Mitsubishi Electronics QD75D, QD75P Inching operation Outline of inching operation Important

11 MANUAL CONTROL

11.3 Inching operation

11.3.1Outline of inching operation Important

MELSEC-Q

When the inching operation is carried out near the upper or lower limit, use the hardware stroke limit function (Refer to Section 12.4.4).

If the hardware stroke limit function is not used, the workpiece may exceed the movement range, and an accident may result.

Inching operation

In inching operation, pulses are input to the drive unit at the first control cycle (1.8 ms) to move the workpiece by a designated movement amount after the forward run JOG start signal [Y8, YA, YC, YE] or reverse JOG start signal [Y9, YB, YD, YF] is turned ON.

The following shows the example of inching operation.

1)When the start signal is turned ON, inching operation is carried out in the direction designated by the start signal. In this case, BUSY signal is turned from OFF to ON.

2)The workpiece is moved by a movement amount set in " Cd.16 Inching movement amount".

3)The workpiece movement stops when the speed becomes "0". In this case, BUSY signal is turned from ON to OFF. The positioning complete signal is turned from OFF to ON. The positioning complete signal is turned from ON to OFF after a time set in

4)" Pr.40 Positioning complete signal output time" has been elapsed.

2)

Forward run inching operation

1) 3) 4)

PLC READY signal [Y0]		ON
	OFF
		ON
QD75 READY signal	OFF
[X0]
		ON
Forward run JOG start	OFF
signal
[Y8,YA,YC,YE]		ON
BUSY signal	OFF
[XC,XD,XE,XF]
		ON
Positioning complete	OFF
signal		Pr.40 Positioning complete signal
[X14,X15,X16,X17]		output time

Fig. 11.12 Inching operation

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