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MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.4.4 Hardware stroke limit function
In the "hardware stroke limit function", limit switches are set at the upper/lower limit of
the physical moveable range, and the control is stopped (by deceleration stop) by the
input of a signal from the limit switch. Damage to the machine can be prevented by
stopping the control before the upper/lower limit of the physical moveable range is
reached.
The details shown below explain about the "hardware stroke limit function".
(1) Control details
(2) Wiring the hardware stroke limit
(3) Precautions during control
(4) When the hardware stroke limit is not used
(1) Control details
The following drawing shows the operation of the hardware stroke limit function.
Mechanical stopper
Servo amplifier*
AD75
Movement direction
Deceleration stop at
upper limit switch detection
AD75 control moveable range
Lower limit
Upper limit
Start
Upper limit switchLower limit switch
Start
Movement direction
Mechanical stopper
Deceleration stop at
lower limit switch detection
* The B type servo amplifier does not have the stroke limit input.
Fig. 12.19 Hardware stroke limit function operation
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