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MELSEC-Q
8 OPR CONTROL
8.2.8 OPR method (6): Count 2
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
1)
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".)
2)
Near-point dog ON is detected and deceleration starts at the time set in " OPR. 6 ACC/DEC time at OPR".
3)
The machine decelerates to the " OPR. 5 Creep speed", and subsequently moves at that speed.
4)
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 .)
5)
After a "deviation counter clear output" is output to the drive unit, the OPR complete flag (Md. 7Status: b1) turns from
OFF to ON, and the OPR request flag (Md. 7Status: b0) turns from ON to OFF.
t
OPR speed
V
Movement amount after near-point dog ON
Creep speed
OPR control start
(Positioning start signal: Y8 to YF)
ON
OFF
ON
OFF
ON
OFF
Leave sufficient distance from the OP
position to the near-point dog OFF
Axis operation status
Movement amount after
near-point dog ON
Current feed value
OFF
OPR request flag
OPR complete flag
Status: b0
Md.7
Md.4
Md.2
Md.1
OPR.4
OPR.5
OPR.8
Md.2
Deceleration at the near-point dog ON
Bias speed at start
Pr.6
Deviation counter clear signal output time
Pr.8
Deviation counter clear output
1)
2)
3)
4) 5)
Setting for the movement amount
after near-point dog ON
Near-point dog
Status: b1
Md.7
Standby
During OPR
Unfixed
0
Unfixed
Traveled value is stored
Standby
OP address
Value marked
1
1
Fig. 8.11 Count 2 machine OPR control
Summary of Contents for GX Configurator-PT
Page 13: ...MEMO SECTION 1...
Page 127: ...7 20 7 20 MELSEC Q 7 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL MEMO...
Page 129: ...MEMO SECTION 2...
Page 221: ...Index 5 Index 5 MEMO...
