Siemens CPU 410-5H Process Automation - Failure and Replacement of PROFIBUS DP Cables

Failure and replacement of components during redundant operation
11.2 Failure and replacement of components of the distributed I/Os
CPU 410-5H Process Automation/CPU 410 SMART
178 System Manual, 10/2013, A5E32631667-AA
Step
What has to be done?
How does the system react?
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 DP master system.
11.2.4
Failure and replacement of PROFIBUS DP cables
Starting situation
Failure
How does the system react?
The S7-400H is in redundant system mode and
the PROFIBUS DP cable is defective.
• With single-channel one-sided I/O:
Rack failure OB (OB 86) is started (incoming
event). The DP master can no longer process
connected DP slaves
(station failure).
• With switched I/O:
I/O redundancy error OB (OB 70) is started
(incoming event). DP slaves are addressed
via the DP master of the partner.
Replacement procedure
Proceed as follows to replace PROFIBUS DP cables:
Step
What has to be done?
How does the system react?
1 Check the cabling and localize the
interrupted PROFIBUS DP cable.
–
2
Replace the defective cable.
–
3 Switch the failed modules to RUN
mode.
The CPUs process the error OBs synchronized
with each other
• With one-sided I/O:
Rack failure OB 86 (outgoing event)
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.