Inching Operation; Outline Of Inching Operation - Mitsubishi Electric MELSEC-Q Series User Manual

11.3 Inching operation

11.3.1 Outline of inching operation

PLC READY signal
All axis servo ON
READY signal
Cd.181 Forward run JOG start
BUSY signal
Positioning complete signal
( Md.31 Status:b15)
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 ([Cd.181]) or reverse JOG start signal ([Cd.182]) is turned ON.
The following shows the example of inching operation.
When the start signal is turned ON, inching operation is carried out in the direction
1)
designated by the start signal. In this case, BUSY signal is turned from OFF to ON.
The workpiece is moved by a movement amount set in "[Cd.16] Inching movement
2)
amount".
The workpiece movement stops when the speed becomes "0". In this case, BUSY signal
3)
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 "[Pr.40]
4)
Positioning complete signal output time" has been elapsed.
ON
[Y0] OFF
[Y1]
OFF
ON
[X0]
OFF
OFF
[X10 to X1F] OFF
OFF
Fig. 11.11 Inching operation
Important
When the inching operation is carried out near the upper or lower limit, use the
hardware stroke limit function (Refer to Section 13.4.4).
If the hardware stroke limit function is not used, the workpiece may exceed the
movement range, and an accident may result.
2)
Forward run inching operation
1) 3)
ON
ON
ON
ON
Pr.40
Positioning complete signal
output time
11 - 15
Chapter 11 Manual Control
4)