Programming the FM 352
7.8 Evaluating a diagnostics interrupt
FM 352 electronic cam controller
54 Operating Instructions, 05/2011, A5E01071724-03
7.8 Evaluating a diagnostics interrupt
Following a diagnostic interrupt, the diagnostic information is available in the variables of
OB 82 and can be used for a fast analysis. Call the CAM_DIAG block to find out the exact
cause of the error by reading the diagnostic buffer.
The local data of the diagnostic interrupt OB that are supported are listed below.
Variable Data type Description
OB82_MDL_DEFECT BOOL Module fault
OB82_INT_FAULT BOOL Internal fault
OB82_EXT_FAULT BOOL External fault
OB82_PNT_INFO BOOL Channel fault
OB82_EXT_VOLTAGE BOOL External auxiliary voltage missing
OB82_FLD_CONNCTR BOOL Front connector missing
OB82_WTCH_DOG_FLT BOOL Watchdog timeout
OB82_INT_PS_FLT BOOL Internal power supply of the module failed
OB82_HW_INTR_FLT BOOL Hardware interrupt lost
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