You can find out which diagnostic messages are possible with which modules in the Appendix
entitled "Diagnostic Data of the Signal Modules".
Table 5-43
Diagnostic messages of the analog input 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
Measuring range module incorrect/missing
INTF
Module
No
Thermocouple connection error
EXTF
Module
No
STOP mode
-
Module
No
EPROM error
INTF
Module
No
RAM error
INTF
Module
No
ADC/DAC error
INTF
Module
No
Hardware interrupt lost
INTF
Module
No
Configuration / programming error
INTF
Channel
No
Short-circuit to M
EXTF
Channel
Yes
Wire break
EXTF
Channel
Yes
Reference channel error
EXTF
Channel
Yes
Underflow
EXTF
Channel
Yes
Overflow
EXTF
Channel
Yes
User connection not wired
EXTF
Channel
No
Open conductor in + direction
EXTF
Channel
No
Open conductor in - direction
EXTF
Channel
No
Run time calibration error
EXTF
Channel
No
Underrange or overrange
EXTF
Channel
No
Open conductor in the current source
EXTF
Channel
No
User calibration does not correspond to the param‐
eter assignment
EXTF
Channel
No
Note
A prerequisite for detecting the errors indicated by programmable diagnostic messages is that
you must have assigned parameters to the analog module accordingly in STEP 7.
Analog modules
5.17 Diagnostics functions of analog modules
S7-400 Automation System Module Data
224
Reference Manual, Ausgabe 11/2016, A5E00850736-08