Siemens NCM S7 User Manual

Communication via Ethernet CPs in S7 Stations
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SIMATIC NET NCM S7 for Industrial Ethernet
C79000-G8976-C129–06
1.6 FETCH/WRITE Services (Server)
Application
In addition to the SEND/RECEIVE interface, the FETCH/WRITE functionality
provides further services for S5-compatible communication on configured transport
connections.
The FETCH/WRITE interface is used primarily to attach SIMATIC S7 to SIMATIC
S5 and to other non-S7 stations (for example PCs).
S FETCH
The partner on the connection (SIMATIC S5 or non-S7 station) can read
system data on the SIMATIC S7 PLC.
S WRITE
The partner on the connection (SIMATIC S5 or non-S7 station) can write
system data on the SIMATIC S7 PLC.
From the point of view of the SIMATIC S7 PLC, this is a passive communication
function; the communications partner initiates the connection establishment.
For further information, refer to the system documentation of the SIMATIC S5 PLC
or the non-S7 station you are using.
Connection Types
To access a station with FETCH or WRITE functions, a FETCH passive or WRITE
passive connection must be configured. The following types are possible:
S ISO Transport
S ISO-on-TCP
S TCP
Coordinating Access Using the User Program
To coordinate access, you can use the FCs AG_LOCK and AG_UNLOCK.
With these FCs, you can coordinate access to system memory areas so that no
inconsistent data are created and transferred.
SIMATIC S5
On the SIMATIC S5 station, the FETCH/WRITE services are configured and
started by READ ACTIVE/PASSIVE and WRITE ACTIVE/PASSIVE.

Siemens NCM S7 Specifications

General

Brand	Siemens
Model	NCM S7
Category	Switch
Language	English

Summary

Communication via Ethernet CPs in S7 Stations

Industrial Ethernet

Defines Industrial Ethernet and its role in the SIMATIC NET concept.

SIMATIC S7 Communication with S7 Ethernet CPs

Details the types of communication supported by S7 Ethernet CPs.

S5-compatible Communication (SEND/RECEIVE Interface)

Explains using the SEND/RECEIVE interface for S5-compatible communication.

Networking Stations with STEP 7

Installing and Starting the Ethernet CP with STEP 7

Procedure

Entering an Ethernet CP in the Hardware Configuration

Details how to add an Ethernet CP to the hardware configuration.

Configuring Communication Services

Explains how to set up various communication services and connections.

SEND/RECEIVE Interface in the User Program

How the SEND/RECEIVE Interface Works on the CPU

Illustrates the interaction between CPU and Ethernet CP using SEND/RECEIVE FCs.

Programming the SEND/RECEIVE Interface

Guides on programming SEND/RECEIVE interface using FCs and evaluating status.

Configuring Communication Connections

Connections

Creating a New Connection

Explains the process of setting up new communication connections in NetPro.

Configuring ISO Transport Connections

Configuring ISO-on-TCP Connections Properties

Configuring TCP Connection Properties

Configuring UDP Connection Properties

Programming FCs (Functions) and FBs for S7 Ethernet CPs

Setting Parameters for FC Calls

FCs for Configured Connections

Details specific FCs for data transfer over configured connections.

FCs for Access Coordination with FETCH/WRITE

NCM S7 Diagnostics

Functions of NCM S7 Diagnostics

Installing and Starting NCM S7 Diagnostics

How to Use Diagnostics

Provides a recommended procedure for using the diagnostic tool efficiently.

Checklist for ‘Typical Problems‘ in a System

Firmware Loader

Loading Firmware

Linking to Other Systems with FETCH/WRITE

Structure of WRITE Frames

Structure of FETCH Frames