Toshiba PROSEC T2 User Manual
PROGRAMMABLE CONTROLLERS
UG-TS02∗∗∗-E022
PROSEC T2-Series
USERS MANUAL
− Modbus Module −
TOSHIBA CORPORATION
Important Information
Misuse of this equipment can result in property damage or human injury.
Because controlled system applications vary widely, you should satisfy yourself
as to the acceptability of this equipment for your intended purpose.
In no event will Toshiba Corporation be responsible or liable for either indirect
or consequential damage or injury that may result from the use of this equipment.
No patent liability is assumed by Toshiba Corporation with respect to use of
information, illustrations, circuits, equipment or examples of application in this
publication.
Toshiba Corporation reserves the right to make changes and improvements to this
publication and/or related products at any time without notice. No obligation shall be
incurred other than as noted in this publication.
This publication is copyrighted and contains proprietary material. No part of this book
may be reproduced, stored in a retrieval system, or transmitted, in any form or by any
means ⎯ electrical, mechanical, photocopying, recording, or otherwise ⎯ without
obtaining prior written permission from Toshiba Corporation.
© TOSHIBA Corporation 1998. All rights reserved
PROSEC and TOSLINE are registered trademarks of TOSHIBA Corporation.
Publication number: UG-TSxx∗∗∗-Exxx
1st edition August 1992
2nd edition March 1999
Page ii
Safety Precautions
This application guide is prepared for users of Toshiba programmable controller PROSEC
T2-Series and EX100 Series (hereafter called T2).
Read this guide and your PLC's manual thoroughly to use the PLC system safely.
Hazard Classifications
In this guide, the following two hazard classifications are used to explain the safety
precautions.
!
WARNING
!
CAUTION
Even if a precaution is classified as CAUTION, it may cause serious results
depending on the situation. Observe all the safety precautions described on this
guide.
Safety Precautions
• Read the Safety Precautions described in your PLC's User's Manual before
using the PLC.
• Carefully design a fail-safe system in order to avoid an unsafe situation caused
by PLC failure. When the PLC detects an error in its self-diagnostics, the PLC
goes into the error mode. In the error mode, all the PLC outputs turn OFF and
the analog outputs go to 0 (zero).
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury. It may also be used to
alert against unsafe practices.
!
CAUTION
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About This Guide
This guide describes how to setup and use the Toshiba EX10-MML11 Modbus module. When
used in a Modbus network, the EX10-MML11 module allows any Modbus master to write
to/read from the registers in an EX100 or T2 PLC using standard Modbus RTU protocol.
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Contents
Important Information................................................................................................................ii
Safety Precautions................................................................................................................... iii
About This Guide.....................................................................................................................iv
Contents ...................................................................................................................................v
1. Overview..............................................................................................................................1
2. System Configuration...........................................................................................................2
3. External Features and Switch Settings................................................................................4
4. Specifications.......................................................................................................................5
5. Modbus Module Operation....................................................................................................6
5.1. Modbus Commands......................................................................................................6
5.2. Modbus Data Types and T2 Register Mapping.............................................................7
5.3. Restricted Registers......................................................................................................8
6. Modbus Module Setup..........................................................................................................9
6.1. Modbus Module DIP Switch Settings ............................................................................9
6.2. Wiring Connection to the Modbus Module...................................................................14
7. CPU Setup for the Modbus Module...................................................................................15
8. Trouble Shooting ...............................................................................................................16
9. Additional References........................................................................................................17
Page v
1. Overview
The Modbus module (ML11) is used to connect T2E, T2N, or EX100 PLCs to a Modbus
Master. The addition of the EX10-MML11 (MODBUS Module) allows the T2E, T2N or EX100
PLC to communicate via standard MODBUS RTU protocol. This allows quick and easy
access to the PLC registers by a standard MODBUS Master.
Using the ML11 Modbus module any Modbus Master can read the status of registers in the
PLC and write to registers in the PLC. This allows the Modbus Master to know the status of
inputs to the PLC (both digital and analog) and to control the outputs of the PLC (also both
digital and analog).
The ML11 Modbus module cannot be a Modbus master, only a modbus slave. It has one
RS485 port for connection to the Modbus master. The preferred location of the EX10-MML11
is next to the CPU. However, the module may be located in any slot to the right of the CPU.
The CPU module can be any of the following:
EX10-MPU11 EX100 CPU, now obsolete
EX10-MPU12A EX100 CPU, now obsolete
TPU215—S T2 CPU now obsolete
TPU224--S T2 CPU, now obsolete
TPU234E-S T2E CPU (replaces all obsolete CPUs)
TPU215N-S T2N CPU, basic
TPU235N-S T2N CPU, with Ethernet
TPU245N-S T2N CPU, with Ethernet and Tosline S20
The ML11 Modbus module is also used to connect a T2 or EX100 PLC into the Toshiba
ECBUS. The ECBUS allows the PLCs to share data with Toshiba’s EC300 series loop
controllers. The ECBUS is a LAN (local area network) which allows multiple EC300s and
T2/EX100 PLCs to share data. For more information on the ECBUS, please refer to ECBUS
Transmission Interface Manual, see Additional References.
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y
2. System Configuration
From 1 to 32 T2E or T2N PLCs can be connected to a Modbus master using the Modbus
module.
1 to 1 Configuration
Modbus Master
1. Higher Level PLC
2. Distributed Control System
3. Computer with SCADA or
RS485
T2E PLC
HMI Program
I/O Modules
Modbus Module
T2E CPU
Power Suppl
T2 Minimum
Configuration
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