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Chapter 11 Manual Control
11.3 Inching operation
11.3.1 Outline of inching operation
Inching operation
In inching operation, pulses are output to the servo amplifier at operation cycle to
move the workpiece by a designated movement amount after the forward run JOG
start signal or reverse JOG start signal is turned ON.
Signal QD77MS2 QD77MS4 QD77MS16
Forward run JOG start signal
Y8, YA Y8, YA, YC, YE
[Cd.181] Forward run JOG start
Reverse run JOG start signal
Y9, YB Y9, YB, YD, YF
[Cd.182] Reverse run JOG start
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.
4)
The positioning complete signal is turned from ON to OFF after a time set in "[Pr.40]
Positioning complete signal output time" has been elapsed.
[QD77MS4 operation example]
PLC READY signal [Y0]
OFF
ON
BUSY signal
[XC, XD, XE, XF]
OFF
OFF
ON
Positioning complete
signal
[X14, X15, X16, X17]
OFF
ON
Forward run inching operation
ON
OFF
READY signal [X0]
Forward run JOG start signal
[Y8, YA, YC, YE]
1)
2)
3) 4)
Positioning complete signal
output time
Pr.40
ON
ON
OFF
A
ll axis servo ON
[Y1]
(Note): Refer to Section 3.3 for input/output signal of QD77MS16.
Fig. 11.11 Inching operation