Siemens SIMATIC S7-400H System Manual page 257
Fault-tolerant systems
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Also See for SIMATIC S7-400H:
- System manual (376 pages) ,
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- Manual (10 pages)
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SIMATIC OPs, SIMATIC MPs
Do not install more than 4 OPs or 4 MPs in a fault-tolerant system. If you do need more
OPs/MPs, your automation task may have to be revised. Contact your SIMATIC sales
partner for support.
Do not select a screen refresh cycle time of less than 1 s, and increase it to 2 s as required.
Verify that all screen tags are requested within the same cycle time in order to form an
optimized group for read jobs.
OPC servers
When OPC is used to connect several HMI devices for your visualization tasks to a fault-
tolerant system, you should keep the number of OPC servers accessing the fault-tolerant
system as low as possible. OPC clients should address a shared OPC server, which then
fetches the data from the fault-tolerant system.
You can optimize data exchange by using WinCC and its client/server concept.
Various HMI devices of third-party vendors support the S7 communication protocol. You
should utilize this option.
S7-400H
System Manual, 03/2012, A5E00267695-11
14.8 General issues regarding communication
Communication
257
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