Table of Contents
Advertisement
Causes and action
The following table shows all the diagnostic messages possible for expansion
modules, together with their causes and remedial action.
Table 5-13 Diagnostic messages – causes and remedial action
Diagnostic message
Configuration/parameter
assignment error
Wire break
Short-circuit to M
(error detection only when output
at "1")
Short-circuit to L+
Lower limit violation
Lower limit violation
Parameters
The parameters you can set and their ranges can be found in the technical data
applicable to expansion modules:
S for EM 142 DO 4
S for PM 148 DO 4
S for the expansion modules with analog inputs in Table 7-41
S for the expansion modules with analog outputs in Table 7-42
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Possible cause
You have assigned different
parameters to the module in the
user program (possible in
STEP 7 SFC call).
The new values are not within the
permissible range or are not
consistent.
Resistance of sensor/actuator
wiring too high
Interruption of the cable between
the module and the
sensor/actuator
Channel not wired (open)
S
Output overloaded
S
Output short-circuited to M
Output short-circuited to L+ of
module supply
Input value below underrange,
fault possibly caused by:
S
Sensor connected with
reverse polarity
S
Incorrect measuring range set Check connections
Input value higher than
overrange
DC 24V/2A (6ES7 142-1BD40-0XB0) in Table 7-28
DC 24V/2A in Table 7-37
Commissioning and Diagnostics
Remedial action
Assign new parameters to
module
Use a different sensor/actuator
type or wire differently – for
example, use wires having a
larger cross-section
Establish cable connection
Deactivate channel at AI
(by means of "measurement
type" parameter)
Wire up channel
S
Clear overloading
S
Clear short-circuit
Replace module
Assign parameters to other range
Assign parameters to other range
5-23
Advertisement
Table of Contents
