11
11-3
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
11.2 Diagnostic Interrupts
Errors leading to a diagnostic interrupt are monitored for their “incoming”
and “outgoing”.
The FM 351 signals “incoming” errors by:
Lighting the LED “SF” (see Fig. 11-1).
Maybe also lighting the LEDs “CH1” or “CH2”.
Setting the Bit 0.0 in OB 82 (OB82_MDL_DEFECT).
Note
A diagnostic interrupt is “incoming” if at least one error is present. If an er-
ror, but not all errors have been rectified, the rest of the existing errors are
signaled again as “incoming”.
A diagnostic interrupt is then only “outgoing” if the last error on the module
has been rectified.
A requirement for the evaluation of the cause of a diagnostic interrupt is that
you have linked the interrupt OB (OB 82; see Programming Manual System
Software for S7-300 and S7-400, Program Design) in your user program.
The diagnostic interrupts must be enabled in the basic parameterization.
Note
If the OB 82 is not linked, the CPU enters the STOP state for a diagnostic
interrupt.
Purpose
Requirements
Error Handling
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