Evaluating A Diagnostics Interrupt - Siemens S7-300 Operating Instructions Manual

Programming the FM 352

7.8 Evaluating a diagnostics interrupt

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.
OB82_MDL_DEFECT
OB82_INT_FAULT
OB82_EXT_FAULT
OB82_PNT_INFO
OB82_EXT_VOLTAGE
OB82_FLD_CONNCTR
OB82_WTCH_DOG_FLT
OB82_INT_PS_FLT
OB82_HW_INTR_FLT
54
Variable Data type
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
BOOL
Description
Module fault
Internal fault
External fault
Channel fault
External auxiliary voltage missing
Front connector missing
Watchdog timeout
Internal power supply of the module failed
Hardware interrupt lost
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03