Siemens C79000-Z7076-C552-01 user manual Configuring Software Redundancy, Profibus

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New Functions in Version V4.02

Configuring Software Redundancy

The configuration of a ªwarm standbyº system consists of:

Two S7 stations with one PROFIBUS-DP master interface each (each of these interfaces forms its own subnet).

One or more ET 200M devices with IM 153-3 which are connected to both subnets.

This configuration ensures that the ªstandby stationº takes over the processing of the user program if one station (one of the two DP masters fails) fails.

Two stations, each with one PROFIBUS-DP master interface

Station A

Station B

 

ET 200 M with IM 153-3

DP Master 1

DP Master 2

PROFIBUS

 

To set up this configuration with STEP 7, proceed as follows:

1.Configure the first station (station A) with all the ET 200M devices (IM 153-3).

2.Configure the second station (station B) without I/Os.

3.Copy the ET 200M in station A and paste these DP slaves in the DP master system of station B (menu command Edit  Redundant Paste); see also Page 4 (Improved Copy Function).

In contrast to the ªnormalº Paste function, ªRedundant Pasteº preserves the existing PROFIBUS and I/O addresses. Inconsistencies in addresses are thus avoided. You should follow step 3 very carefully; if the addresses overlap, this may cause the ªRedundant Pasteº to fail.

4.Complete the configuration of station B with central and distributed I/Os.

Important: The DP slaves with IM 153-3 must be configured in each of the two stations, which means they appear as two separate objects, although they are physically one and the same slave. If you change settings for one of the DP slaves, you must also copy this modified DP slave to the other station again to ensure consistency.

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Supplement to the STEP 7 User Manual V4.0

C79000-Z7076-C552-01

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Contents Copyright 1998 by Siemens AG C79000-Z7076-C552-01 New and Modified Functions in Version Additional Settings in the Simatic Manager New CPU Parameters Improved Copy FunctionWorking with DDB Files Switching to Network ConfigurationImproved Display and Print Functions Configuring the ET 200X BM 147/CPU as a DP Slave Configuring the DP/PA Link Configuring Software Redundancy ProfibusMore Convenient Way to Download Hardware Configurations Creating a Catalog ProfileConfiguring Connections while Configuring a Network Connecting an S7-200 to the Multipoint Interface No Distinction Between Upper and Lower Case CharactersEffects on Existing Programs New Functions in Version Operation Additional FunctionsPrinting Messages New Menu Command Filter and DisplayAssigning Value Ranges for Message Numbers Debugging in Program Status Procedure Debugging User ProgramsNew Functions Forcing with S7-300 Modules Archiving Projects with ªLongº File Names Support for Archive Program JAR 1.02 and Winzip Batch ModeNew Function Diagnosing Hardware ± Quick View Improved Print Functions in the Simatic Manager New Functions in Version