Omron GX-AD0471, User Manual, Page: 288 / 394

12 Troubleshooting and Maintenance
12 - 8 GX-series EtherCAT Slave Unit User’s Manual
Slave Units to which
Expansion Units can be
mounted
I/O communications
stopped after mounting or
removing an Expansion
Unit and turning ON the
power.
The number of I/O points
increase or decrease
when Expansion Units are
mounted or removed. The
number of I/O points may
not conform to the I/O
data assigned to the
EtherCAT Master Unit.
Allocate I/O data again to
the EtherCAT Master Unit.
The [PWR] indicator lights
red after mounting or
removing an Expansion
Unit online.
Expansion Units cannot
be mounted or removed
online.
Turn OFF the power
supply before mounting or
removing Expansion
Units.
Slave Units with digital
inputs
Although a connected
device is ON, nothing is
input and Slave Unit's
input indicator does not
turn ON either.
The I/O power is not
supplied. Check that the I/O power
is supplied.
I/O power supply voltage
is outside the rated range.
Set the I/O power supply
voltage within the rated
voltage.
Wiring with the connected
device is incorrect. Check the wiring with the
connected device.
Terminal block screws are
loosened. (Terminal block
type only)
Check if terminal block
screws are loosened.
A connected device is
disconnected. Check the wiring with the
connected device.
A connected device is
defective. Replace the connected
device.
A connected device is ON
and Slave Unit's input
indicator is turned ON, but
nothing is input.
A communications error
occurred.
Check if a
communications error
occurred.
There is a delay with the
ON and OFF timing for
input values.
An input filter may be set.
Set the input filter value to
0. Alternatively, change
the input filter to an
appropriate value.
Slave Unit type Symptom Cause Measures