LSIS XBF-PN04B, User Manual, Page: 562 / 820

Chapter 9 Functions
9-135
(3) Principle of CAM operation
(a) When CAM operation command is executed, the current position of main axis is recognized as 0.
(b) When the main axis starts operating, “the current position in 1rotation of main axis” increase to “no. of pulse
per 1rotation (-
1)” then become 0. The position value (0~“no. of pulse per 1rotation (-1)”) is repeated.
(c) Calculate CAM data step no. corresponding to “the current position per 1rotation” with “point unit” of CAM
parameter.
t Point Uni
Axis Main of 1rotation per Positio Current
no. Step Data Cam

For example, if the position of main axis at the beginning of CAM operation is 1000, the current position is
1073 and point unit is 10, the step no. of CAM data is as follows.
t Point Uni
Axis Main of 1rotation per Positio Current
no. Step Data Cam

(d) Calculate update position of sub axis with CAM data step. If
main axis is forward direction, calcu
late the position of sub axis with the position corresponding to “the part of
positive number of CAM data step no.” and the position corresponding to “the part of positive number of CAM
data step no. +1”.
Position of sub axis
= {(Step position of CAM data +1)
– (Step position of CAM data)} x Decimal part of CAM data step no.
+ (Step position of CAM data)
For example, if position value of sub axis of step 7 is 395 and step 8‟s is 475, the position of sub axis is as
follows.
419
24 395
3 . 0 ) 395 - 475 ( 395 axis sub of Position

 
  
3 . 7
10
1000 1073


