Failure and replacement of components during redundant operation
11.3 Failure and replacement of components of PROFINET IO
CPU 410-5H Process Automation
200
System Manual, 09/2014, A5E31622160-AB
11.3.2
Failure and replacement of PROFIBUS IO cables
Starting situation
Failure
How does the system react?
The S7-400H is in redundant system state and
the PROFINET IO cable is defective.
•
With one-sided I/O:
Rack failure OB (OB 86) is started (incoming
event). The IO controller can no longer ad-
dress connected IO devices
(station failure).
The LED BUS5F lF or BUS8F IF is flashing
•
With switched I/O:
I/O redundancy error OB (OB 70) is started
(incoming event). The IO devices are ad-
dressed via the IO controller of the partner.
The LED BUS5F lF or BUS8F IF and the LED
REDF are flashing.
Replacement procedure
Proceed as follows to replace PROFINET IO cables:
Step
What to do?
How does the system react?
1
Check the cabling and localize the
interrupted PROFINET IO cable.
–
2
Replace the defective cable.
The CPUs process the error OBs synchronized
with each other
•
With one-sided I/O:
Rack failure OB 86 (outgoing event)
The IO devices can be addressed via the IO
controller.
•
With switched I/O:
I/O redundancy error OB 70 (outgoing
event).
The IO devices can be addressed via both
IO controllers.
