Replacement of failed components during redundant operation
13.1 Replacement of central components
CPU 410 Process Automation/CPU 410 SMART
226 System Manual, 05/2017, A5E31622160-AC
Note
Redundant power supply
If you use a redundant power supply with two PS 407 10A R or PS 405 10A R, two power
supply modules ar
e assigned to one fault-tolerant CPU. The associated CPU continues to
run if one of the redundant power supply modules fails. The defective part can be replaced
during operation.
Other power supply modules
If the failure concerns a power supply module outside the central rack (e.g. in the expansion
rack or in the I/O device), the failure is reported as a rack failure (central) or station failure
(remote). In this case, simply switch off the power supply to the power supply module
concerned.
Replacement of an input/output module or function module
Starting situation
How does the system react?
The CPU 410-5H is in redundant system mode
and an input/output or function module fails.
• Both CPUs report the event in the diagnostic
buffer and via appropriate OBs.
Note the different procedures.
Minor injury or damage to equipment is possible.
The procedure for replacing and input/output or function module differs for modules of the
S7-300 and S7-400.
Use the correct procedure when replacing a module. The correct procedure is described
below for the S7-300 in Chapter Replacement of components of the distributed I/O on
PROFIBUS DP (Page 233).
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