Siemens SIMATIC S7-400H System Manual page 108

PROFINET
8.8 System redundancy
Commissioning a system-redundant configuration
It is imperative that you assign unique names during commissioning.
Proceed as follows when you change or reload a project:
1. Set the fault-tolerant system to STOP on both sides.
2. Reset the standby CPU memory.
3. Download the new project to the master CPU.
4. Start the fault-tolerant system.
Note
Using the topology editor
Use the topology editor in HW Config.
Maximum number of IO devices
You can connect up to 256 IO devices to both integrated PROFINET interfaces. These can
be configured for one-sided or redundant mode. The station numbers must be unique for
both PROFINET interfaces and between 1 and 256.
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System Manual, 03/2012, A5E00267695-11
S7-400H