Siemens Simatic S7-1500 Manual page 53

Diagnostic alarm
Module is defective
Watchdog tripped
Invalid/inconsistent firmware
present
Discrepancy failure, channel
state 0/0
Discrepancy failure, channel
state 0/1
Discrepancy failure, channel
state 1/0
Discrepancy failure, channel
state 1/1
Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA
Fault
code
256 Possible causes:
D
Impermissibly high electromagnetic
•
interference is present.
The F-module has detected an internal
•
error and has reacted in a safety-related
manner.
259 Possible causes:
D
Impermissibly high electromagnetic
•
interference is present.
The F-module has detected an internal
•
error and has reacted in a safety-related
manner.
283 The firmware is incomplete and/or firmware
D
added to the F-module is incompatible.
This leads to errors or functional limitations
when operating the F-module.
768 Possible causes:
D
The process signal is faulty.
•
769
D
The sensor is defective.
•
The configured discrepancy time is too
•
770
D
low.
There is a short-circuit between an
•
771
D
unconnected sensor cable and the sen-
sor supply cable.
Wire break in connected sensor cable
•
or the sensor supply cable
An error occurred during the discrepan-
•
cy check.
Meaning
Interrupts/diagnostic messages
6.3 Diagnostic alarms
Remedy
Eliminate the interference. The
•
module must then be pulled and
plugged, or the power switched
OFF and ON.
If the F-module cannot be put
•
back into operation, consider re-
placing it.
Eliminate the interference. The
•
module must then be pulled and
plugged, or the power switched
OFF and ON.
If the F-module cannot be put
•
back into operation, consider re-
placing it.
Perform a firmware update for all
•
parts of the F-module and note
any error messages.
Use only firmware versions re-
•
leased for this F-module.
Check the process signal.
•
Replace the sensor.
•
Check the parameter assignment
•
of the discrepancy time.
Check the process wiring.
•
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