PLC concepts
5.1 Execution of the user program
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
101
Rack or station failure OB
The "Rack or station failure" OB executes when the CPU detects the failure or
communication loss of a distributed rack or station.
Rack or station failure event
The CPU generates a rack or station failure event when it detects one of the following:
● The failure of a DP master system or of a PROFINET IO system (in the case of either an
incoming or an outgoing event).
● The failure of a DP slave or of an IO device (in the case of either an incoming or an
outgoing event)
● Failure of some of the submodules of a PROFINET I-device
If you have not programmed this OB, the CPU remains in RUN mode when any of these
conditions occur.
Table 5- 9 Start information for rack or station failure OB
Event_Class Byte 16#32: Activation of a DP slave or an IO device
16#33: Deactivation of a DP slave or an IO device
16#38: outgoing event
16#39: incoming event
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