Mitsubishi Electric GOT2000 Series Connection Manual page 806

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14.3 Ethernet Connection
POINT POINT POINT
Ethernet setting for GT21 and GS
(1) Effective range of the Ethernet setting
Only [1] to [4] of the Ethernet setting can be used for the GT21 and the GS. Even though [5]
or later of the Ethernet setting is written to the GT21 and the GS, the setting is disabled on
the GT21 and the GS side.
(2) Range of the host station setting
Set a host station within the range of [1] to [4] of
the Ethernet setting.
Only [1] to [4]
can be used.