Omron NX-IA3117, User Manual

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9 Troubleshooting
9 - 18 NX-series Digital I/O Unit User’s Manual (W521)
9-5-2 Digital Outputs
Problem Assumed cause Correction
When the output is ON,
nothing is output although
the output indicator is lit. The I/O power is not supplied. Check that the I/O power is supplied.
The I/O power supply voltage
is outside the rated range.
Set the I/O power supply voltage within the rated
range.
The Unit is not wired correctly
with the connected external
device. Check the wiring with the connected external
device.
The wiring to the connected
external device is discon-
nected. Check the wiring with the connected external
device.
A connected external device
is defective. Replace the connected external device.
Although the output is ON,
nothing is output and the
output indicator is not lit
either. A communications error
occurred. Check if a communications (NX bus) error
occurred.
Cannot hold outputs when
communications errors
occur. The load rejection output set-
ting is set to "OFF". Set the load rejection output setting to "Hold the
present value".
Cannot clear outputs
when communications
errors occur. The load rejection output set-
ting is set to "Hold the present
value". Set the load rejection output setting to "OFF".