Hardware Stroke Limit Function - Mitsubishi Electric MELSEC-Q Series User Manual

13.4.4 Hardware stroke limit function

When the hardware stroke limit is required to be wired, ensure to wire it in the negative logic
using b-contact. If it is set in positive logic using a-contact, a serious accident may occur.
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 hardware stroke limit is able to use the following signals. (Refer to the "[Pr.80]
External input signal selection".)
 External input signal of servo amplifier

External input signal via CPU (buffer memory of QD77GF)
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 function is not used
DANGER
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Chapter 13 Control Sub Functions