Panasonic GTWIN Reference Manual page 241

Troubleshooting
Mitsubishi PLCs
Error code
GT01/11/21 Other GT
—
ERFF
—
ER10
—
ER12
ER61 ERFFFE
Omron PLCs

Error codes other than these are based on Omron PLC error codes.

Be sure to use the PLC in monitor mode. Otherwise, communication will not
work properly.
Error code
GT01/11/21 Other GT
—
ER00
ER01 ER001
ER10 ER0010
ER12 ER0012
240
Error
Time up error.
There is no response from
the PLC.
Data error.
A data error occurred
during communication.
Overrun error.
The PLC is not receiving
data.
NAK error.
A NAK error has been
returned from the PLC.
Error
Time up error.
There is no response from
the PLC.
Cannot be executed due
to operation mode. (The
PLC received a command
that cannot be executed in
the operation mode.)
Data error.
A data error occurred
during communication.
Overrun error.
The GT unit cannot
GTWIN Reference Manual
Possible cause and solution
 The PLC connection cable is disconnected.
Check the cable.

There is a temporary error due to noise, etc.
Resupply power to the PLC and GT unit.
 The communication settings for the PLC and
GT do not match. Check them.

There is a temporary error due to noise, etc.
Resupply power to the PLC and GT unit.
PLC runaway might be the problem.
Verify the PLC settings.
Possible cause and solution
 The PLC connection cable is disconnected.
Check the cable.

There is a temporary error due to noise, etc.
Resupply power to the PLC and GT unit.
Change the PLC mode from operation to monitor
mode.
Check for errors in the communication settings.
PLC runaway might be the problem.