Chapter 7 Motion Control Programming
7-21
7.8 Positions
This section describes the positions that are used in motion control programming.
7.8.1 Postion Types
The command position is the position value that the Motion CPU outputs to drive an axis.
The actual position is the position feedback value from the servo drive or the encoder.
The valid positions for each axis type are listed as below.
7.8.2 Applicable Postions for Each Axis Type
Axis type
*Note: the command position and the actual position is the same on virtual axis.
7.9 Electronic Cam
This section introduces the operation of electronic cam (e-cam), and the steps to applied e-cam by settings in the software
and the motion control instructions related to e-cam. For details about each mentioned instruction, please refer to AH
Motion Controller – Motion Control Instructions Manual.
7.9.1 Introduction of Electronic Cams
A traditional mechanical cam is composed of a cam, a follower, and a support.
1. A mechanical cam is a rotating sliding piece with irregular shape. In general, it is an input object which rotates at a
uniform speed. It makes a follower move regularly by coming into contact with the follower.
2. A follower is a part driven by a mechanical cam. In general, it is an output object which generates motion which is not
uniform, sequential, and regular motion.
3. A support is a piece that which is used to support a mechanical cam and a follower.
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