Siemens SIMATIC ET 200SP Manual page 49

Diagnostic message
Input signal could not be
clearly detected
Short circuit of internal sensor
supply to L+
Overload or short circuit of
internal sensor supply to
ground
Digital input module F-DI 8x24VDC HF (6ES7136-6BA00-0CA0)
Manual, 07/2013, A5E03858068-01
Fault
code
773 An error occurred in the plausibility check
D
of the input signal between the
processors.
You must eliminate the error within 100
hours. If you do not eliminate the error
within 100 hours, the F-module will
become inoperative.
Possible causes:
The input signal is faulty, e.g., as a
•
result of impermissibly high
electromagnetic interference.
A high-frequency input signal is
•
present, e.g., due to mutual
interference of sensors or the signal
being above the sampling frequency
of the input signal.
A momentary interruption/short circuit
•
of the sensor cable (loose contact) is
present.
The sensor/switch is bouncing.
•
774 Possible causes:
D
There is a short circuit of the internal
•
sensor supply with L+.
There is a short circuit of two sensor
•
supplies.
The capacitance of the connected
•
sensor for the configured test time is
too high.
The sensor is defective.
•
775 Possible causes:
D
The internal sensor supply is short-
•
circuited to ground.
Impermissibly high electromagnetic
•
interference is present.
Meaning
Interrupts/diagnostic messages
6.3 Diagnostic messages
Remedy
Use shielded cables to reduce the
•
EMC effects.
Reduce the input frequency.
•
Check the wiring of the sensor.
•
Eliminate the short circuit in the
•
process wiring.
Check the configured test time and
•
the process wiring.
Replace the sensor.
•
Eliminate the overload.
•
Eliminate the short circuit in the
•
process wiring.
Check the "Sensor supply"
•
parameter.
Eliminate/reduce the
•
electromagnetic interference.
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