Siemens SIMATIC TI500 User manual

SIMATIC TI500/TI505
TIWAY 1 Gateway
User Manual
Order Number PPX:TIWAY-8104-02
Manual Assembly Number: 2587871-0004
Second Edition

01/21/92
Copyright 1992 by Siemens Industrial Automation, Inc.
All Rights Reserved — Printed in USA
Reproduction, transmission or use of this document or
contents is not permitted without express consent of
Siemens Industrial Automation, Inc. All rights, including rights
created by patent grant or registration of a utility model or
design, are reserved.
Since Siemens Industrial Automation, Inc. does not possess
full access to data concerning all of the uses and applications
of customer ’ s products, we do not assume responsibility either
for customer product design or for any infringements of patents
or rights of others which may result from our assistance.
T echnical data is subject to change.
W e check the contents of every manual for accuracy at the
time it is approved for printing; however , there may be
undetected errors. Any errors found will be corrected in
subsequent editions. Any suggestions for improvement are
welcomed.

MANUAL PUBLICA TION HISTOR Y
SIMATICTI500/TI505 TIW A Y I Gateway User Manual
Or der Manual Number: PPX:TIW AY–8104–2
Refer to this history in all correspondence and/or discussion about this manual.
Event Date Description
Original Issue 09/85 Original Issue (2491964–0001)
Second Edition 09/92 Second Edition (2491964–0002)

LIST OF EFFECTIVE P AGES
Pages Description Pages Description
Cover/Copyright Second
History/Effective Pages Second
iii — x Second
1-1 — 1-4 Second
2-1 — 2-12 Second
3-1 — 3-14 Second
A-1 — A-4 Second
B-1 — B-3 Second
C-1 — C-28 Second
D-1 — D-11 Second
Index-1 — Index-3 Second
Registration Second

Contents iii
Contents
Preface
Chapter 1 Product Overview
1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Gateway Inter face 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Distributed Contr ol Systems 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Basic Operating Featur es 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Ports 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Translating Commands between Host and PLC Network 1-4. . . . . . . . . . . . . . . . . . . . . . . . . .
Data T ransmission Rates Supported 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of Data Accessed 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2 Network Installation
2.1 TIWAY I Network and Gateway Installation Checklist 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Refer ence Installation Steps 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Installation Pr ocedures 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements for Installing the Gateway 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Network Media Installation — Local Line 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line Cable Characteristics 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TIWAY I Network Characteristics 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line Har dwar e Components 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tap Housing 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminating the Main Line Cable 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Twisted-Pair Cabling 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Important Planning Considerations 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line T ap Spacing Rules 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Considerations 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Primary Rule 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Double Dr ops 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Dr ops 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multidrop Taps 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Routing 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Obstructions 2-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noise A voidance 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Network Media Installation — RS-232-C Modem Inter face 2-12. . . . . . . . . . . . . . . . . . . . . . . . .
Data T ransmission Characteristics 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232 Pin Assignments 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iv Contents
Chapter 3 Gateway Installation and Configuration
3.1 Installing the TIW A Y I Gateway 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Mounting Guidelines 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Connections and Initialization 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Dipswitch Configuration and Function 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dipswitch Settings for the Host Inter face Port 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dipswitch Settings for the Network Interface Port 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Switches and Indicator Lights 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Online/Offline Switch 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Self-Test Button 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset Button 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Indicator Lights 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gateway Good 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comm Active 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Online 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receive 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmit 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Mode 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Diagnostic T ests 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Built-In Diagnostic T ests 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-On Test 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operational Diagnostic T est 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
User-Initiated Test 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burn-In and Final T ests 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A Data Type Identification
A.1 Corresponding Data T ypes A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.2 SIMATIC TI PLCs Supported by TIW A Y I Gateway A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A.3 TIWAY I Gateway Specifications A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix B System Configuration Forms
B.1 System Configuration B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2 V-Memory Of fset T ables B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents v
Appendix C Modbus Commands
C.1 Modbus Pr otocol Overview C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The R TU T ransmission Frame C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message Delineation C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Addr ess Field C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Function Field C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Data Field C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checksum C-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Invalid Characters and Messages C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Modbus Functions C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Addressing C-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Address Limits C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.2 Modbus Function Descriptions C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction C-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 01 — Read Coil Status C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 02 — Read Input Status C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 03 — Read Output Registers C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 04 — Read Input Registers C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 05 — W rite a Single Coil C-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 06 — W rite a Single Register C-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 07 — Read Exception Status C-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 08 — Execute Diagnostics C-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 11 — Get Comms Event Counter C-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 12 — Get Comms Event Log C-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 15 — W rite Multiple Coils C-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Code 16 — W rite Multiple Registers C-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.3 User-Defined Modbus Commands C-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command 65 — Read C Memory C-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command 66 — Read K Memory C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Command 67 — Read WY Memory C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C.4 Error Responses C-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D Configuring the PLC for Fisher PROVOX
D.1 Considerations for Configuring a TIW A Y I/PROVOX System D-2. . . . . . . . . . . . . . . . . . . . . . . . .
PLC Configuration Requir ements D-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network Design Considerations D-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D.2 PLC Programming Considerations D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blocking Network Data D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Writing to Integer Registers D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Writing to Discr ete Points D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC Status Register D-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D.3 PLC Pr ogramming Example D-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data to be Accessed D-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Ladder Logic Pr ogram D-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vi Contents
List of Figures
1-1 TIWAY I Gateway as Inter face Between PLC Network and Host System 1-2. . . . . . . . . . . . .
1-2 TIWAY I Gateway 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Basic Installation and Set-up Steps 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Number of Local Line Secondaries vs. Cable Distance 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 TIWAY I T ap Housing 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Terminating the Local Line 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Basic T ap Spacing Rules 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 Additional T ap Spacing Rules 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Possible Bracket Locations for Mounting Gateway 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 AC Power Connections 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Dipswitch Settings for the Network and Host Ports 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Dipswitch Settings for Network Data T ransmission Rates 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Gateway Operation Switches 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Indicator Lights 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Indicator Status 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1 RTU T ransmission Frame C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 Bit Orientation C-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-3 Read Coil Status Example — Request C-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-4 Read Coil Status Example — Response C-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-5 Read Coil Status Example — Data Field C-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-6 Read Input Status Example — Request C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-7 Read Input Status Example — Response C-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-8 Read Input Status Example — Data Field C-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-9 Read Output Register Example — Request C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-10 Read Output Register Example — Response C-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-11 Read Input Register Example — Request C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-12 Read Input Register Example — Response C-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-13 Write a Single Coil Example — Request C-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-14 Read Input Register Example — Response C-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-15 Write a Single Register Example — Request C-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-16 Write a Single Register Example — Response C-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-17 Read Exception Status Example — Request C-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-18 Read Exception Status Example — Response C-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-19 Exception Status Bits C-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-20 Execute Diagnostics Example — Request C-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-21 Execute Diagnostics Example — Response C-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-22 Get Comms Event Counter Example — Request C-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-23 Get Comms Event Counter Example — Response C-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-24 Get Comms Event Log Example — Request C-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-25 Get Comms Event Log Example — Response C-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents vii
C-26 Write Multiple Coils Example — Request C-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-27 Coil Bit Patter n C-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-28 Write Multiple Coils Example — Response C-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-29 Write Multiple Registers Example — Request C-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-30 Write Multiple Registers Example — Response C-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-31 Command 65 — Request C-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-32 Command 65 — Response C-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-33 Command 66 — Request C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-34 Command 66 — Response C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-35 Command 67 — Request C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-36 Command 67 — Response C-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-37 Exception Response Frame C-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

viii Contents
List of T ables
1 TIWAY I Gateway Models ix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Data T ransmission Rates Supported 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 Pin Assignments for Local Line Connector 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 RS-232-C Connector Pin Assignments 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Host Port Dipswitch Configuration 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Network Port Dipswitch Configuration 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Data T ransmission Rates Supported 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 RS-232-C/423 Loopback Connections 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Indicator Status after User-Initiated T est 3-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1 Data T ype Identification A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-2 SIMATIC TI PLCs Supported and Accessible Data A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-3 TIWAY I Gateway Featur es A-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-4 TIWAY I Gateway Physical and Envir onmental Specifications A-4. . . . . . . . . . . . . . . . . . . . . .
B-1 System Configuration For m B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-2 V-Memory Of fset T able (Resident Infor mation) B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-3 V-Memory Of fset T able (Received Infor mation) B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1 Modbus Functions Supported C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-2 RTU Timing C-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-3 Terminology Dif ferences C-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-4 Diagnostic Codes Supported C-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-5 Event Byte T ypes C-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-6 Exception Responses C-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1 PLC Data to be Accessed D-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-2 V-Memory Block D-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface ix TIWAY I Gateway User Manual
Preface
This manual describes the basic features, operation, and installation of the
TIWAY I Gateway  . The Gateway provides an interface between the
SIMATIC TIW A Y I network and a distributed control system host using
Modbus protocol.
The TIW A Y I Gateway translates Modbus commands from a host into the
TIWA Y I protocol format. Since the Modbus and TIW A Y I systems are
entirely different in protocol and interface requirements, the Gateway
serves as a protocol translator and as a type of network monitor .
For example, the TIW A Y I Gateway can provide protocol translation for the
following host systems.
• The Honeywell TDC 2000

Data Highway Port (DHP) with one
Gateway can monitor up to eight programmable controller (PLC)
stations with one Network Interface Module (NIM) for each PLC.
• The Foxboro SPECTRUM  FOXNET

Device Interface (FDG) with
one Gateway can monitor up to 64 stations equipped with NIMs.
• The Fisher PROVOX

Programmable Controller Interface Unit
(PCIU) can monitor up to 8 stations with NIMs.
The TIW A Y I Gateway is available in four models, offering a choice of
communication ports and voltage supplies, as listed in T able 1.
T able 1 TIWA Y I Gateway Models
Model Number Communication Ports Supply Voltage
PPX:500–7301 RS-232-C/Local Line 120 V AC
PPX:500–7302 Dual RS-232-C 120 V AC
PPX:500–7303 RS-232-C/Local Line 240 V AC
PPX:500–7304 Dual RS-232-C 240 V AC
NOTE: These models replace the previously available model PPX:500–7200
series of the TIW
A Y I Gateway .
Purpose of this
Manual
Gateway System
Capacities
TIWA
Y I Gateway
Models

Preface
xTIWAY I Gateway User Manual
The information in this manual is supplemented by the following Siemens
manuals. Y ou may find it helpful to refer to these or other related manuals
when using the TIW A Y I Gateway .
•TIWAY
I Systems Manual (2587871–0001)
•TIWA Y I Series 505  Network Interface User ’ s Manual (2587871–0053)
•TIWA Y I Series 500  Network Interface User ’ s Manual (2587871–0054)
•SIMATIC TI520C /TI530C/TI530T Manual Set (2462158–0026)
•SIMATICTI545 Manual Set, V olumes 1 and 2 (2586546–0023)
•SIMA TIC TI545 System Manual (2586546–0053)
•SIMATICTI560T/TI565T System Manual (2597773–0035)
•SIMATICTI500/TI505 TISOFT2  Release 4.2 User Manual
(2588081–0019)
Y
ou should also refer to the appropriate user manual(s) for the Modbus host
system’ s device interface.
Related Manuals

Product Overview 1-1 TIWAY I Gateway User Manual
Chapter 1
Product Overview
1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The Gateway Inter face 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Distributed Contr ol Systems 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Basic Operating Featur es 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface Ports 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Translating Commands between Host and PLC Network 1-4. . . . . . . . . . . . . . . . . . . . . . . . . .
Data T ransmission Rates Supported 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of Data Accessed 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Overview
1-2 TIWAY I Gateway User Manual
1.1 Introduction
The TIW A Y I Gateway allows a TIW A Y I network of PLCs to be hosted by a
Modbus-compatible host system. Figure 1-1 shows the relationship of the
Gateway to one of several possible Modbus-compatible host systems.
The Foxboro SPECTRUM, Fisher PROVOX, and Honeywell TDC 2000 are
distributed control systems which have interfaces to PLCs. These systems
primarily perform supervisory control and data acquisition functions to the
PLCs, using an RS-232-C type of connection into PLC data highways.
For example, the Honeywell TDC 2000 system communicates with the
Gateway by way of a Data Highway Port (DHP), the Fisher PROVOX
system uses a Programmable Controller Interface Unit (PCIU), and the
Foxboro SPECTRUM system uses a FOXNET Device Interface (FDG).
I000000
Foxboro
SPECTRUM
Fisher
PROVOX
Honeywell
TDC 2000
MODBUS
Compatible
Host System
or
or
or
TIWA Y I Gateway
Programmable Controllers
TIWA Y I Network
FDG
PCIU
DHP
“xyz”
Figure 1-1 TIWAY I Gateway as Inter face Between PLC Network and Host System
The Gateway
Interface
Distributed Contr ol
Systems

Product Overview 1-3 TIWAY I Gateway User Manual
1.2 Basic Operating Features
Two interface ports are located on the bottom of the TIW A Y I Gateway unit.
The AC power connections are also located on the bottom, covered by a
protective plate. (See Figure 1-2.)
• Host: an RS-232-C host interface port (25-pin female D-shell connector)
•TIWA Y I: the network port (9-pin female D-shell connector)
The host system is connected by cable to the host interface on the Gateway .
The communications cable is supplied with the Gateway . The TIW A Y I port
provides communication interface with the TIW A Y I network of PLCs or
other secondary devices.
Refer to Chapter 2 for information on TIW A Y I network installation.
Chapter 3 describes the procedures for installing and configuring the
TIWA Y I Gateway and the communications cables.
TIWAY I
port
I00xxxx
AC Power
Connections
Host
port
Status indicators
Figure 1-2 TIWAY I Gateway
Inter face Ports

Product Overview
1-4 TIWAY I Gateway User Manual
Basic Operating Features (continued)
The Gateway provides protocol and electrical interface conversion. A
command issued by the host system is transmitted to the Gateway . Once it
receives the command, the Gateway converts the protocol and electrical
signals and then relays the command to the PLC which was addressed.
After the PLC responds, the Gateway re-translates the information and
sends it back to the host system through the interface device.
The primary function of the Gateway , then, is to translate host commands
into TIW A Y I commands. These commands are described in Appendix C.
The TIW A Y I Gateway supports data transmission rates from 1 10 bits per
second (bps) to 19.2 kbps with the host, and from 1 10 bps to 1 15.2 kbps on
the network interface. T able 1-1 summarizes the baud rates supported by
the Foxboro, Honeywell, and Fisher host systems.
T able 1-1 Data T ransmission Rates Supported
Host System Data Transmission Rates Supported
110 150 300 600 1200 2400 4800 9600 19.2k
Foxboro       
Honeywell  
Fisher       
The Gateway allows access to discrete I/O points and Control Relays
(X, Y , and C), holding registers (V -memory), word input and output registers
(WX and WY), as well as performance statistics for each PLC network
interface. Information can be stored in variable (V) memory locations,
retrieved, and changed from the operator ’ s console of the distributed control
system. Appendix A provides information on the maximum numbers of
discrete inputs and outputs, holding registers, and word input registers.
Examples of data retrieval include the following:
• If you want to retrieve a process control loop integer value from a PLC,
move this value into a register , or V -memory location, corresponding to
the one configured in the distributed control system (refer to the
appropriate DCS manuals).
• If you want to look at the current value of a counter , move this value
into V -memory (using the ladder logic program) to a location configured
as a register in the host system.
Discrete inputs and outputs (Xs, Ys, and Cs) generally do not require special
conditioning in order to be read from the operator
’ s console (as in the Fisher
PROVOX system). See Appendix D for examples.
Translating
Commands
between Host and
PLC Network
Data T ransmission
Rates Supported
T ypes of Data
Accessed

Network Installation 2-1 TIWAY I Gateway User Manual
Chapter 2
Network Installation
2.1 TIWAY I Network and Gateway Installation Checklist 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Refer ence Installation Steps 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Installation Pr ocedures 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements for Installing the Gateway 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Network Media Installation — Local Line 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line Cable Characteristics 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TIWAY I Network Characteristics 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line Har dwar e Components 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tap Housing 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminating the Main Line Cable 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Twisted-Pair Cabling 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Important Planning Considerations 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Line T ap Spacing Rules 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Considerations 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Primary Rule 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Double Dr ops 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Dr ops 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multidrop Taps 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Routing 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Obstructions 2-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Noise A voidance 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Network Media Installation — RS-232-C Modem Inter face 2-12. . . . . . . . . . . . . . . . . . . . . . . . .
Data T ransmission Characteristics 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RS-232 Pin Assignments 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Network Installation
2-2 TIWAY I Gateway User Manual
2.1 TIWAY I Network and Gateway Installation Checklist
Figure 2-1 is a quick reference list of steps to be taken when installing the
TIWA Y I Gateway . Refer to Chapter 3 for specific procedures and cautions.
Attach AC power cable to the Gateway .
Run diagnostic tests.
Connect the network and host interface cables.
Configure the host system.
Configure the Gateway dipswitches.
Configure the variable memory of PLCs on the TIW A Y I network.
Check Gateway indicators for proper operation.
Figure 2-1 Basic Installation and Set-up Steps
Quick Refer ence
Installation Steps

Network Installation 2-3 TIWAY I Gateway User Manual
Some basic procedures to follow when installing a Gateway system include
the following.
• Be sure you have all components necessary to install the Gateway and
the network cables. (Refer to the checklist below for required parts.)
• Install the TIW A Y I network and host system interface cables (see
Section 2.2). Also refer to the appropriate host system installation
manuals for specific information on cabling between the host and the
Gateway.
• Install the Gateway in a NEMA panel or other suitable enclosure (see
Chapter 3 for more details).
The items below are required to install the TIW A Y I Gateway and to connect
it to a host system and the TIW A Y I network.
TIWA Y I Gateway
L-shaped mounting brackets and bracket screws, or optional rack
mount kit.
Host interface cable (included; PPX:2462553–0003)
Mounting screws (customer -supplied)
AC power cable (customer -supplied)
Loopback connector(s) for user -initiated diagnostic test (included;
PPX:2703834–0001)
TIWA Y I T ap Housing (for Local Line installation) (PPX:500–5606)
T ap cable for use with Local Line (customer -supplied), or
RS-232-C/423 cable for use with modems (both cables and modems are
customer-supplied)
Basic Installation
Procedures
Requir ements for
Installing the
Gateway

Network Installation
2-4 TIWAY I Gateway User Manual
2.2 Network Media Installation — Local Line
TIWAY I is a multi-drop communications network. It consists of a main
trunk cable (the “spine”) and dropline cables. The network can connect up to
248 secondaries to a host computer .
NOTE: Although addresses can range from 1 to 254 on TIW A Y I, addresses
248 through 254 cannot be used because of the limitations of the Modbus
protocol.
The selection of the media interface depends primarily upon two criteria:
the distance to be spanned and the cost of installation. The main trunk can
be up to 25,000 feet long, and each dropline can be up to 100 feet long, with
Local Line. For distances exceeding 25,000 feet, the use of RS-232-C media
interfaces and modems is required.
If cable redundancy is required (two TIW A Y I cables), you will need two
Gateways, two cables, and two host system interface devices. Refer to the
appropriate host system user manuals for more specific information on
redundant connections.
The TIW A Y I Local Line is a physical signalling technique (baseband,
differential current drive) which operates over shielded, twisted-pair
cabling. The Local Line cable may be up to 25,000 feet long. The Local Line
uses tap housings to simplify the addition of connections onto TIW A Y I.
The Local Line is designed to operate with shielded twisted-pair cable which
has a characteristic impedance of 124 ohms. The interface is a male, 9-pin
D-type connector with pin assignments as shown in T able 2-1.
T able 2-1 Pin Assignments for Local Line Connector
Pin Name Description
1
2
3
4
5
6
7
8
9
Shield
LLM+
LLM–
Reserved
Reserved
Cable shield and signal common
Reserved
Reserved
Positive biased signal line
Reserved
Reserved
Negative biased signal line
Overview
Local
Line Cable
Characteristics