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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.4.4 Hardware stroke limit function
!
DANGER
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 "external input connector" of the QD75MH or
servo amplifier. (Refer to the "
Pr.80
External signal selection".)
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.