Siemens SIMATIC CPU 410 System Manual page 238

Replacement of failed components during redundant operation
13.3 Replacement of components of the distributed I/O on PROFIBUS DP
Replacement procedure
Proceed as follows to replace PROFIBUS DP cables:
Step
1
2
238
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 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC