Digital Outputs - Omron NX-ID User Manual

9-5-2

Digital Outputs

Problem
When the output is ON,
nothing is output although
the output indicator is lit.
Although the output is ON,
nothing is output and the
output indicator is not lit
either.
Cannot hold outputs when
NX bus errors or commu-
nications errors occur.
Cannot clear outputs NX
bus errors or when com-
munications errors occur.
NX-series Digital I/O Unit User's Manual (W521)
Assumed cause
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.
The Unit is not wired correctly
with the connected external
device.
The wiring to the connected
external device is discon-
nected.
A connected external device
is defective.
Load short-circuit protection is
in progress.
A communications error
occurred.
The load rejection output set-
ting is set to "OFF".
The load rejection output set-
ting is set to "Hold the present
value".
9 Troubleshooting
Correction
Set the I/O power supply voltage within the rated
range.
Check the wiring with the connected external
device.
Check the wiring with the connected external
device.
Replace the connected external device.
Refer to 7-4-3 Load Short-circuit Protection on page
7-17 and correct the problem.
Check if a communications (NX bus) error
occurred.
Set the load rejection output setting to "Hold the
present value".
Set the load rejection output setting to "OFF".
9
9 - 21