4.4.2
Diagnostic messages of the digital modules
Overview
The table below gives an overview of the diagnostic messages for the digital modules with
diagnostics capability.
You can find out which diagnostic message each module is capable of in the Appendix entitled
"Diagnostic data of the signal modules".
Table 4-6
Diagnostic messages of the digital modules
Diagnostic message
LED
Scope of diagnostics
Programmable
Module error
INTF/EXTF
Module
No
Internal error
INTF
Module
No
External error
EXTF
Module
No
Channel error
INTF/EXTF
Module
No
External auxiliary voltage missing
EXTF
Module
No
Front connector missing
EXTF
Module
No
No module parameters
INTF
Module
No
Incorrect parameters
INTF
Module
No
Channel information available
INTF/EXTF
Module
No
STOP mode
-
Module
No
Internal voltage failure
INTF
Module
No
EPROM error
INTF
Module
No
Hardware interrupt lost
INTF
Module
No
Parameter assignment error
INTF
Channel
No
Short-circuit to M
EXTF
Channel
Yes
Short-circuit to L+
EXTF
Channel
Yes
Wire break
EXTF
Channel
Yes
Fuse blown
INTF
Channel
Yes
Sensor supply missing
EXTF
Channel/channel
group
Yes
Load voltage L+ missing
EXTF
Channel/channel
group
Yes
Note
Prerequisite for detecting errors indicated by programmable diagnostic messages is an
appropriate configuration of the digital module in STEP 7.
Digital modules
4.4 Diagnostics for digital modules
S7-400 Automation System Module Data
90
Reference Manual, Ausgabe 11/2016, A5E00850736-08