User`s manual

16-18 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
16
Figure 16-11. CAM Data Table User Units Example
The CAM Editor automatically changes the values to correspond with an integer number of
feedback counts. The Editor also rounds the displayed values to limit clutter within the table. Note
that the editor maintains the variable’s precision and it is only the display that is rounded. For
illustration, we will perform the functions that are automatically performed by the CAM editor
below. We first must determine the integer feedback counts that are the closest to our desired
values. Per our example, we see that only two numbers cannot be exactly represented. These are
the Master Position of 75 and the Slave Position of 75. The closest integer count value to these
values is 614 counts and 1,229 counts for the master and slave respectively. The relationship
between the Master Position and Slave Position with respect to User Units and Counts is shown in
Table 16-3.
Master Position
(User Units)
Master Position
(Counts)
Slave Position
(User Units)
Slave Position
(Counts)
0000
74.951171875 614 75.01000000000001 1229
500 4096 250 4096
1000 8192 500 8192
Table 16-3 Relationship Between User Units and Counts in Scaling Example
This agrees with the functions that where automatically performed by the editor. Note that for the
Master Position of 74.951171875, the editor rounds to 75.0. For the Slave Position of
75.01000000000001, the editor rounds to 75.01.