Fail-Safe Electronic Modules
8.3 F -Switch PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
135
Diagnostic
Message
Fault
Detection
Possible Causes
Corrective Actions
Error in communication
between the F-CPU and
module, e.g., due to
defective
PROFIBUS/Industrial
Ethernet connection or
higher than permissible
electromagnetic
interferences
Test PROFIBUS/Industrial Ethernet
connection. Eliminate the interferences.
PROFIsafe monitoring time
set too low
Reduce the call interval for F-program,
or
Set a higher value for the "F-monitoring
time" parameter for the module in
STEP 7 HW Config
Communicatio
n error
Always
Configuration of the F-
module does not match the
safety program
Recompile the safety program; then
reload the configuration and safety
program to the F-CPU
Process signal is faulty
Sensor is defective
Check process signal. Replace sensor
if necessary.
Short circuit between
unconnected sensor cable
(open switch) and the
sensor supply cable
Eliminate short circuit
Wire break in connected
sensor cable (closed
switch) or sensor supply
cable
Eliminate broken wire
Assigned discrepancy time
is too short
Check the assigned discrepancy time.
Once the error is eliminated, the F-
module must be reintegrated in the
safety program.
Safety-related
shutdown
Always
Switching frequency
exceeded
Reduce the switching frequency
Generally Applicable Information on Diagnostics
For information on diagnostics pertaining to all fail-safe modules (e.g., for reading out
diagnostic functions, passivating channels), refer to
"Diagnostics".
