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21. ERROR DISPLAY AND CORRECTIVE ACTIONS FOR LIST EDIT
21 - 5
MELSEC
GOT
21.3 Error using list editor function on the link system
When the list editor function is used on the link system, the "PLC communication error
( **)" may appear. In this case, check the error details and the corrective actions.
Error No. Error message Action
2
Time-out error:
No response to the request
Check the cable wiring.
4
Process cancel:
New process request was given to the list editor function while the CPU is processing.
Perform correct key operations on the
GOT.
5
Sum check error:
A sum check error from the link communication has occurred.
There may be noise interference.
Check the system again.
16
PLC No. error:
There is no station corresponding to the PLC number.
Check the PLC number setting. Set
the correct number.
19 This error may occur when the ACPU is reset during monitoring. Perform the monitor setting again.
24
Remote error:
Although remote stop/pause is performed from the computer link unit, remote run/stop
is additionally performed.
Perform the remote run/stop/pause
from either unit.
32
Link error:
While the slave station is monitoring the master station, the master station is reset.
Perform the monitor setting again.
34
EEPROM failure:
The EEPROM, cannot be written due to EEPROM failure.
Replace the EEPROM with a new
one.
If error number "25" appears, the following causes are possible. Check the details and
the corrective actions.
(1) When connected to the master station
Device
number
Description Details
M9210
Link card error
(for master station)
OFF: Normal
ON : Error
The control depends on whether there is an error at the
hardware of the link card. The link card in the CPU link unit is
judged at the CPU. Replace the link unit.
M9224 Link status
OFF: Online
ON : Offline, station-to-station test,
or self-loopback test
The control depends on whether the master station itself is
online or offline, or in the station-to-station mode or the self-
loopback mode. Check the mode switch.
M9227 Loop test status
OFF: Not executed
ON : Normal loop test and sub-
loop test are being executed.
The control depends on whether the master station itself is
executing the normal loop test or the sub-loop test.
(2) When connected to the local station
Device
number
Description Details
M9211
Link card error
(for local station)
OFF: Normal
ON : Error
The control depends on whether there is an error at the
hardware of the link card. The link card in the CPU link unit is
judged at the CPU. Replace the link unit.
M9240 Link status
OFF: Online
ON : Offline, station-to-station test,
or self-loopback test
The control depends on whether the local station itself is online
or offline, or in the station-to-station mode or the self-loopback
mode. Check the mode switch.
M9257 Loop test status
OFF: Not executed
ON : Normal loop test and sub-
loop test are being executed.
The control depends on whether the local station itself is
executing the normal loop test or the sub-loop test.