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18. TROUBLESHOOTING
18.2 Error Message and System Alarm
402
Communication timeout.
Confirm communication pathway
or modules.
The time-out error occurred during communicating.
• Confirm the cable omission and status of the PLC.
Channel No. is not displayed in error code or error message in the
case an error occurs when using the multi-channel function.
Refer to the following manual to identify the channel No. in error.
• This error may occur when the load of the PLC CPU becomes heavier
when accessing other stations. In such a case, transfer the data of the
other stations to the host station PLC CPU and monitor them at the
host.
• Put COM instruction when the PLC scanning is long.
403
SIO status error.
Confirm communication pathway
or modules.
Either of the overrun error, parity bit error or flaming error was generated
when the RS-422 / RS-232 communication was received.
Confirm the cable omission, status of the PLC.and the transmission
speed of the computer link.
Channel No. is not displayed in error code or error message in the case
an error occurs when using the multi-channel function.
406
Specified station access is out of
range.
Confirm station no.
• Station numbers other than master/local station are specified at the
CC-Link connection (via G4).
• A PLC CPU other than QCPU is accessed.
• Confirm the station number of the project data.
407
Accessed other network.
Change network setting.
• When monitoring other networks
Reconfigure the [Routing Information Setting] of GT Designer3 or the
[Routing parameters] of GX Developer.
410
Cannot perform operation
because of PLC run mode.
stop the PLC.
The operation, which could not be performed during RUN of PLC CPU,
was performed.
Stop the PLC CPU.
411
Memory cassette is
writeprotected.
Check the memory cassette.
The memory cassette installed in the PLC CPU is EPROM or E
2
PROM,
and it is in a protected status.
Confirm the memory cassette installed in PLC CPU.
412
Cannot read/write device
protected by keyword.
Remove keyword.
The key word is set in PLC CPU.
Cancel the key word.
420 E71 specification is ASCII.
[ASCII code] is selected in [Ethernet operations] of the PLC side setting.
Select [Binary code].
421
E71 is set as read-only.
Clear setting.
The Ethernet module on the PLC side is set in read-only.
Set the Ethernet module on the PLC side to write-enabled.
422
Not communicating between
CPU and E71. Confirm CPU
error.
PLC CPU error. Communication between PLC CPU and the PLC side
Ethernet module impossible.
Confirm whether there is error in PLC CPU by GX Developer etc.
(Confirm buffer memory)
Error
code
Error message Action
Channel No.
storage