Problems with communication with I/O units
Maintenance/Troubleshooting
1-81
Is the LED indicating an error?
Cause
The DeviceNet unit may not be properly connected or set, or the GP unit may have a
problem.
Solution
Check the status of the following LEDs and correct the problem accordingly.
LED status
Things to be checked next
DeviceNet con-
nector part
Module
LED
Red
Illumi-
nating
The GP unit may be faulty. Please con-
tact your local GP distributor.
)
“1.7.2 Contact us!” (page 1-164)
Flashing
Error occurred. Judged as recoverable
and automatically restoring. If the LED
continues to flash in red, the GP unit
may be faulty. Please contact your local
GP distributor.
)
“1.7.2 Contact us!” (page 1-164)
Green
Flashing
Check the communication settings for
the connected device. Enter offline
mode in the GP unit and select [Periph-
eral Settings], [Device/PLC Settings]
and then [DeviceNet].
Network
LED
Red
Illumi-
nating
The communication with the DeviceNet
and the DeviceNet-related device is not
established. Check if your cable is
DeviceNet-compatible.
Flashing
Timout error occurred. Check the com-
munication settings or reset the GP unit.
Green
Flashing
Is the DeviceNet cable properly con-
nected? Turn OFF the GP unit. Recon-
nect the DeviceNet cable so that the
connector is firmly connected.
Network
LED
Module
LED