Mitsubishi Electric GOT2000 Series Connection Manual page 516

(2) Other than QCPU (Q mode)
Assign the GOT to an empty I/O slot on the extension base unit.
When there is no extension base unit or no empty I/O slots are left on an extension base unit, set an additional stage,
and assign the GOT to one of the I/O slots.
(Assigning the GOT to an empty slot on the main base unit is not allowed.)
(a) When there is an empty I/O slot on the extension base unit
(b) When there are no empty I/O slots on the extension base unit
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8.3 GOT Side Settings
Main base unit
A1S35B
Extension base unit
A1S65B
· · · · Slot No.
0 1
Stage No. :1 Stage No.
Slot No. :2 Slot No.
Main base unit
A1S35B
Extension base unit
A1S65B
Stage No. :2 Stage No.
Slot No. :0 Slot No.
:1 Stage No. :1
:3 Slot No. :4
:2 Stage No. :2
:1 Slot No. :2