .

2.3.1 Procedure to Set Communication Parameters

For the operation procedure, see the User’s Manual of UT350L controller . The UT350L are shipped from the factory with the following communication specifications.

Table 2.3.1 Protocol-by-Protocol Default Parameter Settings

2-4

Communication protocol PSL BPS

PC link communication (without sum check) PC link communication (with sum check) Ladder communication

Note: Circled numbers denote fixed values (i.e., the parameters can neither be shown nor changed).

0 1 2

9600 9600 9600

PRI

EVEN EVEN EVEN

2.3.2 Description of Communication Parameters

Table 2.3.2 Communication Parameters of UT350L controller

Parameter name

Protocol selection

Address Baud rate Parity Stop bit Data length Minimum response time

*1: Data length is fixed at 8 bits for ladder communication is selected.

Parameter code

PSL

ADR

BPS

PRI

STP

DLN

RP.T

PC link communication

Ladder communication

600, 1200, 2400, 4800, 9600 (bps)

NONE (no parity), EVEN, ODD

Setting range

0: Without sum check 1: With sum check

2: Ladder communication

1 to 99

1, 2 (bit)

7, 8 (bit)

0 to 10 (×10 ms)

STP

1 1 1

DLN

8 8 8

Default

9600

EVEN

1 8 0

1) Protocol selection (PSL)

Set the same communication protocol as that of the host device to be connected to. The UT350L controller supports PC link and ladder communication protocols, which are specific to UT350L controller .

2) Baud rate (BPS)

Set the same baud rate as that of the host device to be connected. (Otherwise, proper communication cannot be achieved.) The unit of baud rate is bps (bits per second).

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3) Address number (ADR)

Set the address number of the UT350L controller to one that is not being used by another controller. An address number of 1 to 99 can be assigned in any order. Note that the number of UT350L controllers that can be connected to a single communication port is limited to 31.

Example of connecting four UT350L controllers to a host device with address numbers of 1, 50, 10, and 20:

Max. 1200 m; the maximum number of slave units: 31

2-5

ADR=1 ADR=50 ADR=10 ADR=20

4) Parity (P ARI)

Set the handling of parity to be carried out when data is sent or received. Set the same parity state as that of the host device to be connected.

5) Stop bit (STP)

Set the same stop bit as that of the host device to be connected.

6) Data length (DLN)

Set the same data length as that of the host device to be connected. (When ladder communication is selected, the data length is fixed.)

7) Minimum response time (RP.T)

Set the time taken to respond to the host device after the UT350L controller receives transmission data from it. The unit is 10 ms. The response time will be “communication processing time + the set value of RP.T X 10” milliseconds.

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3. PC Link Communication

3.1 Overview

PC link communication protocol is one of the protocols used to communicate with devices such as PCs, PLCs (sequencers), and graphic panels. Via this communication protocol, these devices can exchange data with a UT350L controller by reading/writing the controller’s internal registers (D registers and I relays).

Hereafter, PCs, PLCs (sequencers), and graphic panels shall be referred to as “host devices.”

In PC link communication, a host device identifies UT350L controller with a communication address, which ranges from 1 to 99. However, broadcasting, which requires no address number, is possible with some of the commands. For more information, see subsection

3.2.2.

3-1

Max. 1200 m; the maximum number of slave units: 31

UT350L controllers

Figure 3.1 Connection of PC Link Communication

The next section will discuss the configuration of commands and responses.

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3.1.1 Configuration of Commands

Commands sent from a host device to a UT350L controller consist of the following elements.

3-2

Number of bytes

Element

STX

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

Address number

(ADR)

CPU number

Time to wait

for response

Command

Variable length

Data corresponding

to command

Checksum

ETX1CR

(1) STX (Start of Text)

This control code indicates the start of a command. The character code is CHR$(2).

(2) Address Number (01 to 99)

Address numbers are used by a host device to identify which UT350L controller to communicate with. (ID number of the UT350L)

Adress Number = UT350L parameter (ADR) value

(3) CPU Number

This number is fixed to 01.

(4) Time to W ait for Response

This is fixed to 0.

(5) Command (See subsection 3.2.1.)

Specify a command to be issued from the host device.

(6) Data Corresponding to Command

Specify an internal register (D register or I relay), number of data items, UT350L parameter values, or others.

(7) Checksum

In PC link communication with sum check, the ASCII codes of the text between STX and the checksum are converted into hexadecimal values and added on a byte basis. Then the lowermost byte of the added results is turned into ASCII code, and its lower byte is used as the checksum.

This 2-byte space is unnecessary for PC link communication without sum check.

(8) ETX (End of Text)

This control code indicates the end of a command string. The character code is CHR$(3).

(9) CR (Carriage Return)

This control code marks the end of a command. The character code is CHR$(13).

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NOTE

The control codes STX, ETX, and CR in commands are indispensable. Do not miss any of them when you create a communication program for PC link communication. A communication failure will result if any of them are omitted or if the order is incorrect.

● Data Forms of Commands

The table below shows the data forms of D registers and I relays.

Table 3.1 Data Forms

Data type Data content Data form

PV high and low limits, target setpoints, and others

Bias, deviation alarms, and others Limit control types, alarm types, and others

* Parameter list of UT350L controller User’s Manual for information about data form.

Measuring range (EU) data

Measuring range span (EUS) data Seconds, absolute values, and data

without unit*

Numeric data excluding the decimal point

Numeric data excluding the decimal point Absolute value excluding the decimal point

3-3

● Command Format for Communication

Example: When setting a target setpoint “50.0” to a UT350L controller , the host device sends the value “500” as command data without the decimal point (this is true for both settings 5.00 or 500).

Data to be sent from the host device: 500

Command data: 500

UT350L side

Target setpoint: 50.0

* The position of the decimal point for “500” is determined by the DP (decimal point position) parameter of the UT350L controller.

Response data from UT350L: 500

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3.1.2 Configuration of Response

Responses from a UT350L controller with respect to a command sent from the host device consist of the elements shown below, which dif fer depending on the condition of communication - normal or failure.

1) With Normal Communication

When communication is carried out normally , the UT350L controller returns the character string “OK” and, in response to read commands, also returns read-out data.

3-4

Number of bytes

Element1STX

Address number (ADR)2CPU number:012OK

Variable length

Parameter data

Checksum

2) In the Event of Failure

If communication is carried out abnormally , the UT350L controller returns the character string “ER” and error codes (EC1 and EC2). (See subsection 3.2.4, Response Error Codes.)

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

• If a UT350L controller cannot receive an ETX contained in a command, a response may not be made.

* As a measure against these situations, provide a timeout processing in the communica-

tion functions or communication programs of the host device.

Number of bytes

Element

STX

Address number

(ADR)

CPU number:

2ER2

EC12EC23Command2Checksum

ETX1CR

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3.2 Communication with Host Device

In PC link communication, when specifying D registers or I relays (internal registers of UT350L controller), you can use the numbers as is. The numbers of these internal registers are in the following format:

• D registers: D**** (****: numeric value)

• I relays : I**** (****: numeric value)

Host devices to be connected to a UT350L controller are those capable of handling the PC link communication protocol.

(1) Connectable graphic panels

Graphic panels that can be connected to a UT350L controller are listed below . However, it may be possible to connect graphic panels other than the ones listed below .

Table 3.2 List of Graphic Panels Connectable

Product Name Name Remarks

Pro-face by Digital Electronics Corporation

Note: For more information about Digital’s graphic panels, contact Digital Electronics Corporation. (Be careful because the display device differs depending on the model.)

GP70 series GP-J series GP-230 series GP-430 series GP-530 series

Graphic control panel High-speed graphic control panel Medium-size graphic control panel Advanced, high-speed graphic control panels

3-5

(Note)

(2) Communication with F A-M3 with UT-link module

No ladder communication program is required to communicate with FA-M3 with UT-link module (Y okogawa PLC). The UT -link module’s function offers 2 modes, in which users can exchange data without paying attention to the communication procedure. (For more information, see the user’s manual of UT-link module “IM 34M6H25-01E.”)

● User-specifiable mode: Always reads/writes the user-specified devices* of the UT350L controller .

● Command mode: Accesses the devices* of the UT350L controller only when necessary.

*:“Device” here denotes the internal registers of the UT350L controller (D registers and I relays).

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+ 49 hidden pages

Yokogawa UT350L Operating Manual

Introduction

CONTENTS

1. Communications Overview

1.1 Interface Specifications

2. Setup

2.1 Setup Procedure

2.2 Wiring for Communication

2.2.1 Wiring to a Personal Computer

2.2.2 Wiring to a PLC (Sequencer) or Graphic Panel

2.3 Notes on Setting Communication Parameters

2.3.1 Procedure to Set Communication Parameters

2.3.2 Description of Communication Parameters

3. PC Link Communication

3.1 Overview

3.1.1 Configuration of Commands

3.1.2 Configuration of Response

3.2 Communication with Host Device