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