Hardware Stroke Limit Function - Mitsubishi Electric MELSEC-L02SCPU User Manual

7.10.5

Hardware stroke limit function

The hardware stroke limit function stops the control (after deceleration) by detecting an input from the upper and lower
limit switches that are installed at the upper and lower limit of the physical moving range. Equipment damage can be
prevented by this function. Normally a hardware stroke limit is set on the stroke limit on the drive unit side or inside of
the stroke end, to stop the control before this stroke limit or stroke end is reached. For the limit signal, select either the
upper limit signal or lower limit signal using the built-in I/O function setting.
(1) System overview
Mechanical
stopper
Stroke limit
of the drive
unit
(2) Precautions
While the axis is stopped outside the controllable range (outside the upper or lower limit switch) or after detection
of a limit switch, OPR control and positioning control cannot be started. Start each control after moving the
workpiece to inside the controllable range via JOG operation.
Lower limit
Controllable range
Start
Moving direction
Decelerates and stops
upon detection of the lower
limit switch
Lower limit switch
CHAPTER 7 POSITIONING FUNCTION
Upper limit
Start
Moving direction
Decelerates and stops
upon detection of the upper
limit switch
Upper limit switch
Mechanical
stopper
LCPU
Stroke limit
of the drive
unit
Drive unit
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