Failure and replacement of components during redundant operation
11.2 Failure and replacement of components of the distributed I/Os
CPU 410-5H Process Automation
194 System Manual, 09/2014, A5E31622160-AB
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
● Input/output or function modules in a distributed station
Replacement of signal and function modules
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 S7-400 in Chapter Failure and replacement of an input/output or function
module (Page 188).
To replace signal and function modules of an S7-300, perform the following steps:
How does the system react?
Disconnect the module from its load current supply.
2 Remove the failed module (in RUN mode).
• Both CPUs generate a remove/insert
interrupt and enter the event in the diagnostic
buffer and the system status list.
Disconnect the front connector and wiring.
4 Plug the front connector into the new module. -
5 Insert the new module.
• Both CPUs generate a remove/insert
interrupt and enter the event in the diagnostic
buffer and the system status list.
• Parameters are assigned automatically to the
module by the CPU concerned and the module is
addressed again.
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