Product overview
3.3 Functions
Interface module IM 155-5 MF HF (6ES7155-5MU00-0CN0)
30 Equipment Manual, 11/2023, A5E53268530-AA
3.3.3 System redundancy on S7-400H
Connection to H-CPUs with system redundancy
When system redundancy is used, you can connect the IM 155-5 MF HF (6ES7155-5MU00-
0CN0) interface module to CPUs 41x-5H PN/DP (version 6.0 or higher) of the S7-400.
These CPUs allow you to operate the interface module as a component of a redundant
system.
Requirements for the IM 155-5 MF HF interface module:
• With STEP 7 V5.5 SP3 and higher, the IM 155-5 MF HF is configured as a system
redundancy device.
• The connection setting (transmission medium/duplex) must be set to "Full duplex".
You can find examples for system redundancy in the Fault-tolerant systems S7-400H
(http://support.automation.siemens.com/WW/view/en/60458386) manual.
Combination of system redundancy and Shared Device
The IM 155-5 MF HF interface module can be connected to up to four IO controllers but only
to one H-CPU pair. As a result, a combination of system redundancy and Shared Device
operation is not possible when redundancy operation is used exclusively.
However, you can operate some of the I/O modules of the interface module in system
redundancy on the H-CPU pair and the other I/O modules with up to two additional IO
controllers in Shared Device operation.
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