Replacement Of A Power Supply Module - Siemens SIMATIC CPU 410 System Manual

Wiring synchronization modules crosswise
If you wire synchronization modules crosswise, i.e. the IF1 interface of the first CPU with
the IF2 interface of the second CPU and vice versa, the two CPUs take over the master
role and the system will now function properly. The LEDs IFM 1 and IFM 2 are lit on both
CPUs.
Make sure that you connect the IF1 interface of the first CPU with the IF1 interface of the
second CPU and the IF2 interface of the first CPU with the IF2 interface of the second CPU
when you replace the CPU. Mark the fiber-optic cables before the replacement, if
necessary.
13.1.2

Replacement of a power supply module

Starting situation
Both CPUs are in RUN.
Failure
The S7-400H is in redundant system mode and a
power supply module fails.
Procedure
Proceed as follows to replace a power supply module in the central rack:
Step
1
2
3
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
CAUTION
What to do?
Turn off the power supply (24 V DC for PS
405 or 120/230 V AC for PS 407).
Replace the module.
Switch the power supply module on again.
Replacement of failed components during redundant operation
13.1 Replacement of central components
How does the system react?
The partner CPU switches to single mode.
•
The partner CPU reports the event in the
•
diagnostic buffer and in OB 72.
How does the system react?
•
–
•
•
•
The entire subsystem is switched off
(system operates in single mode).
The CPU executes the self-tests.
The CPU performs an automatic LINK-
UP and UPDATE.
The CPU changes to RUN (redundant
system mode) and operates as reserve
CPU.
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