Panasonic GTWIN Reference Manual page 239

Troubleshooting
Error code Error
error
**2000 Connected GT designation
area error
**20FF Token error
**E000 Sending data overflow error
**F000 User's memory error
238
Cause and solution
no. for the GT unit.
The bit in the connected GT designation area corresponding to
the station number of the connected GT is not on.
Check the connected GT designation area.
A GT is not responding to the token.
When the error code is indicated temporarily after the power
is turned on:
 The timing when turning on multiple GT units is different.
Arrange the wiring so that all power supplies are turned on
simultaneously.
 The screens for all GT units have not finished booting.
The error code disappears after all screens have booted.
 The settings for the startup screen display vary.
Make the same setting for all GT units.
 A GT is reading a SD card.
The indication disappears when reading the SD card has
completed.
When the error code is always indicated:
 There is an unconnected or faulty GT.
Check whether a GT indicates [**20FF]. Reconnect the GT, or
turn off the bit in the connected GT designation area.
 The communication parameters are not specified correctly.
Check the baud rate and transmission format for the GT.

The same station number is used for more than one GT unit.
Check the station number setting of the GT units.
The data sent to the PLC has caused an overflow so that not all
data could be transmitted. Check whether the GT communicates
correctly with the PLC.
The memory for saving screen data may be damaged. Please
contact us.
GTWIN Reference Manual