Mitsubishi Electric MELSEC-L LD75P User Manual page 382

● 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 LD75 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
(3) 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 item
[Da.1]
[Da.2]
[Da.3]
[Da.4]
[Da.5]
Axis 1 positioning
data No. 1
[Da.6]
[Da.7]
[Da.8]
[Da.9]
[Da.10]
Refer to  Page 152, Section 5.3 for information on the setting details.
380
2 5 . m
2 pulses
2 pulses
Setting example
Operation pattern Positioning complete
Control system Fixed-feed 1
Acceleration time No.
Deceleration time No.
Axis to be
interpolated
Positioning
address/movement 8000.0m
amount
Arc address
Command speed 6000.00mm/min
Dwell time 500ms
M code
1.0 = 2.5 pulses
2
3 pulses (=2.5+0.5)
2 pulses
0.5 pulse held by the LD75 is cleared to 0 at start
and not carried to next positioning.
Set "Positioning complete" assuming that the next positioning data will
not be executed.
Set 1-axis fixed-feed control.
Designate the value set in "[Pr.25] Acceleration time 1" as the
1
acceleration time at start.
Designate the value set in "[Pr.10] Deceleration time 0" as the
0
deceleration time at deceleration.

Setting not required. (Setting value will be ignored.)
Set the movement amount. (Assuming "mm" is set in "[Pr.1] Unit
setting".)

Setting not required. (Setting value will be ignored.)
Set the speed during movement.
Set the time the machine dwells after the positioning stop (pulse output
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.
5 . m
0.5 pulse held by the LD75 is
carried to next positioning.
Setting details