Functions of the IM 151/CPU
5-15
ET 200S Interface Module IM 151/CPU
A5E00058783-01
OBs for Error/Fault Responses
Table 5-11 OBs for Error/Fault Responses
Error/Fault
Invoked OB Possible Start Events
Time-out OB 80 Cycle time exceeded
Acknowledgment error during OB processing
Putting the clock forward (time jump) to start an OB
Program execution
error
OB 85 Start event for an OB not loaded
I/O access error during system updating of the process
image
Failure/reintegration
of the DP master or
a node in direct
communication
OB 86 Outgoing event (cause of event no longer exists)
Incoming event (cause of event still exists)
Programming error OB 121 An event occurring due to an error in program scanning, e.g.
due to the call of a block not loaded in the CPU
Error during direct
access to I/O
OB 122 Error during read access
Error during write access
If OBs 80, 85, 86, 121 are missing, or with OB 85 and the corresponding start
event, the IM 151/CPU goes into STOP.
Points to Note About OB 122
Note
Note the following about OB 122:
The CPU component enters the value ”0” in the following temporary variables of
the variable declaration table in the local data of the OB:
Byte no. 3: OB122_BLK_TYPE
(type of the block in which the error occurred)
Byte no. 8 and 9: OB122_BLK_NUM
(number of the block in which the error occurred)
Byte no. 10 and 11: OB122_PRG_ADDR
(address of the block in which the error occurred)
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