491
CHAPTER 11 MANUAL CONTROL
11
11.
3 I
n
ching
O
perat
ion
11.3
Inching Operation
11.3.1
Outline of inching operation
When the inching operation is carried out near the upper or lower limit, use the hardware stroke limit function. (
541, 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.
(1) Inching operation
In inching operation, pulses are input to the drive unit at 1.8ms 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. At this time, the BUSY signal changes 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.
OFF
ON
OFF
OFF
ON
OFF
ON
ON
OFF
ON
1.
2.
3.
4.
PLC READY signal
[Y0]
LD75 READY signal
[X0]
Forward run JOG start
signal
[Y8,YA,YC,YE]
BUSY signal
[XC,XD,XE,XF]
Positioning complete
signal
[X14,X15,X16,X17]
Forward run inching operation
Pr.40 Positioning complete signal
output time
Содержание MELSEC-L LD75D
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