Mapping Onto Negative Axis Positions (E.g. Linear Axes) - Siemens SIMOTION Function Manual

"Unfavorable" starting and end-position default settings for output cams, e.g. output cam
position outside of the track range, can lead to output cams being shifted, or new output cams
being created. This must be taken into account when mapping the cam track onto the axis.
Note
After converting the cam track onto the axis, the effective output cam length is always shorter
than or equivalent to the track length. No output cams are defined outside of the track length.
For standard applications, and in the interests of clear programming, automatic conversion
of output cams should be avoided. This can be achieved by only defining output cams, which
lie within the track length.
Mapping example
A cam track with three output cams (OC1 - OC3) is provided. The end position of output cam
OC2 and the entire output cam OC3 are defined outside of the track length. After being mapped
onto the axis, OC3 is converted to the track length and mapped to position OC3*. A new output
cam OC4* arises from partial output cam OC2.
Figure 4-17
4.2.5.3

Mapping onto negative axis positions (e.g. linear axes)

Output cams on the cam track are always predefined positively. If you want to output output
cams at negative axis positions, the cam track output start must be set in the negative range
by means of the axis reference position.
Example of a linear axis with negative axis position
● Range of linear axis: -1000 mm to +1000 mm (non-modulo axis)
● Output of output cam at axis position: -100 mm to -200 mm
● Cam track length: 2000 mm
● Definition of the output cam on the track: SOC=800 mm; EOC=900 mm
By mapping the cam track via the axis reference position, the output cam OC1 can be output
at a negative axis position.
Output Cams and Measuring Inputs
Function Manual, 04/2014
Parts of cam track lie outside of the track length
Cam Track TO - Part II
4.2 TO Cam Track basics
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