Failure And Replacement Of A Redundant Profibus Dp Interface Module - Siemens SIMATIC S7-400H System Manual

Procedure
Proceed as follows to replace a PROFIBUS DP master:
Step
1
2
3
4
5
16.3.2

Failure and replacement of a redundant PROFIBUS DP interface module

Starting situation
Failure
The S7-400H is in redundant system mode and a
PROFIBUS DP interface module (IM 153–2, IM
157) fails.
Replacement procedure
Proceed as follows to replace the PROFIBUS DP interface module:
Step
1
2
3
4
S7-400H
System Manual, 03/2012, A5E00267695-11
16.3 Failure and replacement of components of the distributed I/Os
What has to be done?
Turn off the power supply of the central
rack.
Unplug the Profibus DP cable of the
affected DP master module.
Replace the module.
Plug the Profibus DP back in.
Turn on the power supply of the central
rack.
What has to be done?
Turn off the supply for the affected DP
interface module.
Remove the bus connector.
Insert the new PROFIBUS DP interface
module and turn the power supply back on.
Plug the bus connector back in.
Failure and replacement of components during operation
How does the system react?
The fault-tolerant system switches to single
mode.
–
–
–
The CPU performs an automatic LINK-

UP and UPDATE.
The CPU changes to RUN and operates

as the reserve CPU.
How does the system react?
Both CPUs report the event in the diagnostic
buffer and via OB 70.
How does the system react?
–
–
–
The CPUs process the I/O redundancy

error OB 70 (outgoing event)
synchronized with each other.
Redundant access to the station by the

system is now possible again.
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