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Fail-Safe Electronic Modules
8.2 4 /8 F-DI/4 F-DO DC24V/2A PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
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 Messages of the 4/8 F-DI/4 F-DO DC24V/2A PROFIsafe Electronic Module,
Causes of Faults and Corrective Actions
Diagnostic
Message
Fault
Detection
Possible Causes Corrective Actions
Short circuit in the actuator
Cross-circuit in the actuator 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.
Short circuit Always
Internal fault Replace module
Short circuit Cyclically
during short-
circuit test
Short circuit at the sensor
Cross circuit at the sensor Eliminate short circuit/cross circuit on
sensor
Overload For "1"
output signal
only
Output stage is overloaded
and becomes too hot
Eliminate overload.
Overtemperat
ure
Always Shutdown due to violation
of temperature limit values
in the module case.
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.
Open circuit For "1"
output signal
only
Open circuit Correct the wire break. Ensure
specified minimum load (see
"Technical
Specifications of the 4/8 F-DO/4 F-DO
DC24V/2A PROFIsafe Electronic
Module"
).
Fault 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 the configuration.
Parameter
assignment
error
Always
PROFIsafe address set
incorrectly on the F-module
Check whether the PROFIsafe address
on the module matches the
configuration in
STEP 7 HW Config
No supply voltage or
supply voltage is too low
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.
Sensor
voltage or
load voltage is
missing
Always
Voltage dip due to short
circuit
Eliminate short circuit/cross circuit.