Fail-Safe Modules
7.6 EM 4 F-DI/3 F-DO DC24V PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
158
Installation and Operating Manual, 08/2008, A5E00103686-07
Causes of Faults and Corrective Measures
The following table contains the possible causes of the faults described for the individual
diagnostic messages of the EM 4 F-DI/3 F-DO DC24V PROFIsafe and remedies.
Table 7- 33 Diagnostic messages of the EM 4 F-DI/3 F-DO DC24V PROFIsafe, causes of errors and
remedies
Diagnostic
Message
Fault
detection
Possible Causes
Corrective Measures
Short circuit in the sensor/actuator Eliminate the short-circuit.
Cross-circuit at the sensor/actuator Eliminate the cross-circuit within
100 hours after the error has
occurred.
Encoder supply short circuit
Eliminate the short-circuit.
Short-circuit Depends
on
parameter
settings
Internal error
Replace module
Internal error Always
Internal module fault has occurred Replace module
Inserted module does not match
configuration
Faulty parameter assignment
Correct configuration (compare
actual and preset configuration)
Check communication paths
Correct configuration
Parameter
assignment
error
Always
PROFIsafe address set incorrectly
in the F-module
Check whether the PROFIsafe
address on the module matches
the configuration in
HW Config
Sensor
voltage or
load voltage
missing
Always
No supply voltage or supply
voltage is too low
Check the supply voltage on the
interconnected PM,
Check module for correct contact
Error in communication between F-
CPU and module due to defective
PROFIBUS connection or higher
than permissible EMI, for example
Check the PROFIBUS/PROFINET
connection
Eliminate the interference
PROFIsafe monitoring time set too
low
Set a greater value for the "F
monitoring time" parameter for the
module in
HW Config
Communicati
on error
Always
Configuration of the F-module
does not match safety program
Generate safety program again;
then load configuration and safety
program into F-CPU again
Faulty process signal
Defective sensor
Check process signal, replace
sensor if necessary
Short circuit between unconnected
sensor cable and the sensor
supply cable
Eliminate short circuit
Wire break in connected sensor
cable or the sensor supply cable
Eliminate broken wire
Assigned discrepancy time too
short
Check the assigned discrepancy
time
Safety-
related
shutdown
Always
Switching frequency exceeded
Reduce the switching frequency
Once the fault is eliminated, the F-
module must be reintegrated in the
safety program
Detailed information on F I/O access can be found under
"Diagnostics" in the S7 Distributed
Safety, Configuring and Programming manual or the S7 F/FH Systems, Configuring and
Programming manual.
