Panasonic GTWIN Reference Manual page 269

Connecting the GT to a PLC

Use with 1:1 connection.

If noise is a problem, use a shielded cable and employ countermeasures
such as installing a ferrite core.

The transfer distance is 30m maximum. (Up to 500m is possible with the
24V type).
Connecting to the FP COM 4 cassette
For more information on the connection via RS485, refer to the GT Series User
Manual.
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GTWIN Reference Manual