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Yokogawa UT150L Operating Manual

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User’s Manual
Model UT150L Communication Functions
IM 05C01E22-10E
IM 05C01E22-10E
3rd Edition

Introduction

This instruction manual describes the communication functions of the UT150L controller and contains information on how to create communication programs.
Read the manual carefully to understand the communication functions of the UT150L.
The UT150L controller has the following communication protocols.
1) PC link communication protocol
2) MODBUS communication protocol
Note that the UT150L controller cannot communicate with a host device with a communication protocol other than these.
■ Intended Readers
This manual is intended for people familiar with the functions of the UT150L Controller and control engineers and personnel in charge of maintaining instrumentation and control equipment.
You are required to understand as a background knowledge the communication specifications of higher-level devices, in regard to their communication hardware, language used for creating communi­cation programs, and so on.
■ Related Documents
The following instruction manuals all relate to the communication functions. Read them as necessary. The codes enclosed in parentheses are the document numbers.
• Model UT150L Limit Controller (IM 05C01E22-01E) Explains the basic operation of the UT150L controller. Supplied with the UT150L Limit Controller.
FD No. IM 05C01E22-10E 3rd Edition: Jun. 2004 (YK) AllRights Reserved. Copyright © 2000. Yokogawa Electric Corporation
i

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.
NOTE
Gives additional information to complement the present topic and/or describe terms specific to this document.
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 exaggerated,
simplified, or partially omitted for reasons of convenience when explaining them.
(2) Figures and illustrations representing the controller’s displays may differ from the real displays in
regard to the position and/or indicated characters (upper-case or lower-case, for example), to the extent that they do not impair a correct understanding of the functions and the proper operation and monitoring of the system.
ii

Notices

■ Regarding This Instruction Manual
(1) This manual should be passed on to the end user. Keep at least one extra copy of 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 tran-
scribed 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.
■ 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 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 instruction 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 electrical 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.
iii
■ Force Majeure
(1) Yokogawa does not make any warranties regarding the product except those mentioned 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) Use this software with one specified computer only. You must purchase another copy of the
software for use on each additional computer. (6) Copying this software for purposes other than backup is strictly prohibited. (7) Store the floppy disk(s) (original medium or media) containing this software in a secure place. (8) Reverse engineering such as the disassembly or decompilation of software is strictly prohibited. (9) 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.
iv

Contents

Introduction........................................................................................................................... i
Documentation Conventions............................................................................................... ii
Notices ................................................................................................................................. iii
Chapter 1. Setup ............................................................................................................. 1-1
1.1 Setup Procedure .............................................................................................. 1-1
1.2 Notes on Setting Parameters ........................................................................... 1-2
Chapter 2. Communication Specifications................................................................... 2-1
2.1 RS-485 Communication Specifications .......................................................... 2-1
Chapter 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
3.2 Communication with Host Device.................................................................. 3-4
3.2.1 List of Commands ................................................................................... 3-5
3.2.2 Specifying Broadcast ............................................................................... 3-6
3.2.3 Commands ............................................................................................... 3-7
3.2.4 Response Error Codes ........................................................................... 3-20
3.3 Example of BASIC Program for Send and Receive .................................... 3-21
Chapter 4. MODBUS Communication......................................................................... 4-1
4.1 Overview ......................................................................................................... 4-1
4.1.1 Configuration of Message ....................................................................... 4-2
4.2 Communication with Host Device.................................................................. 4-3
4.2.1 List of Function Codes ............................................................................ 4-3
4.2.2 Specifying Broadcast ............................................................................... 4-4
4.2.3 Function Codes ........................................................................................ 4-5
4.2.4 Response Error Codes ............................................................................. 4-9
Chapter 5. Functions and Usage of D Registers .......................................................... 5-1
5.1 Overview of D Registers ................................................................................. 5-1
5.2 Interpretation of Lists of D Registers
(D Register Map Tables) ................................................................................. 5-1
5.3 Classification of D Registers .......................................................................... 5-2
5.4 Register Map Table ......................................................................................... 5-3
5.4.1 D Register Contents ................................................................................. 5-4
Chapter 6. Functions and Usage of I Relays ............................................................... 6-1
6.1 Status I Relays................................................................................................. 6-1
v
Appendix Table of ASCII Codes (Alphanumeric Codes)...................................App. 1
Revision Record .................................................................................................................... i
vi

1. Setup

This chapter describes the setup procedure required to be able to use the communication functions (PC link, and MODBUS) and the communication parameters of the UT150L.

1.1 Setup Procedure

Set up the communication functions on the UT150L as follows:
Set up the communication function parameters of the UT150L. (See Section 1.2.)
Connect a higher-level device and a UT150L. (See the connection diagram below.)
Create communication programs for the higher-level device to perform communication.
Chapter 1 Setup
Communication programs should be created referring to the documentation of each higher-level device.
*
● For UT150L connection
PC, PLC, or graphic panel
B(+)
Terminating resistor 220Ω 1/4 W
Grounding resistance of no greater than 100Ω
A(-)
SG
Shield
UT150L UT150L
RSB(+)
RSA(-)
SG
3
4
5
Grounding resistance of no greater than 100Ω
RSB(+)
RSA(-)
SG
3
4
5
Terminating resistor 220Ω 1/4 W
IM 05C01E22-10E 1-1
1.2 Notes on Setting Parameters
This section describes the setting parameters for using the communication functions and their setting ranges.
NOTE
The details of UT150L communication functions need to be the same as those of the communication functions of the host devices to be connected. Check the communication parameters of the host device first, then set up those of the UT150L.
Table 1-1 Parameters to be Set for Communication Functions
Parameter Name
Symbol
Setting Range
Default
PSL
Address Baud rate Parity
Stop bit Data length
Note 1: When “3: ASCII mode” is selected for M When “4: RTU mode” is selected, it is fixed to “8.”
ADR BPS PRI
STP 1, 2 DLN
PC link communicationProtocol selection
MODBUS communication
1 to 99 0: 2400, 1: 4800, 2: 9600 0: none, 1: even, 2: odd
7, 8 (Note 1)
ODBUS
communication in protocol selection, the data length is fixed to “7.”
0: without sum check 1: with sum check
3: ASCII mode 4: RTU mode
● Protocol-by-Protocol Default Parameter Settings
PSL BPS PRI STP DLN
Communication Protocol
PC-link communication without sum check 0 9600 EVN 1 8 PC-link communication with sum check 1 9600 EVN 1 8 MODBUS communication (ASCII mode) 3 9600 EVN 1 7 MODBUS communication (RTU mode) 4 9600 EVN 1 8
Note: Circled numbers denote fixed values.
Parameter
0
1 2: 9600 1: EVN
1 8
1-2
● Protocol selection (PSL)
Set the same communication protocol as that of the host device to be connected. The UT150L has PC link communication, and MODBUS communication functions.
Chapter 1 Setup
● Address number (ADR)
Set the address number of the UT150L itself. An address number of 1 to 99 may be assigned in any order. There is however one limitation — the number of UT150L to be connected to a single commu­nication port is limited to 31.
Example of connecting four UT150L to a host device by setting address numbers of 1, 50, 10, and 20
Personal computer
Maximum overall cable length of 1200 m for a maximum of 31 substations
ADR=1 ADR=10
ADR=20ADR=50
● Baud rate (BPS)
Set the same communication rate as that of the host device to be connected. (Otherwise, proper communication cannot be achieved.) The unit of the communication rate is bps (bits per second).
● Parity (PRI)
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.
● Stop bit (STP)
Set the same stop bit as that of the host device to be connected.
● Data length (DLN)
Set the same data length as that of the host device to be connected. (When MODBUS communication (PSL: 3 or 4) is chosen in protocol selection, the data length is fixed.)
IM 05C01E22-10E 1-3
1-4
Chapter 2 Communication Specifications

2. Communication Specifications

The RS-485 communication interface has the PC link communication, and the MODBUS communica­tion.
Table 2-1 UT150L Communication Protocol
Communication Hardware Terminal Communication Protocol
Specifications
Maximum Baud Rate
2-wire RS-485 communication system Terminal numbers: 3-5 PC link communication without sum check
PC link communication with sum check MODBUS communication (ASCII mode) MODBUS communication (RTU mode)
9600 bps
Table 2-2 Types of Devices to be Connected
Device to be Connected
PC
Communication Protocol
PC link communication MODBUS communication
Example of Connected Devices
General-purpose PCs General-purpose PCs

2.1 RS-485 Communication Specifications

Table 2-3 RS-485 Communication Interface
Item
Standard Maximum number of devices to be connected Communication system Synchronization Communication protocol Maximum communication distance Baud rate
EIA RS-485 compliant 31 2-wire, half duplex Asynchronous (start-stop) No-protocol 1200 m 2400, 4800, 9600
Specifications
IM 05C01E22-10E 2-1
2-2

3. PC Link Communication

3.1 Overview

Chapter 3 PC Link Communication
Personal computer
The use of PC link communication enables UT150L to communicate with a device such as a PC, easily. In this communication, you can use such device to read/write data from/into D registers or read data from I relays, both of which are internal registers of the UT150L.
Hereafter, PCs, are generally called “host devices.”
See Also
Chapters 5 and 6 for information on the D registers and I relays.
In the PC link communication, a host device identifies each UT150L with a communication address of 1 to 99. Some of commands to use let you to specify broadcast that requires no address numbers. For more information on broadcast specification, see subsection 3.2.2.
Maximum overall cable length of 1200 m for a maximum of 31 substations
Figure 3-1 Connection of Slaves in PC Link Communication
IM 05C01E22-10E 3-1

3.1.1 Configuration of Command

Commands sent from a host device to UT150L, consist of the following elements.
Number of
Bytes
Element
1
STX2Address
number
(ADR)
(1) (2) (3) (4) (5) (6) (7) (8) (9)
2
CPU
number
01
1
Time to wait for
response
0
3
Command
Variable length
Data corresponding
to command
2
Checksum1ETX1CR
(1)STX (Start of Text)
This control code indicates the start of a command. The character code is CHR$(2).
(2)Address Number (01 to 99)
Address numbers are used by the host device to identify UT150L at the communication destination. (They are identification numbers specific to the UT150L.)
(3)CPU Number
This number is fixed to 01.
(4)Time to Wait for Response
This is fixed to 0.
(5)Command (See subsection 3.2.1, List of Commands)
Specify a command to be issued from the host device.
(6)Data Corresponding to Command
Specify an internal register (D register or I relay), number of data pieces, UT150L parameter value, and others.
(7)Checksum
This converts the ASCII codes of texts between the character next to STX and the character immedi­ately before the checksum into hexadecimal values and adds them byte by byte. It then fetches the single lowermost byte of the added results as the checksum.
This column is only required for PC link communication with checksum. PC link communication without checksum does not require this 2-byte space of ASCII code.
(8)ETX (End of Text)
This control code indicates the end of a command string. The character code is CHR$(3).
(9)CR (Carriage Return)
This control code indicates the end of a command. The character code is CHR$(13).
NOTE
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.
3-2
Chapter 3 PC Link Communication
● Data Form of Commands
The table below shows the data forms of commands for D registers and I relays.
Table 3-1 Data Forms of Commands for D Registers and I Relays
Type of Data
PV high and low limits, target setpoints, and oth­ers
Bias, deviation alarms, and other
Proportional bands, upper and lower limits of output, and others
Various modes, alarm types, and others
Contents of Data
Measuring range (EU) data
Measuring range width (EUS) data
% data (0.0 to 100.0%)
Seconds, absolute values, and data without unit
Specified Form
Numeric data not including the deci­mal point
Numeric data not including the deci­mal point
0 to 1000
Absolute values not including the decimal point
● Command Format for Communication
Example: When setting a target setpoint “50.0” to a UT150L, the host device sends the value “500” as command data without the decimal point (this is true for both setting 5.00 or 500).
Data to be send from the host device: hexadecimal value of 500 (01F4)
Command data: 01F4 Response data from UT150L: 01F4
UT150L side
The position of the decimal point for “500” is determined by the DP (position of decimal point) parameter of the UT150L.
*
Target setpoint: 50.0

3.1.2 Configuration of Response

Responses from UT150L with respect to a command sent from the host device consists of the ele­ments shown below, which differ depending on the condition of communication; normal or failure.
1) Normal Communication
When communication is complete normally, UT150L return a character string “OK” and when the read commands, return read-out data.
Number of
Bytes
Element
2) In the Event of Failure
If communication is complete abnormally, UT150L return a character string “ER” and error code (EC1 and EC2). (See subsection 3.2.4, Response Error Codes.)
1
STX2Address
number
(ADR)
number
2
CPU
01
Variable length
2
Parameter data2Checksum1ETX1CR
OK
•
No response is made in case of an error in address number specification or CPU number specification.
• If a UT150L cannot receive ETX in a command, response may not be made. * As a measure against those, provide a timeout process in the communication functions of the host
device or in communication programs.
Number of
Bytes
Element
IM 05C01E22-10E 3-3
1
STX2Address
number
(ADR)
2
CPU
number
01
2
ER
2
EC12EC2
3
Command2Checksum1ETX
1
CR

3.2 Communication with Host Device

In PC link communication, when specifying D registers or I relays, the internal registers of UT150L, you can use their numbers as is. The specifications of the number of each internal register are:
• D registers: D**** (****: numeric value)
• I relays: I**** (****: numeric value)
Host devices to be connected to UT150L are those capable of handling the PC link communication protocol.
As an example of communication program, Section 3.3 shows an example of BASIC program created using Microsoft Quick BASIC.
3-4

3.2.1 List of Commands

The following shows the lists of commands available in PC link communication. The details of them are explained in the description of each command.
(1)Bit-basis Access Commands Dedicated to I Relays
Chapter 3 PC Link Communication
Command
BRD
BWR
BRR
BRW
BRS
BRM
Bit-basis read Bit-basis write Bit-basis, random read Bit-basis, random write Specifies I relays to be monitored on a bit-by-bit basis. Bit-basis monitoring
(2)Word-basis Access Commands
Command
WRD
WWR
WRR
WRW
WRS
WRM
Word-basis read Word-basis write Word-basis, random read Word-basis, random write Specified internal registers to be monitored on a word basis Word-basis monitoring
(3)Information Command
Command
INF
Reads model, presence/absence of option, and revision. 1
Description
Description
Description
Number of Bits to be Handled
1 to 48 bits 1 to 32 bits 1 to 16 bits 1 to 16 bits 1 to 16 bits
—
Number of Bits to be Handled
1 to 32 words 1 to 32 words 1 to 16 words 1 to 16 words 1 to 16 words
—
Number of Devices to be Handled
IM 05C01E22-10E 3-5

3.2.2 Specifying Broadcast

Note: The substations do not give any response.
Host controller (master station)
Maximum overall cable length of 1200 m for a maximum of 31 substations
Figure 3-2 Specifying Broadcast
The broadcast function enables all of the connected UT150L or other devices to receive a command. Specifying an address number in Table 3-3 for the address number column in a command enables the host device to write data from/into the internal registers of all UT150L or other devices.
For UT150L, internal registers (D registers and I relays) are assigned with numbers for management. (See chapters 5 and 6 for details.) For the internal registers of other models, see the documentation of the relevant model.
Table 3-2 Address Numbers
ADR
BG
UT150L and UT100 Series
The personal computer sends data to all of the substations at one time.
Applicable Devices
3-6

3.2.3 Commands

BRD Reads I relays on a bit-by-bit basis.
● Function
Reads a sequence of contiguous ON/OFF statuses 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 48.
• 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 command element in the command.
● Command/Response (for normal operation)
Chapter 3 PC Link Communication
Number of
Bytes
Command
element
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
1
STX2Address
number
(ADR)
2
CPU
number
01
2
CPU
number
01
3
1
BRD
0
2OK1d11d21
5
I relay
number
d3
1
Comma or space
… …
3
Number
of bits
(n)
1
dn2Checksum1ETX1CR
2
Checksum
ETX1CR
The response is “0” when the status is OFF or “1” when ON.
dn: read data to the extent of the specified number of bits (n = 1 to 48) dn = 0 (OFF) dn = 1 (ON)
● Example: Reading the status of alarm 1 of the UT150L with address number 01
The following command reads the status of alarm 1 (I0001) at address number 01.
[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$
Alarm has been ON since 1 was returned.
1
IM 05C01E22-10E 3-7
BWR Writes data into I relays on a bit-by-bit basis.
● Function
Writes ON/OFF data into a sequence of contiguous I relays at intervals of the specified number of bits and starting at a specified I relay number.
• The number of bits to be written 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 a checksum function. When performing communication
without checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
… …
1
STX2Address
number
(ADR)
1
dn
2
Checksum1ETX1CR
2
CPU
number
01
3
1
BWR
0
5
I relay
number
Comma or space
Write information is “0” when it is OFF or “1” when it is ON.
dn: write data to the extent of the specified number of bits (n = 1 to 32) dn = 0 (OFF) dn = 1 (ON)
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
2
CPU
number
01
2
OK
2
Checksum1ETX1CR
1
3
Number
of bits
(n)
1
Comma or space
1d11
d2
3-8
● Example: Setting the user-defined flag of UT150L with address number 01 to ON. The following command writes ON into the user-defined flag (I0018) at address number 01.
[Command] STX$+ “01010BWRI0018, 001, 1AC” +ETX$+CR$
Note: The user-defined flag is a flag the user can read/write without restraint. For areas available to
the user, see Chapter 6, Functions and Applications of I Relays.
“OK” is returned as the response to the above command.
[Response] STX$+ “0101OK5C” +ETX$+CR$
Chapter 3 PC Link Communication
BRR Reads I relays on a bit-by-bit basis in a random order.
● Function
Reads the ON/OFF statuses of I relays at intervals of the specified number of bits in a random order.
• The number of bits to be read at a time is 1 to 16.
• For the format of response in the event of failure, see subsection 3.1.2.
• The command shown below includes a checksum function. When performing communication
without a checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
… …
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
5
I relay
number
n
1
STX2Address
number
(ADR)
2
Checksum
2
CPU
number
01
1
ETX1CR
2
CPU
number
01
3
1
BRR
0
2OK1d11
Number
of bits
(n)
d2
2
number
… …
The response is “0” when the status is OFF or “1” when ON.
dn: read data to the extent of the specified number of bits (n = 1 to 16) dn = 0 (OFF) dn = 1 (ON)
5
I relay
1
1
dn
1
Comma
or space
2
Checksum
5
I relay
number
2
1
ETX1CR
1
Comma or space
● Example: Reading the statuses of alarms 1 and 2 of the UT150L with address number 05 The following command reads the statuses of alarm 1 (I0001) and alarm 2 (I0002) at address number 05.
[Command] STX$+ “05010BRR04I0001, I00027F” +ETX$+CR$
With respect to the above command, the ON and OFF responses are returned for alarms 1 and 2 respectively.
[Response] STX$+ “0501OK10C1” +ETX$+CR$
Alarm 1 has been ON.
IM 05C01E22-10E 3-9
BRW Writes data into I relays on a bit-by-bit basis in a random order.
● Function
Writes ON/OFF statuses into I relays at intervals of the specified number of bits on a per-I relay basis and in random order.
• The number of bits to be written at a time is 1 to 16.
• 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 a checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
1
Comma or space
1
STX
1
d2
2
Address
number
(ADR)
15
Comma or space
CPU
number
01
… …
2
1 0
I relay
number
n
3
BRW
1
Comma or space
2
Number
of bits
(n)
1
dn
I relay
number
Checksum
Write information is “0” when it is OFF or “1” when it is ON.
dn: write data to the extent of the specified number of bits (n = 1 to 16) dn = 0 (OFF) dn = 1 (ON)
Number of
Bytes
Response
element
1
STX
2
Address
number
(ADR)
2
CPU
number
01
2
OK
2
Checksum
1
ETX1CR
5
1
2
1
Comma or space
1
ETX1CR
1
d1
1
Comma
or space
5
I relay
number
2
3-10
● Example: Setting four user-defined flags of the UT150L with address number 05 to ON, OFF,
OFF, and ON. The following command sets the four user-defined flags (I0025, I0026, I0027, and I0028) at address number 05 to ON, OFF, OFF, and ON respectively.
[Command] STX$+ “05010BRW04I0025, 1, I0026, 0, I0027, 0, I0028, 181” +ETX$+CR$
Note: The user-defined flags (I relays) are flags that the user can freely read/write. For areas available to the user, see Chapter 6, Functions and Applications of I Relays.
“OK” is returned as the response to the above command.
[Response] STX$+ “0501OK60” +ETX$+CR$
Chapter 3 PC Link Communication
BRS Specifies I relays to be monitored on a bit-by-bit basis.
● Function
Specifies the numbers of I relays 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.
When the volume of data is large and you wish to increase the communication rate, it is effective to use a combination of the BRS and BRM commands rather than the BRD command.
• The number of registers to be specified at a time is 1 to 16.
• 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 a checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
… …
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
5
I relay
number
n
1
STX2Address
number
(ADR)
2
Checksum
2
CPU
number
01
1
ETX1CR
2
CPU
number
01
1 0
2
OK
3
BRS
2
Checksum
2
Number
of bits
(n)
1
ETX1CR
5
I relay
number
1
1
Comma or space
3
I relay
number
2
Comma
or space
● Example: Monitoring the PV burnout status of the UT150L with address number 05 The following command monitors the PV burnout status (I0007) at address number 05.
(This command is used for simply specifying registers.)
[Command] STX$+ “05010BRS01I00074D” +ETX$+CR$
1
“OK” is returned as the response to the above command.
[Response] STX$+ “0501OK60” +ETX$+CR$
IM 05C01E22-10E 3-11
BRM Monitors I relays on a bit-by-bit basis.
● Function
Reads the ON/OFF statuses of 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 generated. This error also occurs if the power supply is turned off.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
1
STX2Address
number
(ADR)
2
CPU
number
01
2
CPU
number
01
3
1
BRM
0
2OK1d11d21
2
Checksum
d3
1
ETX1CR
… …
1
dn
2
Checksum
1
ETX1CR
The response is “0” when the status is OFF or “1” when ON.
dn: read data to the extent of the number of bits specified by the BRS command (n = 1 to 16) dn = 0 (OFF) dn = 1 (ON)
● Example: Monitoring the PV burnout status of the UT150L with address number 05 The following command monitors the PV burnout status (I0007) at address number 05. (This command reads the statuses of the I relays specified by the BRS command.)
[Command] STX$+ “05010BRMD7” +ETX$+CR$
The ON/OFF status of the I relay is returned as the response to the above command.
3-12
[Response] STX$+ “0501OK191” +ETX$+CR$
I relay has been ON.
Chapter 3 PC Link Communication
WRD Reads D registers and I relays on a word-by-word basis.
● Function
Reads a sequence of contiguous register information on a word-by-word basis, by the specified number of words, and starting at the specified register number.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
1
STX
2
Address
number
(ADR)
2
CPU
number
01
2
CPU
number
01
1 0
2
OK
WRD
3
4
dddd14dddd2
5
Register
number
1
Comma
or space
… …
2
Number
of words
(n)
4
ddddn
2
Checksum
2
Checksum1ETX1CR
1
ETX1CR
The response is returned in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern.
Read data of the specified number of words ddddn = character string in a hexadecimal pattern n = 1 to 32
● Example: Reading a measured input value of the UT150L with address number 03 The following command reads the measured input value (D0002) at address number 03.
[Command] STX$+ “03010WRDD0002, 0174” +ETX$+CR$
The measured input value 200 (00C8 (HEX)) is returned as the response to the above command.
[Response] STX$+ “0301OK00C839” +ETX$+CR$
IM 05C01E22-10E 3-13
WWR Writes data into D registers and I relays on a word-by-word basis.
● Function
Writes information into a sequence of contiguous registers on a word-by-word basis, by the specified number of words, and starting at the specified register number.
• The number of words to be written 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
4
dddd2
1
STX2Address
… …
number
(ADR)
4
ddddn
CPU
number
01
Checksum1ETX1CR
1
2
2
3
0
WWR
5
Register
number
1
Comma
or space
2
Number
of words
(n)
1
Comma or space
4
dddd1
Write information is specified in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern.
Write data of the specified number of words ddddn = character string in a hexadecimal pattern n = 1 to 32
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
2
CPU
number
01
2
OK
2
Checksum1ETX1CR
3-14
● Example: Writing “200” into target setpoint of UT150L with address number 03. The following command writes data 200 (00C8 (HEX)) into the target setpoint 1 (D0120) at address number 03.
[Command] STX$+ “03010WWRD0120, 01, 00C88F” +ETX$+CR$
“OK” is returned as the response to the above command.
[Response] STX$+ “0301OK5E” +ETX$+CR$
Chapter 3 PC Link Communication
WRR Reads D registers and I relays on a word-by-word basis in random order.
● Function
Reads the statuses of registers on a word-by-word basis, by the specified number of words and in a random order.
• The number of words to be read at a time is 1 to 16.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
… …
Number of
Bytes
Response
element
1
STX2Address
5
Register
number
(n)
1
STX2Address
number
(ADR)
2
Checksum
number
(ADR)
2
CPU
number
01
1
ETX1CR
2
CPU
number
01
1 0
2
OK
3
WRR
Number
of words
(n)
4
dddd14dddd2
2
5
Register number
1
… …
Comma or space
4
ddddn
1
Checksum
5
Register
number
2
2
1
Comma or space
1
ETX1CR
The response is returned in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern.
ddddn = character string in a hexadecimal pattern (n = 1 to 16)
● Example: Reading the measured input and output values of the UT150L with address number 10. The following command reads the measured input value (D0002) and the target setpoint (D0003) at address number 10.
[Command] STX$+ “10010WRR02D0002, D000388” +ETX$+CR$
The measured input value 200 (00C8 (HEX)) and output value 50 (0032 (HEX)) are returned as the response to the above command.
[Response] STX$+ “1001OK00C80032FC” +ETX$+CR$
IM 05C01E22-10E 3-15
WRW
Writes data into D registers and I relays on a word-by-word basis in random order.
● Function
Writes register information specified for each register into registers of the specified number of words in a random order.
• The number of words to be written at a time is 1 to 16.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
5
Register
number
2
1
STX2Address
1
Comma
or space
number
(ADR)
4
dddd2
2
CPU
number
01
… …
1 0
5
Register
number
n
3
WRW
Comma or space
Number
of words
1
2
(n)
ddddn
5
Register
number
1
4
2
Checksum1ETX1CR
1
Comma or space
4
dddd1
1
Comma
or space
Write information is specified in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern.
Repetition of register numbers and write information by the specified number of words ddddn = character string in a hexadecimal pattern n = 1 to 16
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
2
CPU
number
01
2
OK
2
Checksum1ETX1CR
3-16
● Example: Writing “20.0” into target setpoint 1 of UT150L with address number 10 and “15.0” into
the alarm-1 setpoint.
The following command writes “20.0” into target setpoint 1 (D0120) and “15.0” into the alarm-1 setpoint (D0101) at address number 10.
[Command] STX$+ “10010WRW02D0120, 00C8, D0101, 009694” +ETX$+CR$
Alarm setpoint: 150Target setpoint: 200
“OK” is returned as the response to the above command.
[Response] STX$+ “1001OK5C” +ETX$+CR$
Chapter 3 PC Link Communication
WRS Specifies the D registers and I relays to be monitored on a word-by-word basis.
● Function
Specifies the numbers of the registers 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.
If the volume of data is large and you wish to increase the communication rate, it is useful to use a combination of the WRS and WRM commands rather than the WRD command. If the power supply is turned off, the register numbers specified will be erased.
• The number of words to be specified at a time is 1 to 16.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Command (continued)
… …
Number of
Bytes
Response
element
1
STX2Address
5
Register
number
n
1
STX2Address
number
(ADR)
2
Checksum
number
(ADR)
CPU
number
01
ETX1CR
CPU
number
01
1
2
1
2
0
2
OK
3
WRS
Checksum
2
2
Number
of words
(n)
1
ETX1CR
5
Register
number
1
1
Comma or space
5
Register
number
2
1
Comma
or space
● Example: Monitoring the measured input value of UT150L with address number 01 The following command monitors the measured input value (D0002) at address number 01. (This command simply specifies the registers.)
[Command] STX$+ “01010WRS01D000255” +ETX$+CR$
D register number: D0002CPU number: 01
“OK” is returned as the response to the above command.
[Response] STX$+ “0101OK5C” +ETX$+CR$
IM 05C01E22-10E 3-17
WRM Monitors the D register and I relays on a word-by-word basis.
● Function
Reads register information that has 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. This error also occurs if the power supply is turned off.
• 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 the checksum, do not include the 2-byte checksum command element in the command.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Number of
Bytes
Response
element
1
STX2Address
number
(ADR)
1
STX2Address
number
(ADR)
2
CPU
number
01
2
CPU
number
01
1 0
2
OK
3
WRM
4
dddd14dddd2
2
Checksum1ETX1CR
… …
ddddn
4
2
Checksum1ETX1CR
The response is returned in a 4-digit character string (0000 to FFFF) in a hexadecimal pattern.
Read data of the number of words specified by the WRS command ddddn = character string in a hexadecimal pattern n = 1 to 16
● Example: Monitoring the measured input value of UT150L with address number 01 The following command monitors the measured input value (D0002) at address number 01.
(This command reads the statuses of the registers specified by the WRS command.)
[Command] STX$+ “01010WRME8” +ETX$+CR$
3-18
CPU number: 01
The measured input value 200 (00C8 (HEX)) is returned as the response to the above command.
[Response] STX$+ “0101OK00C837” +ETX$+CR$
Measured input value: 200
Chapter 3 PC Link Communication
■■
INF Reads the model, presence or absence of options, and revisions.
● Function
Returns the model number of UT150L, whether any options are included, and the version number and revision number are read.
• For the format of response in the event of failure, see subsection 3.1.2.
● Command/Response (for normal operation)
Number of
Bytes
Command
element
Number of
Bytes
Response
element
Response (continued)
4
Write start
register for
special device
1
STX2Address
number
(ADR)
1
STX2Address
number
(ADR)
4
Number of write
registers for
special device
2
CPU
number
01
2
CPU
number
01
Checksum1ETX1CR
Note: Model and option of UT150L
UT150L
1 0
2
OK
UT150L
2
01: Two alarms 04: Communication function 10: One contact input 20: 4-to-20 mA DC retransmission output
3
INF
(Note 1)
1 6
8
2
Checksum1ETX1CR
7
Version
Revision
(Note 2)
1
Space
4
Readout start
register for
special device
4
Number of
readout registers
for special device
Note: Version number and revision number
V0L. R01
Space
Revision number Version number
IM 05C01E22-10E 3-19

3.2.4 Response Error Codes

See Also
Subsection 3.1.2, Configuration of Response, for the structure of the response in the event of error.
The error codes (EC1) and detailed error codes (EC2) of response are as follows.
Table 3-3 List of Error Codes EC1
Error Code
02
03 Internal register
04 Out of setpoint range • A character other than 0 or 1 has been used for the bit setting.
05 Out of data number range • The specification of the number of bits or words is out of the range of use.
06 Monitor error • An attempt was made to execute monitoring without specifying the monitor
08 Parameter error 42 Sum error • The sum does not match the expected value. 43 Internal buffer overflow • A data value greater than specified is received. 44 Character reception time-out • The end-of-data or end-of-text character is not received.
Command error • No command exists.
specification error
Meaning
Causes
• Command not executable
• No register number exists.
• If a bit register (I relay) is used on a word-by-word basis, its specification is
not correct.
• A value other than 0000 to FFFF has been specified in the word specification.
• The position of a start for a data load, save, or other command, is out of the
address range.
• The number of data specified and the number of parameters for registers, etc. are not consistent.
(BRS or WRS).
• An illegal parameter is set.
Table 3-4 List of Detailed Error Codes EC2
Error Code
(EC1)
03 04 05 Out of data number range
08 Parameter error An illegal paraeter is set.
For error codes other than those noted as EC1, there is no EC2 meaning.
Device specification error Out of setpoint range
Meaning
Parameter number where error occurred (HEX) This is the number of a parameter in sequence that first resulted in error when counted from the leading parameter. Example: Error in device name specification
STX 01010BRW 05 I0017, 1, I0018, 0, A00502
Parameter numbers
In this case, EC1 = 03 and EC2 = 06
1 2 3 4 5 6
Detailed Error Code (EC2)
3-20
Chapter 3 PC Link Communication

3.3 Example of BASIC Program for Send and Receive

This section shows an example of a command sending and response receiving program created with Microsoft Quick BASIC*2 for PC/AT*1 (or compatible machines).
The communication conditions of the UT150L and those of the PC (e.g., communication rate) must agree with each other. Set the communication rate (baud rate) of the PC using the SWITCH command of MS-DOS*3. For how to use the SWITCH command, refer to the User’s Reference Manual of MS­DOS. Moreover, set the parity, character bit length, stop bit length, and so on using the OPEN statement.
*1 PC/AT is a product of IBM Corporation. *2 Microsoft Quick BASIC is a registered trademark of Microsoft Corporation. *3 MS-DOS is a registered trademark of Microsoft Corporation.
IM 05C01E22-10E 3-21
Example of the Program Created Using Microsoft Quick BASIC Version 7.1
(Reads the values in three D registers from register 0002.)
1000 ‘ === Main routine === 1010 STX$=CHR$(2) 1020 ETX$=CHR$(3) 1030 CR$=CHR$(13) 1040 RCVCHR$= “” 1050 fRCVEND=0 1060 fTIMEOUT=0
‘ Define ‘ Define ‘ Define ‘ Initialize receive character string ‘ Initialize flag ‘ Initialize flag
1070 ‘ 1080
SEND$=STX$+”01010WRDD0002,03"+ETX$
‘ Create character string for send
1090 ‘ 1100 1110 ON COM(1) GOSUB receivechr
OPEN “COM1:9600,N,8,1,ASC” FOR RANDOM AS #1
‘ Open a port ‘ Specify interruption processing during
receiving
1120 ON TIME(5) GOSUB timeout
‘ Specify interruption processing at timeout
1130 ‘ 1140 PRINT #1,SEND$ 1150 COM(1) ON 1160 TIMER ON
‘ Send ‘ Permit interruption during receive ‘ Start timer
1170 ‘ 1180 DO 1190 LOOP WHILE fRCVEND=0 AND fTIMEOUT=0
‘ Wait for receive end or timeout ‘
1200 ‘ 1210 TIMER OFF 1220 COM(1) OFF 1230 CLOSE #1
‘ Stop timer ‘ Prohibit interruption during receiving ‘ Close the port
1240 ‘ 1250 PRINT “>”+SEND$ 1260 PRINT “<”+RCVCHR$
‘ Display sent character string on screen ‘ Display received character string on
screen
1270 END
‘ END
1280 ‘ 1290 ‘ === Subroutine === 1300 receivechr: 1310 CHR1$=INPUT\(1,#1)
‘ Interruption processing during receiving ‘ Fetch characters from receive buffer
one by one
1320 IF CHR1$=CR$ THEN 1330 IF RCVCHR$=SEND$ THEN
‘ If received character string is “CR,” ‘ If received character string is the same
served command,
1340 RCVCHR$= “”
’ Initialize receive character string. (Echo
Back Processing)
1350 fRCVEND=0 1360 ELSE
‘ receiving flag remains initialized at 0. ‘ If received character string is different
from served command,
1370 fRCVEND=1 1380 END IF 1390 ELSE 1400 fRCVEND=0 1410 RCVCHR$=RCVCHR$+CHR1$ 1420 END IF
‘ receiving end flag is set. ‘ ‘ If it is a character other than CR, ‘
receiving end flag remains initialized at 0.
‘ Create received character string ‘
1430 RETURN 1440 ‘
3-22
Chapter 3 PC Link Communication
1450 timeout: 1460 fTIMEOUT=1 1470 RCVCHR$=”Time out ! (5 sec)”+CR$
‘ Timeout processing ‘ Set timeout flag ‘ Character string for display on screen
“Time out! (5 sec)”
1480 RETURN
↑
* The line numbers are not required. (They are simply provided for checking the number of program
steps.)
IM 05C01E22-10E 3-23
3-24

4. MODBUS Communication

4.1 Overview

Chapter 4 MODBUS Communication
Personal computer
Maximum overall cable length of 1200 m for a maximum of 31 substations
Figure 4-1 Connection of Slaves in MODBUS Communication
Use of the MODBUS communication enables UT150L to communicate with a wide variety of devices such as PCs. In this communication, you use such device to read/write data from/into D registers, (internal registers) of the UT150L.
Hereafter, PCs are generally called “host devices.”
See Also
Chapter 5 for information on the D registers.
For the MODBUS communication of the UT150L, we provide the ASCII mode (ASCII system) and RTU mode (binary system) for the communication mode.
Table 4-1 ASCII and RTU Modes
Item
Number of data bits
7 bits (ASCII)
ASCII Mode
RTU Mode
8 bits (binary) Message start mark Message end mark
Length of message (Note 1) Data time intervals
Error detection Note 1: When the length of a message in the RTU mode, it is assumed to be “N.”
Note 2: When the communication rate is 9600 bps, 1 9600 24 sec or less.
: (colon) CR + LF
2N + 1 1 second or less
Longitudinal redundancy check: LRC
Not necessary
Not necessary
N
24 bit time or less (Note 2)
Cyclic redundancy check: CRC-16
In the MODBUS communication, a higher-level device identifies each UT150L with a communication address of 1 to 99. Some of the commands used let you specify broadcast that requires no address numbers. For more information on broadcast specifications, see subsection 4.2.2.
IM 05C01E22-10E 4-1

4.1.1 Configuration of Message

Messages sent from a higher-level device to UT150L, consists of the following elements.
Element
Number of bytes in RTU mode Number of bytes in ASCII mode
Start of
Message
Mark
None
1
(1) (2) (3) (4) (5) (6)
Address Number
(ADR)
1 2
Function
Code
1 2
Data
2n 4n
Error
Check
2 22
End of
Message
Mark
None
(1)Start of Message Mark
This mark indicates the start of a message. Note that only ASCII mode requires the colon.
(2)Address Number (1 to 99)
Address numbers are used by host devices to identify the UT150L at the communication destination. (These numbers are identification numbers specific to individual UT150L.)
(3)Function Code (See subsection 3.2.1, List of Function Codes)
The function code specifies a command (function code) from the higher-level device.
(4)Data
This element specifies D register numbers, the number of D registers, parameter values, and so on in accordance with the function code.
(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
● Message format for communication
Example: When setting the target setpoint “50.0” to a UT150L, the higher-level device sends message data (01F4) into a value of “500” converted into hexadecimals not including the decimal point (thus, this is true for sending both 5.00 or 500).
Message data in the higher-level device: hexadecimal value of 500 (01F4)
Message data: 01F4
UT150L side
Target setpoint: 50.0
The position of the decimal point for “500” is determined by the DP (position of decimal point) parameter of the UT150L.
*
Response data from UT150L: 01F4
4-2

4.2 Communication with Host Device

The specification of D registers for a message using commercially available SCADA or the like and specification of D registers for a message in customer-created communication programs are different from simple specification of D register numbers. Thus, care should be taken.
(1) When using commercially available SCADA or the like, specify the D register numbers by
changing them into reference numbers. D register numbers whose “D” leading character is replaced with “4,” are treated as reference numbers. (When using a DDE server or others, specify these reference numbers.)
(2) For communication programs created by the customer, specify registers using the hexadecimal
numbers of values that are obtained by subtracting “40001” from the reference numbers. (Thus,
hexadecimal numbers are those to be specified.) Example: To specify target setpoint “D0120”: (1) For a message using commercially available SCADA or the like, specify reference number
“40120.” (2) For a message in a customer-created communication program, specify the hexadecimal number, or
0077, of a value (0119) obtained by subtracting 40001 from the reference number.

4.2.1 List of Function Codes

Chapter 4 MODBUS Communication
Function codes are command words used by the higher-level device to obtain the D register informa­tion of UT150L.
Table 4-2 List of Function Codes
Code Number
03
06
08 16
• A write using the function code is not possible for read-only or disabled D registers.
• Broadcast can be specified for function codes 06 and 16 only.
Reads data from multiple D registers.
Writes data into D register.
Performs loop back test. Writes data into multiple D registers.
Function
Description
Capable of reading data from a maximum of 32 successive D registers between D0001 and D0421.
Capable of writing data to one D register between D0101 and D0421.
See subsection 4.2.3, “Function Codes. Capable of writing data into a maximum of 32 successive D
registers between D0101 and D0421.
IM 05C01E22-10E 4-3

4.2.2 Specifying Broadcast

Note: The substations do not give any response.
Host controller (master station)
Maximum overall cable length of 1200 m for a maximum of 31 substations
Figure 4-2 Specifying Broadcast
Broadcast is a feature in which all connected UT150L can receive the command concerned. Specifying the number in Table 4-3 at the location of the address number in a message enables the higher-level device to write data into the D registers of all UT150L.
Table 4-3 Broadcast Specification Number
Number to be Specified in ADR
00 UT150L
The personal computer sends data to all of the substations at one time.
Applicable Devices
4-4

4.2.3 Function Codes

:
k
:
03 Reads data from multiple D registers.
● Function
This function code reads the contents of successive D registers by the specified number of them starting at a specified D register number.
• The maximum number of D registers to be read at a time is 32.
• For the format of responses in the event of failure, see subsection 4.2.4.
● Message (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Message (continued)
Number of
D Registers
(Upper Digit)
1
D Registers
(Lower Digit)
Start of
Message
Mark (:)
Number of
1
None
1
Address
Number (ADR)
Error
Check
2
Function Code
1
2
End of Message
Mark
(CR + LF)
None
(03)
1
2
Chapter 4 MODBUS Communication
D-Register Start
Number
(Upper Digit)
1
22
D-Register Start
Number
(Lower Digit)
1
2
2
2
2
● Response (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Response (continued)
Contents of
D Registers
(Upper Digit)
1
2
Contents of
D Registers
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
2
Address
Number
(ADR)
1
2
Error
Check
2
2
Function
Code
(03)
1
2
End of Message
(CR + LF)
Mark
None
2
Byte
Count
1
2
Contents of
D-Register
(Upper Digit)
1
22
Contents of
D-Register
(Lower Digit)
1
…
…
…
● Example: Reading the statuses of alarms 1 and 2 from the UT150L with address number 17. The following message reads four successive D registers starting at alarm 1 (D0101) and address number 17 in the ASCII mode.
[Message] [ :
]11030064000286[CR][LF]
Start of message mar
“11”: address number 17, “03”: function code 03, “0064”: D register address 0101, “0002”: number of D registers 2, and “86”: error check * Numbers in quotation marks are hexadecimal.
The following response is returned with respect to the above message.
[Response] [ :
]110304005A000A84[CR][LF]
Setting of alarm1, alarm2
“04”: byte count, “005A”: alarm 1 setpoint 90, “000A”: alarm 2 setting 10
IM 05C01E22-10E 4-5
16 Writes data into D registers.
:
k
:
● Function
This function code writes data into successive D registers by the number of specified D registers from a specified D register number.
• The maximum number of D registers into which data is written at a time is 32.
• For the format of response in the event of failure, see subsection 4.2.4.
• Lets you specify broadcast (by setting “00” to the address number).
● Message (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Massage (continued)
Number of
D Registers
(Upper Digit)
1
Start of
Message
Mark (:)
None
1
Number of
D Registers
(Lower Digit)
1
Address
Number
(ADR)
Byte
Count
1
1
2
(Upper Digit)
Function Code
Data
1
(10)
1
2
Data
(Lower Digit)
1
D-Register Start
Number
(Upper Digit)
1
22
…
…
D-Register Start
(Lower Digit)
Error
Check
2
Number
1
End of Message
(CR + LF)
Mark
None
22
2
2
2
…
2
2
● Response (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Response (continued)
Number of D
Registers
(Upper Digit)
1
2
Number of D
Registers
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
2
Error
Check
2
2
Address
Number
(ADR)
1
2
End of Message
(CR + LF)
Function Code
(10)
1
2
Mark
None
2
D-Register Start
Number
(Upper Digit)
1
22
D-Register Start
Number
(Lower Digit)
1
● Example: Setting a alarm-1 setpoint of 80, and a alarm-2 setpoint of 70 to UT150L with address
number 02. The following message writes values 80, and 70 in this order in the ASCII mode, starting at the proportional band (D0101) of address number 02.
[Message] [ :
]0210006400020400500046EE[CR][LF]
Start of message mar
“02”: address number 02, “10”: function code 16, “0064”: starts register address 0101, “0002”: number of D registers 2, “04”: byte count, “0050”: alarm-1 setpoint 80, “0046”: alarm-2 setpoint 70, and “EE”: error check * Numbers in quotation marks are hexadecimal.
4-6
The following response is returned with respect to the above message.
[Response] [ :
]02100064000288[CR][LF]
Number of D registers: 2
Chapter 4 MODBUS Communication
:
k
:
06 Writes data into D register.
● Function
This function code writes data into a specified D register number.
• The maximum number of D registers into which data is written at a time is 1.
• For the format of response in the event of failure, see subsection 4.2.4.
• Lets you specify broadcast (by setting “00” to the address number).
● Message (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Message (continued)
Write Data
(Upper Digit)
1
Write Data
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
Error
Check
2
Address
Number
(ADR)
1
2
End of Message
(CR + LF)
Function Code
(06)
1
2
Mark
None
D-Register
Number
(Upper Digit)
1
22
D-Register
Number
(Lower Digit)
1
2
2
2
2
● Response (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Response (continued)
Write Data
(Upper Digit)
1
2
Write Data
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
2
Error
Check
2
2
Address
Number
(ADR)
1
2
End of Message
Function Code
Mark
(CR + LF)
None
2
(06)
1
2
D-Register
Number
(Upper Digit)
1
22
D-Register
Number
(Lower Digit)
1
● Example: Setting 70.0 to the target setpoint of UT150L with address number 01. The following message writes “700” to the target setpoint (D0120) at address number 01 in the ASCII mode.
[Message] [ :
]0106007702BCC4[CR][LF]
Start of message mar
“01”: address number 01, “06”: function code 06, “0077”: D-register address 0120, “02BC”: target setpoint 70.0, and “C4”: error check * Numbers in quotation marks are hexadecimal.
The response of the same contents is returned with respect to the above message.
[Response] [ :
IM 05C01E22-10E 4-7
]0106007702BCC4[CR][LF]
Target setpoint: 70.0
08 Performs a loop back test.
:
k
:
● Function
This function code is used to check connection for communication.
• For the format of response in the event of failure, see subsection 4.2.4.
• The specification of a D register number (marked with an asterisk below) for a loop back test is “00” (fixed).
• Any value can be selected for send data.
● Message (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Message (continued)
Send Data
(Upper Digit)
1
Send Data
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
Error
Check
2
Address
Number
(ADR)
1
2
End of Message
(CR + LF)
Function Code
(08)
1
2
Mark
None
00
(Upper Digit)
1
22
00
(Lower Digit)
1
2
2
2
2
● Response (for normal operation)
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
Response (continued)
Send Data
(Upper Digit)
1
2
Send Data
(Lower Digit)
Start of
Message
Mark (:)
None
1
1
2
Error
Check
2
2
Address
Number
(ADR)
1
2
End of Message
(CR + LF)
Function Code
(08)
1
2
Mark
None
2
00
(Upper Digit)
1
22
00
(Lower Digit)
1
● Example: Sending data 1234h to UT150L with address number 05 to check connection for
communication.
The following message sends “1234” (hexadecimal) to address number 05 in the ASCII mode.
[Message] [ :
]050800001234AD[CR][LF]
Start of message mar
4-8
“05”: address number 05, “08”: function code 08, “0000”: fixed, “1234”: send data, and “AD”: error check * Numbers in quotation marks are hexadecimal.
When connection for communication is normal, the following response is returned with respect to the above message.
[Response] [ :
]050800001234AD[CR][LF]
“1234”: send data

4.2.4 Response Error Codes

● Message Format in the Event of Error
If there is any inconsistency other then communication errors in a message, UT150L does nothing, but returns the following message.
Chapter 4 MODBUS Communication
Element
Number of bytes in
RTU mode
Number of bytes in
ASCII mode
The function code contains a function code (hexadecimal number) + 80 (hexadecimal number).
*
Address Number
(ADR)
1
2
Function Code*
1
2
Error Code
1
2
Error Check
2
2
● Error Codes in Response
Table 4-4 List of Error Codes
Error Code
01 02
03 D-register count error Number of D registers has been specified, being out of the range.
Function code error D-register address error
Meaning
No function code exists. Address out of the range has been specified.
Description
● Even when a message is sent, no response returns if:
• Retransmission error (overrun, framing, parity, LRC, or CRC-16 error) was detected.
• Address in an instructed message is incorrect.
• Interval between data composing a message was 1 second or more.
• Broadcast is specified (address number: 00).
* As a measure against those, provide a timeout process in the communication functions of a higher-
level device or in communication programs.
IM 05C01E22-10E 4-9
4-10
Chapter 5 Functions and Usage of D Registers

5. Functions and Usage of D Registers

5.1 Overview of D Registers

This section explains the functions and usage of D registers. The D registers store the parameter data, flag data and process data that are handled by UT150L
controller. By connecting UT150L controller to host devices capable of PC link communication, or MODBUS communication, you can readily use these internal data items by reading from or writing to the D registers.
Using the D registers, you can perform:
• Centralized control using host devices
• Data exchange by reading/writing using host devices

5.2 Interpretation of Lists of D Registers (D Register Map Tables)

This section explains how to read the “D Register Map” tables in this chapter. In the example shown below, the number in the leftmost column denotes (1) D-register number. The five-digit number in the column on the immediate right of the leftmost column represents (2) Reference number for MODBUS communication. The number in the column third from left is (3) Register number (hexadecimal) for the MODBUS communication program. Each register code name in the D Register Map tables represents register name of specific process data item, operating parameter, setup parameter or other data items. For details on the operating and setup parameters, see Model UT150L Limit Controller instruction manual (IM 05C01E22-01E).
Name of D Register Map
D-Reg No.
D0001
(1) D register number (3) Hex number (for MODBUS communication)
Ref No.
40001
(2) Reference number (for MODBUS communication)
H No.
0000
Register name
STATUS R
R/W
*
Reading/writing via communication (R: reading; W: writing)
An asterisk (*) indicates that the number of writing actions is limited to 100,000 times.
IM 05C01E22-10E 5-1

5.3 Classification of D Registers

■ Classification of D Register Map Tables
The table below outlines how the D registers are classified by their numbers in the D Register Map tables.
Table 5-1 Classification of D Registers
Register No.
D0001 to 0010
D0401 to 0420
D0011 to 0100 D0121 to 0200 D0216 to 0300 D0307 to 0400
D0101 to 0120
D0201 to 0215
D0301 to 0306
Note 1: Data for process values, operating parameters and setup parameters are stored as the types (EU, EUS, % and ABS without
the decimal point) indicated in the "Operating Parameters" and the "Setup Parameters" of the UT150L Limit Controller in­struction manual. The OFF and ON states are represented by 0 and 1, respectively. The D registers D0401 to 0420 are read-only.
Note 2: The user area (register numbers D0401 to 0420) is reserved for 16-bit register data used in other software programs.
When working with host devices, do not write to or read from this area as usually done.
Process data area (Note 1)
User area (Note 2), represented by shaded section in the table ( )
Must not be used.
Operating parameters
1
area * Setup parameters area
1
*
Area and Data Categories
Operating data
–
Operating parameter
Setup parameter
PV, CSP and other values
Used for communication with the Host devices.
FL, BS etc.
AL, HY etc.
Description
Reference
Section
5.4
Section
5.4
Section
5.4
Section
5.4
NOTE
No data may be written to or read from data storage areas with blank fields in the tables that follow. If you attempt to do so, UT150L controller may fail to operate correctly.
5-2

5.4 Register Map Table

g
D-Reg No. Ref No. H No. Register Name R/W D-Reg No. Ref No. H No. Register Name R/W D0001 40001 0000 STATUS R D0216 to 0300 D0002 40002 0001 PV R D0301 40301 012C IN *R/W D0003 40003 0002 CSP R D0302 40302 012B DP *R/W D0004 D0303 40303 012E RH *R/W D0005 D0304 40304 012F RL *R/W D0006 D0305 40305 0130 SPH *R/W D0007 D0306 40306 0131 SPL *R/W D0008 D0313 to 0400 D0009 40009 0008 TIM R D0401 40401 0037 R/W D0010 40010 0009 MOD R D0402 40402 0038 R/W D0011 to 0100 D0403 40403 0039 R/W D0101 40101 0064 A1 *R/W D0404 40404 003A R/W D0102 40102 0065 A2 *R/W D0405 40405 003B R/W D0103 D0406 40406 003C R/W D0104 D0407 40407 003D R/W D0105 D0408 40408 003E R/W D0106 D0409 40409 003F R/W D0107 D0410 40410 0040 R/W D0108 D0411 40411 0041 R/W D0109 D0412 40412 0042 R/W D0110 D0413 40413 0043 R/W D0111 40111 006E HYS *R/W D0414 40414 0044 R/W D0112 D0415 40415 0045 R/W D0113 D0416 40416 0046 R/W D0114 40114 0071 SP1 *R/W D0417 40417 0047 R/W D0115 D0418 40418 0048 R/W D0116 40116 0073 FL *R/W D0419 40419 0049 R/W D0117 40117 0074 BS *R/W D0420 40420 004A R/W D0118 40118 0075 LOC *R/W D0119 D0120 40120 0077 CSP1 R/W D0121 to 0200 D0201 D0202 D0203 40203 00CA AL1 *R/W D0204 40204 00CB AL2 *R/W D0205 40205 00CC HY1 *R/W D0206 40206 00CD HY2 *R/W D0207 40207 00CE DIS *R/W D0208 40208 00CF HILO *R/W D0209 40209 00D0 OPSL *R/W D0210 40210 00D1 PSL *R/W D0211 40211 00D2 ADR *R/W D0212 40212 00D3 BPS *R/W D0213 40213 00D4 PRI *R/W D0214 40214 00D5 STP *R/W D0215 40215 00D6 DLN *R/W
Shaded areas indicate a user area (D-register numbers D0401 to D0420). These registers are not available if the host devices.
An asterisk ( * ) indicates that the number of writin
Chapter 5 Functions and Usage of D Registers
Area for Process Data
actions is limited to 100,000 times
IM 05C01E22-10E 5-3

5.4.1 D Register Contents

D registers are designed to indicate two or more events, such as errors and parameter data, using combinations of bits within them. If any of the events shown in the following tables occurs, the corresponding bit is set to 1. The bit remains set to 0 if the event has not occurred yet. Note that bits in blank fields are not in use.
● D0001 Register - Bit Configuration of STATUS (Input Error)
Bit Code Event
0 ALM1.st ‘1’ if alarm 1 is on, or ‘0’ if off 1 ALM2.st ‘1’ if alarm 2 is on, or ‘0’ if off 20 30 4 PV+over.st PV above the upper limit of scale 5 PV-over.st PV below the lower limit of scale 6 BO.st Burn-out error 70 8 SYSTEM.E.st Error in system data 9 CALB.E.st Error in calibrated values 10 PARA.E.st Error in operating parameters 11 0 Error in automatical calibration of valve position 12 ADERR.st Error in A/D Converter 13 RJCERR.st RJC error in PV 14 EEP.E.st Error in EEPROM 15 0
● D0002 Register - PV (Measured Input Value)
● D0003 Register - CSP (Currently used Target Setpoint)
● D0009 Register - TIM (Duration Time)
Example: The reading for one hours, 38 minutes and 57 seconds is given as 5.937 seconds.
● D0010 Register - MOD (Limit Control Status)
Bit Code Event 00 1 EXD. st 0:Not extend, 1:Extend 2 OUT. st 0:Relay off/Lamp on, 1:Relay on/Lamp off 3 to 15 0
● D0101 and D0102 Registers - A1 and A2 (Alarm or Timer Setpoints)
If either “23” or “24” is set in the AL1 and AL2 registers, the value is used as the setpoint for the timer in units of seconds. If a value other than “23” and “24” is set, it is used as the alarm setpoint.
● D120 Register-CSP1 (Target Setpoint for writing via Communication Only)
The CSP1 parameter is a target setpoint for use via communication only and is effective only if the SP1 parameter is selected. Use this register when you want to change the target setpoint by means of communication. Once you write a value into this register, the D0114 (SP1) register contains the same value. Note that data in the D0120 register is not recorded when the power is turned off. When the power is turned back on, the D0120 register contains the value previously written into the D0114 (SP1) register.
5-4
Chapter 6 Functions and Usage of I Relays

6. Functions and Usage of I Relays

This chapter explains the functions and usage of the I relays. The I relays contain information on errors in UT150L controller, as well as the controller’s alarm
statuses. By connecting the UT150L controller to host devices (via PC communication link), you can read these internal data items from the I relays to use for your own particular purpose. (Note that most of the I relays have the same functions as the D registers.)

6.1 Status I Relays

The following table summarizes how the on-off status I relays are classified.
I Relay No.
1 to 16, 50, 51
17 to 48
Data Category
On-off statuses
Read/Write
Description
Error information (same as data in the D0001 register)
User area (Data can be written to or read from the range of I relays)
Remarks
Information stored in each group of these I relays is represented by the four sets of binary codes, from 0000 (0 in the decimal system) to 1000 (8 in the decimal system), which are formed by each combination of four I relays. The lowest-numbered I relay in each set signifies the LSB of the four bits.
NOTE
The on-off status I relays numbered 1 to 16 store on-off status information. In normal operation, this area can be accessed to read the on-off status. When specifying an I relay number via communication, begin the number with an upper-case letter I. For example, type I0014 to specify the RJCERR.st relay (I relay numbered 14).
No data may be written to or read from data storage areas with blank fields in the tables that follow. If you attempt to do so, UT150L controller may fail to operate correctly.
Area of I Relays
No.
1 2 3 4 5 6 7 8
9
10
I Relay
Name Code
ALM1.st ALM2.st
PV+over.st PV-over.st BO.st
SYSTEM.E.st CALB.E.st
I Relay
No.
Name Code
11
PARA.E.st 12 13
ADERR.st 14
RJCERR.st 15
EEP.E.st 16
17
UR1 27
18
UR2
19
UR3
20
UR4
No.
21 22 23 24
25 26
28 29 30
I Relay
Name Code
UR5 UR6 UR7 UR8
UR9 UR10 UR11 UR12 UR13 UR14
I Relay
No.
Name Code
31
UR15
32
UR16
33
UR17 43
34
UR18
35
UR19
36
UR20
37
UR21
38
UR22
39
UR23
40
UR24
No.
41 42
44 45 46 47 48 49 50 EXD
I Relay
Name Code
UR25 UR26 UR27 UR28 UR29 UR30 UR31 UR32
No.
51 52 53 54 55 56
I Relay
Name Code
OUT
IM 05C01E22-10E 6-1
6-2
Appendix
Table of ASCII Codes (Alphanumeric Codes)
In order to implement PC link communication, create a transmission/receiving program by referring to the following table of ASCII codes.

Appendix Table of ASCII Codes (Alphanumeric Codes)

b8
b7
b6 b5
Note: SP ($20): space DEL ($7F): control code
b4
0
0
0
0
0
0
1
0
b1
b2
b3
0
0 0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
0
0 0
1 0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
0
1
0
0
1
1
1
0
1
DLE
NUL
0
DC1
SOH
1
DC2
STX
2
DC3
ETX
3
DC4
EOT
4
NAK
ENQ
5
SYN
ACK
6
ETB
BEL
7
CAN
BS
8
EM
HT
9
SUB
LF
A
ESC
VT
B
FF CR SO
SI
FS GS RS US
C D E
F
Control codes Character codes
SP
%
0
0
@
0
0
1
1
0
0
0
1
4
5
P
A
Q
B
R S
C D
T
E
U V
F G
W
H
X
I
Y
J
Z
K
[
L
¥
M
]
N
•
O
_
0
1
1
1
1
0
1
6
7
p
`
a
q
b
r
s
c d
t
u
e
v
f
g
w
x
h
i
y
j
z
k
{
l
|
m
}
–
n
DEL
o
0
0
0
1
1
1
0
2
3
0 1
!
2
“
3
#
4
$
5 6
&
7
‘
8
(
9
)
:
*
;
+
,
<
–
=
.
> ?
/
IM 05C01E22-10E App. 1
App. 2

Revision Record

● Manual No. : IM 05C01E22-10E (3rd Edition)
● Title : Model UT150L Communication Functions
Edition Date Revised Item
First Oct., 2000 Newly published
Second Sep., 2003 Correct
Third Jun., 2004 Change of the company name.
Written by Yokogawa Electric Corporation
Published by Yokogawa Electric Corporation
2-9-32 Nacacho, Musashino-shi, Tokyo 180-8750, JAPAN
i
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