Mitsubishi FX2N-10GM Hardware / Programming Manual page 208

FX Series Positioning Controllers Operation, Maintenance and Inspection 8
Remarks
If driving a servo motor, operation will not be possible unless LSF and LSR are connected to
the drive unit and the positioning unit is set to always ON (PARA 20: 1) or always OFF (PARA
20: 0).
However, in this connection status, even if LSF or LSR is actuated and the drive unit stops
automatically, the positioning unit will not detect that the drive unit has stopped.
Therefore, it is best to install preliminary limit switches LSF' and LSR' that are actuated before
LSF and LSR, and connect these to the positioning unit.
To avoid this double use, connect LSF and LSR to the positioning unit and set the drive unit
always to ON, in the same way as the stepping motor connection.
8-4