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

13.3.2

Failure and replacement of a redundant PROFIBUS-DP interface module

Starting situation
Failure
The S7-400H is in redundant mode and a
PROFIBUS-DP interface module (IM 153–2, IM 157)
fails.
Replacement procedure
To replace the PROFIBUS-DP interface module:
Step
1
2
3
4
13.3.3

Failure and replacement of a PROFIBUS-DP slave

Starting situation
Failure
The S7-400H is in redundant mode and a DP slave
fails.
Procedure
To replace a DP slave:
Step
1
2
3
4
S7-400H
System Manual, 09/2007, A5E00267695-03
13.3 Failure and replacement of components of the distributed I/Os
What has to be done?
Turn off the supply for the affected DP
interface module.
Unplug the connected bus connector.
Insert the new PROFIBUS-DP interface
module and turn the supply back on.
Plug the bus connector back in.
What has to be done?
Turn off the supply for the DP slave.
Unplug the connected bus connector.
Replace the DP slave.
Plug the bus connector in and turn the
supply back on.
Failure and replacement of components during operation
How does the system react?
Both CPUs report the event in the diagnostics
buffer and via OB 70.
How does the system react?
–
–
–
CPUs process the rack failure OB 70 in
•
synchronism (outgoing event).
Redundant access to the station is again
•
possible for the system.
How does the system react?
Both CPUs report the event in the diagnostics
buffer and via the appropriate OB.
How does the system react?
–
–
–
CPUs process the rack failure OB 86 in
•
synchronism (outgoing event)
DP slave can be addressed by the relevant
•
DP master system.
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