Opr Method (6): Count 2 - Mitsubishi Electric MELSECQ Series User Manual

8 OPR CONTROL

8.2.8 OPR method (6): Count 2

1)
2)
3)
4)
5)
Machine OPR control start
(Positioning start signal: Y8 to YF)
OPR request flag
Md.7
OPR complete flag
Md.7
Deviation counter clear output
Md.4
Md.2
Md.1
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The following shows an operation outline of the "count 2" OPR method.
The "count method 2)" method is effective when a "zero signal" cannot be received.
Operation chart
Machine OPR control is started.
(Acceleration starts in the direction set in " OPR. 2 OPR direction" at the time set in " OPR. 6 ACC/DEC time at OPR",
and the axis moves at " OPR. 4 OPR speed".)
Near-point dog ON is detected and deceleration starts at the time set in " OPR. 6 ACC/DEC time at OPR".
The machine decelerates to the " OPR. 5 Creep speed", and subsequently moves at that speed.
As soon as the axis has traveled the movement amount set in " OPR. 8 Setting for the movement amount after near-
point dog ON" after near-point dog ON, the pulse output from the QD70 stops (at this time, the axis decelerates to a
stop from " OPR. 5 Creep speed" at the time set in " OPR. 7 DEC/STOP time at OPR") and the "deviation counter clear
output" is output to the drive unit.
(The "deviation counter clear signal output time" is set in Pr. 8 .)
After a "deviation counter clear output" is output to the drive unit, the OPR complete flag ( Md. 7 Status: b1) turns from
OFF to ON, and the OPR request flag ( Md. 7 Status: b0) turns from ON to OFF.
V
OFF
OFF
Status: b0
OFF
Status: b1
Axis operation status
Standby
Movement amount after
Unfixed
near-point dog ON
Unfixed
Current feed value
Fig. 8.11 Count 2 machine OPR control
search engine
Deceleration at the near-point dog ON
OPR.4 OPR speed
Bias speed at start
Pr.6
1) 2) 3)
ON
Near-point dog
OFF
ON
ON
During OPR
0
Traveled value is stored
MELSEC-Q
Setting for the movement amount
OPR.8
after near-point dog ON
Creep speed
OPR.5
t
4) 5)
Md.2
Movement amount after near-point dog ON
Leave sufficient distance from the OP
position to the near-point dog OFF
ON
Deviation counter clear signal output time
Pr.8
Standby
Value marked 1
OP address
1
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