Omron GRT1 - 11-2007 Operation Manual page 316

Troubleshooting by Unit
Troubleshooting for
Digital I/O Units
Model
Digital Output Units The output is turned
ON, but no output is
GRT1-OD@(-1)
performed, and the I/
GRT1-ROS2
O indicator is OFF.
The output is turned
ON, and the I/O indi-
cator is ON, but no
output is performed.
The output cannot be
held when a commu-
nications error or bus
error occurs.
The output cannot be
cleared when a com-
munications error or
bus error occurs.
Digital Input Units There is a delay in the
ON or OFF timing of
GRT1-ID@(-1)
the input value.
The connected device
is ON, but it is not
input and the I/O indi-
cator is not lit.
The connected device
is ON, and the I/O
indicator is lit, but the
Unit is not input.
Details
A bus error or communications error
occurred.
The I/O power is not being supplied.
Wiring with the connected device is per-
formed incorrectly.
Connections between the base blocks of
the Slice I/O Unit are not made properly.
(Refer to the following figure.)
The terminal block is disconnected.
The Unit's Output Hold/Clear setting is set
to clear outputs when a communications
error or bus error occurs.
The Unit's Output Hold/Clear setting is set
to hold outputs when a communications
error or bus error occurs.
The input filter may be set.
The I/O power is not being supplied.
Wiring with the connected device is per-
formed incorrectly.
Connections between the base blocks of
the Slice I/O Unit are not made properly.
(Refer to the following figure.)
The terminal block is disconnected.
A bus error or communications error
occurred.
Probable cause
The I/O power supply
connectors on the Slice I/O
Units are not interlocked
properly.
The I/O power supply
connectors on the Slice I/O
Units are not interlocked
properly.
Section 9-5
Remedy
Check whether there is an
error in the slice bus or host
communications.
Check whether the I/O power
is being supplied.
Check the wiring with the
connected device.
Check whether the connec-
tions are made properly.
Check whether the terminal
block is disconnected.
Set the Unit's Output Hold/
Clear setting to hold outputs
when a communications error
or bus error occurs.
Set the Unit's Output Hold/
Clear setting to clear outputs
when a communications error
or bus error occurs.
Set the input filter value to 0
or set an appropriate value
for the input filter.
Check whether the I/O power
is being supplied.
Check the wiring with the
connected device.
Check whether the connec-
tions are made properly.
Check whether the terminal
block is disconnected.
Check whether there is an
error in the slice bus or host
communications.
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