Mitsubishi Electric 800 Series Instruction Manual page 13

 Insertion positions of screws and spacers (Ethernet model)
Do not insert the plug-in option to the connector 3.
2
(When the option is connected to the connector 3,
Connector 3
it may interfere with the front cover and the inverter
or the option may be damaged.)
Mounting screw
Spacer
The option connector 2 cannot be used because the Ethernet board
is installed in the initial status. The Ethernet board must be removed
Connector 2 Connector 1
to install a plug-in option to the option connector 2.
(However, Ethernet communication is disabled in that case.)
Mounting screw
Spacer
13
INSTALLATION AND WIRING