FetchWrite_PNCPU_b.pdf

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FETCH/WRITE service in an S7-300/400

CPU via the integrated Ethernet interface

Fetch/Write function block FB210/220

Application description y October 2009

Applikationen & Tools

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Fetch/Write function block FB210/220

V2.1, Beitrags-ID: 23592043

Foreword

Objective of the application

In today’s automation technology old systems are upgraded step by step from

SIMATIC S5 to SIMATIC S7. However, the interfaces for the data exchange on the

peer (for example, existing HMI systems) are to be kept. The FETCH/WRITE

service is still very frequently used for the communication via Industrial Ethernet.

The communication processors (CP343-1/CP443-1) of SIMATIC S7 support the

services FETCH and WRITE for data exchange on the following protocols:

• TCP

• ISO-on-TCP

• ISO transport

However, CPUs with integrated Industrial Ethernet interface are increasingly used

in S7-300 and S7-400 stations to connect these to the Industrial Ethernet network

and to exchange data with other nodes in the network. The FETCH/WRITE

services have not been implemented here.

This application shows how any FETCH/WRITE client can access the process data

via the integrated Industrial Ethernet interface of an CPU of the SIMATIC S7.

Main contents of this application

The following main points are discussed in this application:

• Implementing the FETCH and WRITE services in a SIMATIC S7 CPU with

integrated Industrial Ethernet interface for the open communication via

Industrial Ethernet with TCP and ISO-on-TCP protocol.

• Configuring the communication connections using the FETCH and WRITE

services for the SIMATIC NET OPC server in the PC station.

Delimitation

This application does not include a description of how the FETCH and WRITE

services are used with the SIMATIC S7 Industrial Ethernet CPs via S5-compatible

communication connections.

Basic knowledge of this topic is required.

Fetch/Write function block FB210/220

V2.1, Item-ID: 23592043

Foreword

Structure of the document

The documentation of this application is divided into the following main parts.

Part

Description

Application Description

You are provided with a general overview of the

contents. You are informed on the used components

(standard hardware and software components and the

specially created user software).

Principles of Operation and

Program Structures

This part describes the detailed functional sequences of

the involved hardware and software components, the

solution structures and – where useful – the specific

implementation of this application. It is only required to

read this part if you want to familiarize with the interaction

of the solution components to use these components e.g.

as a basis for own developments.

Structure, Configuration and

Operation of the Application

This part takes you step by step through structure,

important configuration steps, startup and operation of

the application.

Appendix

This part of the documentation includes further

information, e.g. bibliographic references, glossaries, etc.

Industry Automation und Drives Technologies Service & Support Portal

This entry is from the internet service portal of Siemens AG, Industry Automation

and Drives Technologies. Clicking the link below directly displays the download

page of this document.

http://support.automation.siemens.com/WW/view/en/<EntryID>

Fetch/Write function block FB210/220

V2.1, Beitrags-ID: 23592043

Table of Contents

Application Description... ............................................................................................ 7

1 Automation Task ... ............................................................................... 7

1.1 Overview ... ........................................................................................... 7

1.2 Description of the automation problem ... ............................................. 8

1.3 Requirements ... .................................................................................... 8

Requirements to the PC station .. ......................................................... 8

2 Automation Solution ... .......................................................................... 9

2.1 Overview of the overall solution ... ........................................................ 9

2.2 Automation solution.... ........................................................................ 10

2.3 Required hardware and software components .... .............................. 11

2.4 Performance Data .... .......................................................................... 12

2.5 Alternative solutions .... ....................................................................... 12

2.5.1 Hardware alternatives in the S7 station .... ......................................... 12

2.5.2 Hardware alternatives in the PC station.... ......................................... 13

2.5.3 Software alternatives.... ...................................................................... 13

Principles of Operation and Program Structures .... ............................................... 14

FETCH/WRITE communication services .... ....................................... 14

3.1

Principle of the communication services FETCH and WRITE .... ....... 14

3.2

Structure FETCH/WRITE Header telegram .... ................................... 16

3.2.1

Write job .... ......................................................................................... 16

Request telegram ... ............................................................................ 16

Response telegram ... ......................................................................... 16

3.2.2

FETCH job.... ...................................................................................... 18

Request telegram ... ............................................................................ 18

Response telegram ... ......................................................................... 18

3.2.3

Length of the Source / Destination data field .... ................................. 19

3.2.4

Start address .... .................................................................................. 20

3.2.5

Error number response telegram .... ................................................... 20

Structure and Flow of the S7 Program of the Application .... .............. 21

4.1

Overview of the S7 program structure .... ........................................... 21

4.2

Explanations of the S7 program structure of the application .... ......... 21

4.3

Execution of FB210 “FW_TCP”.... ...................................................... 23

Overview23

Description ... ...................................................................................... 23

Input and output parameters ... ........................................................... 26

4.4

Execution of FB220 “FW_IOT”.... ....................................................... 28

Overview28

Description ... ...................................................................................... 28

Input and output parameters ... ........................................................... 31

Explanation of the Configuration .... .................................................... 33

5.1

Programming the communication connections in the controller .... .... 33

5.1.1

Creating the connection parameters for the TCP connections .... ...... 34

Installing the Open Communication Wizard ... .................................... 34

Starting the Open Communication Wizard... ...................................... 34

Selecting the connection type ... ......................................................... 36

Configuring the communication partners ... ........................................ 36

Defining the properties of the communication partners ... .................. 37

Defining the ports of the TCP connections... ...................................... 38

Defining the name of the data structure ... .......................................... 39

5.1.2

Creating the connection parameters for the ISO-on-TCP

connections .... .................................................................................... 41

Installing the Open Communication Wizard ... .................................... 41

Fetch/Write function block FB210/220

V2.1, Item-ID: 23592043

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