DX35/ DX50 How should I connect the MF input if it is not being used?

If the MF input is not used, it should be set to "Inacitve", connected to M (GND) or L+ (24 V) (which one fits, depends from the adjusted settings) to prevent an open wired input. Electromagnetic field influences may trigger the switching operation.

Additional, important information:

The default setting of the MF is "External Teach" and "active high". Before connecting MF to L+, the function for MF must be deactivated, otherwise the MF function will be executed.