Failure and replacement of components during operation
16.3 Failure and replacement of components of the distributed I/Os
S7-400H
276 System Manual, 03/2012, A5E00267695-11
16.3 Failure and replacement of components of the distributed I/Os
Which components can be replaced?
The following components of the distributed I/Os can be replaced during operation:
● PROFIBUS DP master
● PROFIBUS DP interface module (IM 153-2 or IM 157)
● PROFIBUS DP slave
● PROFIBUS DP cable
Note
Replacing I/O and function modules located in a distributed station is described in section
Failure and replacement of an input/output or function module (Page 269).
16.3.1 Failure and replacement of a PROFIBUS DP master
Starting situation
Failure How does the system react?
The S7-400H is in redundant system mode and a
DP master module fails.
With single-channel one-sided I/O:
The DP master can no longer process
connected DP slaves.
With switched I/O:
DP slaves are addressed via the DP master
of the partner.
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