User`s manual

Using the Electronic CAM Feature
GFK-1742A Chapter 16 Using the Electronic CAM Feature 16-33
16
Figure 16-24. CAM Editor CAM Type Selection
Step 7: Specify the Correction Property
The last item we need to specify for the simple example is the correction status. The Correction
property determines whether the motion module will permit an online correction for a specific
sector. A sector is a region of a CAM profile defined by at least two adjacent user-defined points.
The sector includes the user-defined points, the curve connecting them and also up to, but not
including, the first point defined for the next adjacent sector. The points included in a given sector
are denoted by the Sector Bracket, shown in the figure above. Each sector is assigned a curve-fit
order number, also shown in the figure above. The segments of the profile between user-defined
points are defined by polynomials of the curve-fit order specified. A unique polynomial is used to
interpolate between each pair of adjacent user-defined points. Although the actual polynomial
coefficients can be different for each segment, the curve-fit order is the same throughout the sector.
A sector is indicated in the CAM profile table as a bar spanning the user-defined Master Position
values included in the sector. Initially, all points defined in a profile are included in a single sector.
This single initial sector can be subdivided as required to facilitate smoothing a CAM profile.
When the Correction property is Enabled, the motion module reports a warning if there is a
velocity limit violation. When the Correction property is set to Disabled, the motion module
reports an error for these violations and stops the slave axis.
For our example, we want correction enabled. To enable correction, select the sector from the
CAM profile table by clicking it. This will cause the Inspector window to display the sector
properties and allow them to be edited. In our case, select the Correction drop down box and
choose Enabled (Figure 16-25).
Curve-Fit
Order Number
Sector
Bracket
CAM Type
Drop-Down
Menu