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8 OPR CONTROL
8.2.3 OPR method (1): Near-point dog method
The following shows an operation outline of the "near-point dog method" OPR method.
The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51
1)
designated in " Pr.44
completed.)
2)
The machine begins decelerating when the near-point dog ON is detected.
The machine decelerates to the " Pr.47
3)
(At this time, the near-point dog must be ON. The workpiece will continue decelerating and stop if the near-point dog is
OFF.)
After the near-point dog turns OFF, the pulse output from the QD75 will stop at the first zero signal,
outputting a "deviation counter clear signal" to the drive unit.
4)
(The "deviation counter clear signal output time" is set in
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag (
5)
b4) turns from OFF to ON and the OPR request flag (
Machine OPR start
(Positioning start signal)
OPR request flag
Status: b3
Md.31
OPR complete flag
Status: b4
Md.31
Deviation counter clear output
Axis operation status
Md.26
Md.34
Movement amount after
near-point dog ON
Md.20
Current feed value
Md.21
Machine feed value
Operation chart
OPR direction". It then moves at the " Pr.46
Creep speed", and subsequently moves at that speed.
V
OPR speed
Pr.46
1)
Near-point dog
OFF
Zero signal
ON
OFF
ON
OFF
OFF
In OPR
Standing by
0
Inconsistent
Inconsistent
Value of the machine moved is stored.
Fig. 8.2 Near-point dog method machine OPR
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OPR acceleration time selection", in the direction
OPR speed" when the acceleration is
Pr.55
.)
Md.31
Status: b3) turns from ON to OFF.
Deceleration at the near-point dog ON
Pr.47
Creep speed
t
2)
3)
4) 5)
Md.34
Movement amount after near-point dog ON
ON
Adjust so the near-point dog OFF position is
as close as possible to the center of the zero
signal HIGH level.
If the near-point dog OFF position overlaps with
the zero signal, the machine OPR stop position
may deviate by one servomotor rotation.
One servomotor rotation
ON
Deviation counter clear
Pr.55
signal output time
Standing by
Value of
1
OP address
8 - 6
MELSEC-Q
Md.31
Status:
1
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