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.

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

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

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