Siemens SIMATIC ET 200X - Diagnostic Messages for Modules with AI; Diagnostic Messages for Modules with AO

Commissioning and Diagnostics
5-21
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Diagnostic messages of expansion modules with analog inputs
When a fault is detected, modules with analog inputs supply a signal value of
”7FFF
H
”, irrespective of parameter assignment.
Table 5-11 Diagnostic messages for modules with AI
Diagnostic message
Area affected by
diagnostics
Configurable
Configuration or parameter assignment error Expansion module Not configurable
Wire break (only with current inputs and over
the measuring ranges 4 to 20 mA)
1
Channel Configurable
Upper limit violation Channel Parameterizable
2
Lower limit violation Channel Parameterizable
2
1
The broken wire signal is triggered at a current value of  3.6 mA.
2
Perform the setting by activating the ”group diagnosis” parameter in the configuration
software.
Diagnostic messages of expansion modules with analog outputs
Table 5-12 Diagnostic messages for modules with AO
Diagnostic message
Area affected by
diagnostics
Configurable
Configuration or parameter
assignment error
Expansion module Not configurable
Wire break (with current
outputs only)
1
Channel Parameterizable
2
Short-circuit to M (with
voltage outputs only)
3
Channel Parameterizable
2
1
In the case of EM 145 AO 2  I (6ES7 145-1GB31-0XB0) the broken wire signal is
triggered at a current value of  –2 mA or  +2 mA.
2
Perform the setting by activating the ”group diagnosis” parameter in the configuration
software.
3
In the case of EM-circuit signal is triggered at a voltage value of  –750 mV or  +750 mV.