Siemens SIMATIC PCS 7 CPU 410-5H

Failure and replacement of components during redundant operation
11.3 Failure and replacement of components of PROFINET IO
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
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11.3
Failure and replacement of components of PROFINET IO
11.3.1
Failure and replacement of a PROFINET IO device
Starting situation
Failure
How does the system react?
The S7-400H is in redundant system state and an
IO device fails.
Both CPUs signal the event in the diagnostics
buffer and via a corresponding OB.
Procedure
Proceed as follows to replace an IO device:
Step
What to do?
How does the system react?
1 Switch off the power supply for the IO de-
vice.
OB 86 and OB85 are called, the LED REDF
lights up, the corresponding LED BUSxF
flashes.
2
Remove the bus connector.
–
3
Replace the IO device.
–
4 Plug the bus connector back in and turn the
power supply back on.
• The CPUs process the rack failure OB
86 synchronously (outgoing event).
• The IO device can be addressed by the
respective IO system.