Mitsubishi QD75P1N User Manual page 361

9 MAJOR POSITIONING CONTROL
POINT
•
When the movement amount is converted to the actual number of output pulses, a fraction appears after
the decimal point, according to the movement amount per pulse. This fraction is normally retained in the
QD75 and reflected at the next positioning.
For the fixed-feed control, since the movement distance is maintained constant (= the output number of
pulses is maintained constant), the control is carried out after the fractional pulse is cleared to zero at
start.
Accumulation/cutoff for fractional pulses
When movement amount per pulse is 1.0 m and movement for 2.5 m is executed two times;
Conversion to output pulses: 2.5[ m]
Movement
amount
Output pulses
INC line1
Fixed-feed 1
Setting item
Da.1 Operation pattern
Da.2 Control system
Acceleration time
Da.3
No.
Deceleration time
Da.4
No.
Axis to be
Da.5
interpolated
Positioning address/
Da.6
movement amount
Da.7 Arc address
Da.8 Command speed
Da.9 Dwell time
Da.10 M code
* Refer to Section 5.3 "List of positioning data" for information on the setting details.
1.0 = 2.5 pulses
2.5 m
2 pulses
2 pulses
Positioning data setting example
The following table shows setting examples when "1-axis fixed-feed control (fixed-
feed 1)" is set in positioning data No. 1 of axis 1.
Setting example
Positioning Set "Positioning complete" assuming the next positioning data will not
complete be executed.
Fixed-feed 1 Set 1-axis fixed-feed control.
Designate the value set in " Pr.25
1
acceleration time at start.
Designate the value set in " Pr.10
0
deceleration time at deceleration.
– Setting not required (setting value will be ignored).
Set the positioning address. (Assuming "mm" is set in " Pr.1 Unit
8 0 0 0 . 0 μ m
setting".)
– Setting not required (setting value will be ignored).
6000.00mm/min Set the speed during movement to the positioning address.
Set the time the machine dwells after the positioning stop (pulse output
500ms
stop) to the output of the positioning complete signal.
Set this when other sub operation commands are issued in
10
combination with the No. 1 positioning data.
2.5 m
0.5 pulse hold by the QD75 is
carried to next positioning.
3 pulses (=2.5+0.5)
2 pulses
0.5 pulse hold by the QD75 is cleared to 0 at start
and not carried to next positioning.
Setting details
9 - 45
MELSEC-Q
Acceleration time 1" as the
Deceleration time 0" as the