Siemens SIMATIC Operating Instructions Manual page 101

Causes of Faults and Corrective Actions
The following table presents the possible causes of faults and corrective actions for the
individual diagnostic messages of the 4/8 F-DI/4 F-DO DC24V/2A PROFIsafe electronic
module.
Table 8-19
Diagnostic
Message
Short circuit
Short circuit
Overload
Overtemperat
ure
Open circuit
Fault
Parameter
assignment
error
Sensor
voltage or
load voltage is
missing
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
8.2 4 /8 F-DI/4 F-DO DC24V/2A PROFIsafe Digital Electronic Module
Diagnostic Messages of the 4/8 F-DI/4 F-DO DC24V/2A PROFIsafe Electronic Module,
Causes of Faults and Corrective Actions
Fault Possible Causes
Detection
Always Short circuit in the actuator
Cross-circuit in the actuator
Internal fault
Cyclically Short circuit at the sensor
during short-
Cross circuit at the sensor
circuit test
For "1" Output stage is overloaded
output signal and becomes too hot
only
Always Shutdown due to violation
of temperature limit values
in the module case.
For "1" Open circuit
output signal
only
Always Internal module fault has
occurred
Always Inserted module does not
match configuration;
incorrect parameter
assignment
PROFIsafe address set
incorrectly on the F-module
Always No supply voltage or
supply voltage is too low
Voltage dip due to short
circuit
Fail-Safe Electronic Modules
Corrective Actions
Eliminate short circuit/cross circuit on
actuator
Once the fault has been eliminated, the
module must be removed and inserted,
or the power switched off and on.
Replace module
Eliminate short circuit/cross circuit on
sensor
Eliminate overload.
Check load wiring. Check ambient
temperature. Check whether
permissible output current (aggregate
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.
Correct the wire break. Ensure
specified minimum load (see
Specifications of the 4/8 F-DO/4 F-DO
DC24V/2A PROFIsafe Electronic
Module"
).
Replace module
Correct the configuration (compare
actual and preset configuration). Check
communication paths.
Correct the configuration.
Check whether the PROFIsafe address
on the module matches the
STEP 7 HW Config
configuration in
Check module for proper contact.
Once the fault has been eliminated, the
module must be removed and inserted,
or the power switched off and on.
Eliminate short circuit/cross circuit.
"Technical
101