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8.2.3 OPR method (1): Near-point dog method
The machine OPR is started.
1)
(The machine begins the acceleration designated in "
"
OPR direction
Pr.44
2)
The machine begins decelerating when the near-point dog ON is detected.
The machine decelerates to the "
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.
The OPR complete flag (
5)
from ON to OFF.
POINT
After the home position return
(OPR) has been started, the
zero point of the encoder must
be passed at least once before
point A is reached.
Machine OPR start
(Positioning start signal)
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 OPR method "near-point dog method".
Operation chart
". It then moves at the "
Pr.47
: b4) turns from OFF to ON and the OPR request flag (
Status
Md.31
V
Pr.46
1)
Near-point dog
ON
OFF
ON
OFF
)
OFF
)
Standby
OPR
0
Inconsistent
Value of the machine moved is stored.
Inconsistent
Fig. 8.4 Near-point dog method machine OPR
OPR acceleration time selection
Pr.51
" when the acceleration is completed.)
OPR speed
Pr.46
", and subsequently moves at that speed.
Creep 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
Standby
Value of
OP address
8 - 8
Chapter 8 OPR Control
", in the direction designated in
Md.31
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 machine OPR stop
position may deviate by one servomotor
rotation.
1
: b3) turns
Status
1
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