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8 OPR CONTROL
8.2.3 OPR method (1): Near-point dog 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.)
4)
After the near-point dog turns OFF, the machine stops. It then restarts and stops at the first zero point.
After a "deviation counter clear signal" is output to the drive unit, the OPR complete flag ( Md.31 Status: b4) turns
5)
from OFF to ON and the OPR request flag ( Md.31 status: b3) turns from ON to OFF.
POINT
After the near-point dog turns OFF,
the machine stops, It then restarts
and at the first zero point.
OPR start
OPR request flag
Status: b3
Md.31
OPR complete flag
Status: b4
Md.31
Axis operation status
Md.26
Md.34
Movement amount after
near-point dog ON
Md.20
Current feed value
Md.21
Machine feed value
The following shows an operation outline of the "near-point dog method" OPR method.
Operation chart
OPR direction". It then moves at the " Pr.46
V
Pr.46
1)
Near-point dog
ON
OFF
ON(1)
OFF(0)
OFF(0)
In OPR
Standing by
0
Inconsistent
Value of the machine moved is stored.
Inconsistent
Fig. 8.2 Near-point dog method machine OPR
OPR acceleration time selection", in the direction
Creep speed", and subsequently moves at that speed.
OPR speed
Deceleration at the near-point dog ON
Pr.47
2)
3)
4) 5)
A
Md.34
ON
OFF
Zero signal
One servo motor rotation
ON(1)
Standing by
Value of
OP address
8 - 6
MELSEC-Q
OPR speed" when the acceleration is
Creep speed
t
Movement amount after near-point dog 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 OPR stop position
may deviate by one servomotor rotation.
1
1
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