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MELSEC-Q
8 OPR CONTROL
8.2.4 OPR method (2): Stopper method 1)

The following shows an operation outline of the "stopper meth od 1 )" OPR met h od.

Operation chart
1)
The machine OPR is started.
(The machine begins the acceleration designated in " Pr.51 OPR acceleration time selection", in the dir ection designated in
"Pr.44 OPR direction". It then moves at the " Pr.46 OPR speed" when the acceleration is co mp le te d .)
2) The machine begins decelerating when the near-point do g ON is detected.
3) The machine decelerates to the " Pr.47 Creep speed", and subsequently moves at that spee d.
(Torque limiting is required at this time. If the torque is not limited, the servomotor m ay fail in step 4).)
4) The machine presses against the stopper at the creep speed and sto ps.
5)
The pulse output from the QD75 will stop when the " Pr.49 OPR dwell time" has elapsed after the near-poin t dog tu rn s ON,
outputting the "deviation counter clear output" to the drive unit.
(A "deviation counter clear signal output time" is set in the Pr.55 .)
6) After a "deviation counter clear output" is output to the dr i ve uni t, th e O PR co mp le te flag (Md.31 Status: b4) turns from OFF to ON ,
and the OPR request flag ( Md.31 Status: b 3) turns from ON to OFF.
0
t
ON
OFF
Valid torque limit range
Torque limit
Dwell time measurement Time out of dwell time
ON
OFF
OFF
ON
V
ON
1) 2) 3) 4) 5)6)
Range in which the servomotor rotation
is forcibly stopped by the stopper
Near-point dog OFF
Machine OPR start
(Positioning start signal)
Deviation counter clear output
Md.26 Axis operation status Standing by
Inconsistent
Inconsistent
In OPR Standing by
OP address
Value the machine moved is stored
Pr. 46 OPR speed
Pr. 47 Creep speed
OPR request flag
[ Md.31 Status : b3]
OPR complete flag
[ Md.31 Status : b4]
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
Stops at stopper
Pr.55 Deviation counter clear signal
output time

Fig. 8.4 Stopper method 1) machine OPR