Mitsubishi Electric MELSEC iQ-R RD75P4, Руководство пользователя

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3 MAJOR POSITIONING CONTROL
3.2 Positioning Data Setting
• When the movement amount is converted to the actual number of output pulses, a fraction after the decimal
point appears according to the movement amount per pulse. This fraction is usually retained in the RD75
and will be reflected at the next positioning. For the fixed-feed control, since the movement amount is
maintained constant (= the number of output pulses is maintained constant), the control is performed after
the fractional pulses are cleared to 0 at the start.
• If Reference axis speed is used for the 2-axis fixed-feed control, 3-axis fixed-feed control, or 4-axis fixed-
feed control, set the major axis as the reference axis. If the minor axis is set as the reference axis, the
speed of the major axis cannot be suppressed with [Pr.8] Speed limit value.
• For the combinations of the reference axis and interpolation axes, refer to the following.

Page 77 Interpolation control
Accumulation/cutoff of fractional pulses
When movement amount per pulse is 1.0μm and movement of 2.5μm is executed twice;
Conversion to output pulses: 2.5[μm] ÷ 1.0 = 2.5 pulses
2.5μm 2.5μm
INC1
Fixed-feed 1
2 pulses 3 pulses (= 2.5 + 0.5)
2 pulses
2 pulses
Movement
amount
Pulse output
The 0.5 pulse held by the RD75 is
carried over to the next positioning.
The 0.5 pulse held by the RD75 is cleared to 0 at start
and not carried over to the next positioning.