Error

Error message

Action

Channel No.

code

storage

 

 

 

 

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

 

 

Communication timeout.

case an error occurs when using the multi-channel function.

 

 

Refer to the following manual to identify the channel No. in error.

 

402

Confirm communication pathway

 

• This error may occur when the load of the PLC CPU becomes heavier

 

 

or modules.

 

 

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.

 

 

 

 

 

 

 

Either of the overrun error, parity bit error or flaming error was generated

 

 

SIO status error.

when the RS-422 / RS-232 communication was received.

 

 

Confirm the cable omission, status of the PLC.and the transmission

 

403

Confirm communication pathway

 

speed of the computer link.

 

 

or modules.

 

 

Channel No. is not displayed in error code or error message in the case

 

 

 

 

 

 

an error occurs when using the multi-channel function.

 

 

 

 

 

 

Specified station access is out of

• Station numbers other than master/local station are specified at the

 

 

CC-Link connection (via G4).

 

406

range.

 

• A PLC CPU other than QCPU is accessed.

 

 

Confirm station no.

 

 

• Confirm the station number of the project data.

 

 

 

 

 

 

 

 

 

Accessed other network.

• When monitoring other networks

 

407

Reconfigure the [Routing Information Setting] of GT Designer3 or the

 

Change network setting.

 

 

 

[Routing parameters] of GX Developer.

 

 

Cannot perform operation

The operation, which could not be performed during RUN of PLC CPU,

 

410

because of PLC run mode.

was performed.

 

 

stop the PLC.

Stop the PLC CPU.

 

 

 

 

 

 

Memory cassette is

The memory cassette installed in the PLC CPU is EPROM or E2PROM,

 

411

writeprotected.

and it is in a protected status.

 

 

Check the memory cassette.

Confirm the memory cassette installed in PLC CPU.

 

 

 

 

 

 

Cannot read/write device

The key word is set in PLC CPU.

 

412

protected by keyword.

 

Cancel the key word.

 

 

Remove keyword.

 

 

 

 

 

 

 

 

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.

The Ethernet module on the PLC side is set in read-only.

 

Clear setting.

Set the Ethernet module on the PLC side to write-enabled.

 

 

 

 

 

 

Not communicating between

PLC CPU error. Communication between PLC CPU and the PLC side

 

 

Ethernet module impossible.

 

422

CPU and E71. Confirm CPU

 

Confirm whether there is error in PLC CPU by GX Developer etc.

 

 

error.

 

 

(Confirm buffer memory)

 

 

 

 

 

 

 

 

18 - 16

18. TROUBLESHOOTING

 

18.2 Error Message and System Alarm