Input Check - Toshiba V200 Series User Manual

8.1.4 Input Check

If the program is running but the external input signal is not read normally, check the following points:
Is the input status
changed ON/OFF
to the corresponding
device operation
Connect the programming
tool, and monitor the
corresponding X device state
in RUN mode
Not normal
Check whether the X device
is forced or not
Not forced
Check whether the
allocation table is identical
the actual I/O
Not
Execute the automatic I/O
allocation, and check whether
the I/O allocation table is now
identical to the actual I/O
configuration
No
Check the expansion unit
Hardware one by one
the expansion rack ?
If not, check the input voltage at the
V200's input terminals.
If the voltage is not normal, check the input
device and the cable.
If the voltage is normal, the V200's
input circuit may be faulty.
If the monitored X device state is identical
to the state of the input status LED, the
cause may lie in the user program or in the
environment.
If it is forced, release the force designation
then execute the EEPROM write
operation.
In force run mode physical inputs and
outputs are not updated.
Download the application now
and execute ladder.
Replace the faulty unit or else the
V200 CPU may be faulty.
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