Digital Modules
3-78
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Diagnostic Messages of the SM 322; DO 8 x 24 VDC/0.5 A
The following table provides an overview of the diagnostic messages of the
SM 322; DO 8 x 24 VDC/0.5 A.
Table 3-20 Diagnostic Messages of the SM 322; DO 8 x 24 VDC/0.5 A
Diagnostics Message
LED Scope of the
Diagnostics
Parameters can
be assigned
Wire-break SF Channel Yes
Load voltage missing SF Channel Yes
Short-circuit to M SF Channel Yes
Short-circuit to L+ SF Channel Yes
External auxiliary supply missing SF Module No
Internal auxiliary power missing SF Module No
Fuse blown SF Module No
Watchdog timeout SF Module No
EPROM error SF Module No
RAM error SF Module No
* Open-circuit detection is performed at a current < 1 mA.
When suitably parameterized, a wire-break results only in the
SF LED and the corresponding channel error LED lighting up.
Note
A prerequisite for detecting the errors indicated by programmable diagnostic
messages is that you have assigned parameters to the digital module accordingly
in STEP 7.
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