Fail-Safe Modules
7.7 4 F-DO DC24V/2A PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
173
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-DO DC24V/2A PROFIsafe and remedies.
Table 7- 37 Diagnostic messages of the EM 4 F-DO DC24V/2A PROFIsafe, causes of errors and
remedies
Diagnostic
Message
Fault
Detection
Possible Causes
Corrective Measures
Short circuit in the actuator Eliminate the short-circuit
Cross circuit in the actuator Eliminate the cross-circuit within 100
hours after the error has occurred.
Short circuit
Always
Internal error
Replace module
Overload
For "1"
output signal
only
Output stage is overloaded
and becomes too hot
Eliminate overload
Overtemperat
ure
Always
Shutdown due to violation
of upper or lower
temperature limit value in
the module case
Check load wiring, check ambient
temperature, check whether permissible
output current (total current) is
exceeded for the ambient temperature.
Once the fault has been eliminated, the
module must be removed and inserted
or the power switched off and on.
Wire break
For "1"
output signal
only
Line break
Eliminate broken wire, ensure specified
minimum load (see Technical
Specifications)
Internal error
Always
Internal module fault has
occurred
Replace module
Inserted module does not
match configuration.
Incorrect parameter
assignment.
Correct the 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 the module
for correct contact
Error in communication
between F-CPU and
module, e.g. due to
defective PROFIBUS
connection or higher than
permissible EMI
Test PROFIBUS/PROFINET
connection. Correct faults
PROFIsafe monitoring time
set too low
Set a greater value for the "F monitoring
time" parameter for the module in
HW Config
Communicatio
n 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
Safety-related
shutdown
Always
Switching frequency
exceeded
Reduce the switching frequency
