Siemens SIMATIC PCS 7 System Manual page 186

Failure and replacement of components during redundant operation
11.2 Failure and replacement of components of the distributed I/Os
Replacement procedure
Proceed as follows to replace PROFIBUS DP cables:
Step
1
2
186
What to do?
Check the cabling and localize the
interrupted PROFIBUS DP cable.
Replace the defective cable.
How does the system react?
–
The CPUs process the error OBs synchronized
with each other
With one-sided I/O:
•
Rack failure OB 86 (outgoing event)
The LED BUS1F goes out.
The DP slaves can be addressed via the
DP master system.
With switched I/O:
•
I/O redundancy error OB 70 (outgoing
event).
The DP slaves can be addressed via both
DP master systems.
The LED BUS1F and the LED REDF go
out.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB