Mitsubishi Electric MELSEC iQ-R Series User Manual page 80

When the movement amount is converted to the actual number of command pulses, a fraction appears after
the decimal point, according to the movement amount per pulse. This fraction is normally retained in the
Motion module and reflected at the next positioning.
For the fixed-feed control, since the movement distance is maintained constant (= the command number of
pulses is maintained constant), the control is carried out after the fraction 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 command pulses: 2.5 [m]/1.0 = 2.5 [pulse]
When the "reference axis speed" is set in 2- to 4-axis fixed-feed control, set so the major axis side becomes
the reference axis. If the minor axis side is set as the reference axis, the major axis side speed may exceed
"[Pr.8] Speed limit value".
Refer to the following for the combination of the reference axis and the interpolation axis.
Page 57 Interpolation control
3 MAJOR POSITIONING CONTROL
78
3.2 Setting the Positioning Data
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2.5 μm
Movement
amount
INC Linear 1
2 pulses
Fixed-feed 1
2 pulses
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2.5 μm
0.5 pulses held by the Motion module
are carried to next positioning.
3 pulses (= 2.5 + 0.5 )
2 pulses
0.5 pulses held by the Motion module
are cleared to 0 at start and
not carried to next positioning.