Mitsubishi Electric GT15-J71GP23-SX User Manual page 17

(6) Fix the CC-Link IE communication unit by tightening two board fixing
screws with a tightening torque of 0.36 to 0.48 N•m.
5)
(7) When installing an extension unit on the unit that has been installed,
remove the connector cover and the stickers.
When not installing an extension unit on the unit that has been installed,
in order to avoid receiving electrostatic, stick accessory stickers to cover
the top of mounting screws (4 places).
Keep the connector cover fixed.
Keep the accessory sticker stuck.
Point
Remove the screws that fixes the extension interface relay board before removing the unit.
(Above (6))
6)
Connector cover Accessory sticker
Accessory sticker
Sticker
7