Mitsubishi Electric MELSEC-L LD75P User Manual page 544

(2) Wiring the hardware stroke limit
When using the hardware stroke limit function, wire the terminals of the LD75 upper/lower limit stroke limit as
shown in the following drawing. (When "[Pr.22] Input signal logic selection" is set to the initial value)
Connect the upper/lower limit switches to the directions of increasing and decreasing current feed values respectively.
When these switches are connected in wrong directions, the hardware stroke limit function does not operate properly and
the motor does not stop.
For "[Pr.6] Rotation direction setting", refer to  Page 118, Section 5.2.1.
(3) Control precautions
• If the machine is stopped outside the LD75 control range (outside the upper/lower limit switches), or if
stopped by hardware stroke limit detection, the "OPR control", "major positioning control", and "high-level
positioning control" cannot start.
To carry out these types of control again, return the workpiece to the LD75 control range by a "JOG
operation", "inching operation" or "manual pulse generator operation".
• When "[Pr.22] Input signal logic selection" is set to the initial value, the LD75 cannot carry out the positioning
control if FLS (upper limit signal) is separated from COM or RLS (lower limit signal) is separated from COM
(including when wiring is not carried out).
(4) When the hardware stroke limit function is not used
When not using the hardware stroke limit function, wire the terminals of the LD75 upper/lower limit stroke limit as
shown in the following drawing.
When the logic of FLS and RLS is set to "positive logic" using "[Pr.22] Input signal logic selection", positioning
control can be carried out even if FLS and RLS are not wired.
(Refer to  Page 614, Section 13.4 for details.)
542
LD75
FLS
RLS
COM
24VDC
LD75
FLS
RLS
COM
24VDC