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Figure 4-18 Linear axis with output of output cam at negative axis position
Please note that during cyclic output (CYCLIC), cam tracks are continued cyclically even with
non-modulo axes, and thus the cam track can be output multiple times to different axis
positions.
If a cam track is to remain switched on permanently and only output at one axis position, we
recommend the following setting: cam track length ≥ axis traversing range.
This setting prevents the cam track from being continued cyclically in the case of cyclic output
of a cam track after execution of the track range (in the figure: axis position - 1000 to +1000).
In the above figure, for example, the cam track would be continued cyclically
● in the positive range from axis position 1000 to 3000; 3000 to 5000 etc
● In the negative range from axis position -1000 to -3000; -3000 to -5000 etc.
.
The same behavior applies also for non-modulo rotary axes.
4.2.5.4
Relation of track length, modulo length and activation mode in mapping
In conventional output-cam output (comparable to mechanical cam controllers), the track
length corresponds to the modulo length of the axis and cyclic output takes place.
With electronic cam controllers, the track length can be shorter or longer than the modulo
length of the axis, therefore offering a greater degree of flexibility.
● Track length (tl) < modulo length (m) (integer ratio m to tl)
Track length is output n-fold (n = m/tl) on modulo length.
● Track length (tl) > modulo length (m) (integer ratio tl to m)
Output takes place on every nth rotation (n = tl/m). Output always takes place after the first
quadrant. If the output takes place differently, a greater track length must be defined and
the output cam placed accordingly.
● Non-integer division ratios lead to the cam track being dislocated on every axis rotation.
Cam Track TO - Part II
4.2 TO Cam Track basics
Output Cams and Measuring Inputs
90
Function Manual, 04/2014
