Replacement of failed components during redundant operation
13.1 Replacement of central components
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
227
To replace signal and function modules of an S7-400, perform the following steps:
How does the system react?
1 Disconnect the module from its peripheral
power supply, if necessary.
2 Disconnect the front connector and wiring.
• If the affected module can generate
diagnostic interrupts and if diagnostic in-
terrupts are enabled as per configura-
tion, a diagnostic interrupt is generated.
• Call OB 122 if you are accessing the
module by direct access
• Call OB 85 if you are accessing the
module using the process image
3 Remove the failed module (in RUN mode).
• Both CPUs generate a remove/insert
interrupt and enter the event in the di-
agnostic buffer and the system status
list.
4 Insert the new module.
• Both CPUs generate a remove/insert
interrupt and enter the event in the di-
agnostic buffer and the system status
list.
• Parameters are assigned automatically
to the module by the CPU concerned
and the module is addressed again.
5 Plug the front connector into the new mod-
ule.
• If the affected module can generate
diagnostic interrupts and if diagnostic in-
terrupts are enabled as per configura-
tion, a diagnostic interrupt is generated.
Replacement of a communication module
This section describes the failure and replacement of communication modules for
PROFIBUS and Industrial Ethernet.
The failure and replacement of communication modules for PROFIBUS DP is detailed in
Replacement of a PROFIBUS DP master (Page 234).
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