Lenze PLC Designer PLC-Designer (R2-x) SoftMotion - Manual (Page 103)

DMS 5.2 EN 03/2011 TD17
L
103
L-force | PLC Designer - SoftMotion
CAM editor
Cam data structures
5.7 Cam data structures
During compilation of the project a global variable list (Resources tab in the »PLC
Designer«) named CAM Data is created from the cams programmed in the CAM editor. The
description of each individual cam is written to a structure (one structure per cam)
corresponding to the settings in the 'Build Options' dialog and is thereby made accessible
to the IEC program and the cam POUs. For successful project compilation, the
corresponding structure definitions must be available in the IEC program.
(For this see also the
SoftMotion programming examples
( 267)
.)
Furthermore, an _SMC_CAM_LIST (ARRAY OF POINTER TO MC_CAM_REF) data structure is
also created, referring to the individual cams via pointers.
Of course, the corresponding data structures can also be created and/or completed from
the IEC program during runtime. For this reason they are described in more detail below.
Structure variables which are only of relevance internally are not listed.
5.7.1 MC_CAM_REF
This data structure represents a generic cam and contains the following elements:
wCAMStructID: WORD
The POUs use this variable, which always has a fixed value, to check whether the data
structure entered is an MC_CAM_REF structure.
xStart, xEnd: LREAL
Cam domain. Master start and end position.
byType:BYTE
This variable describes the cam type, i.e. how the cam is represented.
 1: equidistant, 1-dimensional table comprising slave positions
 2: non-equidistant, 2-dimensional table comprising pairs of master/slave points
 3: polynomial description of individual points comprising master position, slave
position, slave velocity and slave acceleration (XYVA)