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20.3 ERROR MESSAGE AND SYSTEM ALARM
20.3.2 List of Error Message/System Alarm
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 write-
protected. 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)
423
Insufficient network table
information. Add station
no.
The station number set in the project data and the station
number set in the switching station No. device do not exist in
the Ethernet setting of GT Designer2.
1. Add the station number set in the project data to the
Ethernet setting of GT Designer2.
2. When using the station No. switching function, check the
data of the switching station No. device.
When the station number specified in the switching station
No. device is not set in the Ethernet setting, add the
station number to the Ethernet setting.
When the station number does not exist in the system,
change the data of the switching station No. device.
(Set the station number so that it becomes the same as
the station number of the PLC side Ethernet module set in
the parameter setting of GX Developer.)
Error
code
Error message
Action
Channel
No.
storage
