Troubleshooting; When Data Cannot Be Normally Exchanged - Mitsubishi Electric Melsec WS Series User Manual

Troubleshooting

9. Troubleshooting
Figure 72:
Troubleshooting
flowchart when data
cannot be normally
exchanged

9.1 When data cannot be normally exchanged

Refer to the following flowchart when the WS0-GETH cannot normally exchange
data with the communication-target module.
Data cannot be normally
exchanged.
Check the status of
the CPU module connected
to the WS0-GETH.
Is the CPU module
operating normally?
YES
Check the status of the PWR LED
on the WS0-GETH.
Is the PWR LED on?
YES
Check the status of the MS LED
on the WS0-GETH.
Is the MS LED on
in green?
YES
Check the status of the LINK/ACT
LED on the WS0-GETH.
Is the
LINK/ACT LED (on the
cable-connected side)
flashing or on?
YES
Check the communication state
of the QJ71E71-100.
Go to the flowchart
"when data cannot be exchanged
in polling mode (reading/writing)".
NO
Eliminate the error, referring to the Safety
Controller User's Manual.
- Check if power is supplied to the CPU module.
NO
- Remove the WS0-GETH, mount it again,
and then restart the system.
Off
Remove the WS0-GETH, mount it again, and then restart the system.
If the LED remains off even after restarting, the module may have failed.
Flashing in red (1Hz)
- If the configuration data has not yet transferred, transfer it.
NO - If the configuration data is being transferred, wait for the completion.
Flashing in red (2Hz)
Restart the system. If the LED flashes even after restarting,
the module may have failed.
On in red
Another module in the system may have a critical error.
Search for the error module with Setting and Monitoring Tool and eliminate
the error.
Flashing in red and green
- Check if either the QJ71E71-100 or the WS0-GETH has been configured
as a master module.
- Check if the parameter configuration such as an IP address is correct.
- Check the network totally including the communication path between
the WS0-GETH and the QJ71E71-100, a noise, and installation status.
- Check if no other devices on the network has the same IP address.
- Check the communication state of the QJ71E71-100.
NO - Check if the cable is properly connected.
- Replace the cable.
Go to the flowchart
"when data cannot be exchanged
in auto update mode".
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