User guide

5 Function blocks
5.3 L_CamCurve - curve interpolation for characteristics
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Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.3.2 Function
The following characteristic with 4 grid points and a percentage scaling of the x and y axis are given:
[5-11] Example: characteristic
Assumption: At the input dnXInput the value "25 %" is available.
1. The FB first identifies the two adjacent grid points, in the example the grid points 1 and 2.
2. Afterwards the FB interpolates linearly between the two grid points and shows the interpolated
value (in our example "37.5 %") at the output dnYOutput.
Scaling of characteristics
The scaling of characteristics cannot only be preselected in the »Cam Designer«/»Cam Editor« in
percent, but can be set independently for the x axis and the y axis (e. g. percent, increments, or every
other application unit of an existing measuring system).
Grid point 1 2 3 4
x value 0 % 50 % 75 % 100 %
y value 25 % 50 % 50 % 100 %
37.5 %
25 %
50 %
75 %
100 %
25 % 50 % 75 % 100 %
dnYOutput
dnXInput
 Note!
Observe that the corresponding input and output signals are correctly processed accor-
ding to the respective scaling.