Siemens SIMATIC S7 User manual

SIMATIC
S7 - OPEN MODBUS / TCP
Communication via CP343-1 and CP443-1
Manual

SIMATIC S7
OPEN MODBUS / TCP
Communication via
CP343-1 and 443-1
Manual
Edition 4.3
Preface, Table of Contents
Product Description 1
Getting Started 2
Commissioning 3
Licensing 4
FB MODBUSCP 5
Diagnostics 6
Application Samples 7
Appendices
Literature
Glossary

Safety Precautions and
Warnings
This manual contains warnings, which you should note for your own safety as well as for
the prevention of damage to property. These warnings are indicated by means of a triangle
and displayed as follows in accordance with the level of danger:
__________________________________________________________________
Danger
indicates that loss of life, severe personal injury or substantial damage
will result if proper precautions are not taken.
__________________________________________________________________
__________________________________________________________________
Warning
indicates that loss of life, severe personal injury or substantial damage can result if proper
precautions are not taken.
__________________________________________________________________
__________________________________________________________________
Caution
indicates that minor personal injury or property damage can result if proper precautions are
not taken.
__________________________________________________________________
__________________________________________________________________
Note
call attention to information that is especially significant to the product, handling of the
product or a specific part of this documentation.
__________________________________________________________________
Qualified
Personnel The equipment may be commissioned and put into operation by qualified personnel only.
For the purpose of safety relevant warnings of this manual a qualified person is one who is
authorized to commission, ground and tag devices, systems and circuits.
Use as prescribed
Trademarks
Please note the following:
___________________________________________________________________
Warning
This equipment must only be used in applications as prescribed in the catalogue and the
technical description and in conjunction with equipment and components recommended and
authorized by Siemens.
Successful and safe operation of this equipment is dependent upon proper transport, and
storage, erection and installation as well as careful operation and maintenance.
SIMATIC®and SIMATIC NET®are registered trademarks of SIEMENS AG.
The other brand names in this manual may be trademarks use of which by third parties for
their purposes may infringe the proprietors’ rights.
Copyright ©Siemens AG 2004-2009 All Rights Reserved
The reproduction, transmission or use of this document or its contents
is not permitted without express written authority. Offenders will be
liable for damages. All rights, including rights created by patent grant
or registration of a utility model or design, are reserved.
Siemens AG
Industry Sector
Engineering and Construction
I IS IN E&C
P.O. Box 3240, D- 91050 Erlangen
[email protected]
Exclusion from Liability
We have checked the contents of this document with regard to
conformity to the described hardware and software. Deviations,
however, cannot be excluded; therefore we cannot accept prejudice
for its complete conformity. The information in this document is
checked regularly and necessary corrections are contained in
subsequent issues. Any suggestions for improvement are gratefully
received.
We reserve the right to make technical changes.

Preface
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3 1
Preface
Purpose of the
Manual The information in this manual allows you to set up and put in operation the
connection between the CP 343-1/CP 443-1 and a device that supports the
Open MODBUS/TCP protocol.
Contents of the
Manual This manual describes the function of the function block MODBUSCP and
its integration into the hardware and software of the communication
processors CP 343-1/CP 443-1.
The manual contains the following topics:
•Production description / Mounting
•Getting Started
•Commissioning
•Parameterization
•Licensing
•Function block MODBUSCP
•Diagnostics
•Application samples
Scope of this
Manual This manual is valid for the following software:
Product Identification number From version
OPEN MODBUS / TCP 2XV9 450-1MB00 4.3
FB 108 “MODBUSCP” 1.3 / 2.2
FB 106 “MB_CPCLI” 1.2 / 2.2
FB 107 “MB_CPSRV” 1.2 / 2.1
Note
This manual contains the FB description, as it is valid at the time of
publication.
How to Access the
Information in this
Manual
To enable you a quick access to selected information, the manual provides
the following access aids:
•The next pages contain a complete table of contents.

Preface
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3 2
Additional
Sources of
Information
All additional information concerning CP 343/CP 443 (mounting,
commissioning etc.) can be found in the manual
SIEMENS
SIMATIC NET
S7-CPs for Industrial Ethernet
device manual C79000-G8900-C155
SIEMENS
SIMATIC NET
S7-CPs for Industrial Ethernet
device manual part B1
CP 343-1 / CP 343-1EX20
C79000-G8900-C158
SIEMENS
SIMATIC NET
S7-CPs for Industrial Ethernet
device manual part B4
CP 443-1
C79000-G8900-C152
SIEMENS
SIMATIC NET
NCM S7 for Industrial Ethernet
manual C79000-G8900-C129
Additional information concerning STEP7 can be found in the following
manuals:
SIEMENS
SIMATIC Software
Base software for S7 and M7
STEP7 user manual
C79000-G7000-C502-..
SIEMENS
SIMATIC Software
System software for S7-300/400
System and standard functions
Reference manual C79000-G7000-C503-02
Additional
Questions If you have further questions regarding the use of the FBs described in this
manual, which are not answered in this document, please contact your
Siemens partner who supplied you with this function block.
Terminology This document uses the term CP or CP 343/CP 443. The descriptions only
apply to communications processor CP 343-1/CP 443-1.
Scope of
Application The function block described in this manual establishes a connection
between the CP 343-1/CP 443-1 and third party MODBUS devices.

Table of contents
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
ii
Table of Contents
1...... Product Description.......................................................................................................1-1
1.1........ Field of Applications..........................................................................................1-1
1.2........ Hardware and Software Prerequisites..............................................................1-2
2...... Getting Started...............................................................................................................2-1
3...... Commissioning ..............................................................................................................3-1
3.1........ Installing the Library on the STEP7 PG/-PC ....................................................3-1
3.2........ Parameterization of the CP ..............................................................................3-2
3.3........ Network Configuration......................................................................................3-4
3.4........ How to Select the Appropriate Modbus Block..................................................3-9
3.5........ Insertion of the Function Blocks into the Program..........................................3-10
3.6........ Multiple Connections via Port 502..................................................................3-12
3.7........ Start_up Characteristics of CP343 / CP443...................................................3-13
3.8........ Changeover of a Previous Version to V4.x ....................................................3-14
4...... Licensing ........................................................................................................................4-1
5...... Function Block MODBUSCP.........................................................................................5-1
5.1........ Functionality of the FB......................................................................................5-1
5.2........ Parameters of the Function Block MODBUSCP ..............................................5-4
5.3........ Address Mapping............................................................................................5-12
5.4........ Data and Standard Functions used by the FB ...............................................5-15
5.5........ Renaming of Standard Functions...................................................................5-17
6...... Diagnostics.....................................................................................................................6-1
6.1........ Diagnostics via the Display Elements of the CP ..............................................6-1
6.2........ Diagnostic Messages of the FB MODBUSCP..................................................6-2
6.3........ Diagnostic Messages of FC5/FC6 and FC50/FC60.........................................6-8
6.4........ Diagnostic Messages of included FCs/SFCs...................................................6-8
6.5........ Diagnostic Messages of SFC24.......................................................................6-8
7...... Application Samples......................................................................................................7-1

Table of contents
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
iii
7.1........ Sample project STL..........................................................................................7-2
7.2........ Sample project CFC .........................................................................................7-3

Product description
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
1-1
1 Product Description
1.1 Field of Applications
Placement in the
System Environ-
ment
The driver described here is a software product for the Communications
Processor CP343-1/CP443-1.
The CP343-1 can be used in the SIMATIC S7-300 automation system and
can establish communication links to partner systems.
CP443-1 can be used in the SIMATIC S7-400 automation systems and can
establish communication links to partner systems.
Function of the
FBs These function blocks enable a communication link between CP343-1 /
CP443-1 and a device that supports the Open MODBUS/TCP protocol. The
function codes 1, 2, 3, 4, 5, 6, 15 and 16 are provided.
Data transmission is carried out following the Client-Server principle.
The SIMATIC S7 can act as both client and server during the data
transmission.
TCP/IP with
CP343-1 / CP443-1 TCP/IP with CP343-1 and CP434-1 uses static connections. The TCP
connection is not disconnected during errror-free operation.
Network configuration of STEP7 enables only a unique use of a specific
port number,when using TCP native stack of the CP.
However, with specific CP modules it is possible to use multiple connection
via port 502 to different clients simultaneously.
In section 3.6 “Mulitple connections via port 502” you can find technical details
regarding this matter.

Product description
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
1-2
1.2 Hardware and Software Prerequisites
Usable Modules You can find the latest hardware prerequisites on the internet:
www.siemens.com/s7modbus.
Software Versions The usage of the modbus blocks is possible with STEP7 Version 5.4 or
higher. Withal the use of the blocks AG_LSEND/AG_LRECV V3.1 of the
update of SIMATIC NET library
(http://support.automation.siemens.com/WW/view/en/22172239) is required.
Memory
requirements The FB MODBUSCP requires ca. 6k byte work and load memory.
The FB MB_CPCLI requires ca.10k byte work and memory.
The FB MB_CPSRV requires ca. 10 k byte work and load memory.
The particular length of the blocks can be determined in the properties of the
block in the Simatic Manager.

Getting started
OPEN MODBUS / TCP communication via CP343-1 and 443-1
2XV9450-1MB00; Manual edition 4.3
2-1
2 Getting Started
Procedure 1. Install “OpenModbusTCP CP“.
=> Section 3.1
2. Parameterize the connection parameters regarding your requirements
(IP-address, port number, etc.).
=> Section 3.2 to 3.4
3. Insert the Modbus function blocks into your SIMATIC project.
=> Section 3.6
4. Call the Modbus block FB108 in the required OBs.
=> Section 5.1
5. Parameterize the Modbus block for initialization (client/server, DB areas,
Modbus addresses) and runtime.
=> Section 5.2
6. Load the user program into the PLC and license the Modbus block for this
CPU.
=> Section 4