S7-400H Installation Options
2-5
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
2.2 I/O Modules for S7-400H
For the S7-400H you can use virtually any of the input/output modules featured in
the SIMATIC S7 system range. The I/O can be used in
• central controllers
• expansion units
• distributed over PROFIBUS DP.
The function modules (FMs) and communication processors (CPs) that can be
used in the S7-400H will be found in Appendix E.
I/O configuration versions
In addition to the power supplies and central processing units that are always used
as redundant modules, there are the following configuration versions for the
input/output modules:
• Single-channel, one-way configuration with normal availability
With the single-channel, one-way configuration single input/output modules are
present (single-channel). The input/output modules are located in just one of
the subsystems and are only addressed by that subsystem.
• Single-channel, switched configuration with enhanced availability
With the single-channel switched (distributed) configuration single input/output
modules are present (single-channel) but can be addressed by either
subsystem.
• Dual Channel Redundant Configuration with Fault Tolerance
There are double the number of I/O modules in a dual–channel redundant
configuration and these can be addresses by both subsystems.
Further information
You will find detailed information on the usage of I/O in Chapter 7.
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