Failure and Replacement of Components During Operation
10-13
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
10.2.1 Failure and Replacement of a PROFIBUS-DP Master
Initial situation
Failure How Does the System React?
The S7-400H is in redundant system mode
and one DP master module fails.
• With single-channel, one-way I/O:
DP master can no longer process
connected DP slaves.
• With switched I/O:
DP slaves are addressed via the DP
master of the partner.
Procedure
To replace a PROFIBUS-DP master, perform the following steps:
Step What Has To Be Done? How Does the System React?
1 Turn off the power supply of the central
rack.
The fault-tolerant system goes to
single mode.
2 Unplug the DP Profibus cable for the
affected DP master module.
-
3 Replace the affected module. -
4 Plug in the DP Profibus cable again. -
5 Turn on the power supply of the
central rack.
• CPU performs automatic LINK-UP
and UPDATE.
• CPU changes to RUN and
operates as the standby CPU.
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