Allen-Bradley 1756-M02AS User Manual page 20

Chapter 1 Create and Configure a Coordinate System
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Table 3 - General Tab Field Descriptions
Item Description
Axis Name The Axis Name column is a list of combo boxes (the Dimension field determines this
number) used to assign axes to the coordinate system.
The pull-down lists display all Base Tag axes defined in the project. (Alias Tag axes do
not display in the pull-down list.) They can be axes that are associated with the
motion group, axes associated with other coordinated systems, or axes from the
Ungrouped Axes folder. Choose an axis from the pull-down list.
The default is <none>. It is possible to assign fewer axes to the coordinate system
than the maximum for the Dimension field. However, you receive a warning when you
verify the coordinate system and, if left in that state, the instruction generates a
runtime error. You can assign an axis only once in a coordinate system. Ungrouped
axes also generate a runtime error.
Ellipsis (...) The Ellipsis in this column takes you to the Axis Properties pages for the axis listed in
the row.
Coordination Mode The Coordination Mode column indicates the axes that are used in the velocity vector
calculations. If the type of coordinate system is specified as Cartesian, then Primary
axes are used in these calculations. For non-Cartesian coordinate systems, the
coordination mode for the axes defaults to Ancillary.
Enable Coordinate System The Enable Coordinate System Auto Tag Update checkbox lets you determine whether
Auto Tag Update the Actual Position values of the current coordinated system are automatically
updated during operation.
Use the checkbox to enable this feature. The Coordinate System Auto Tag Update
feature can ease your programming burden if you must add GSV statements to the
program to get the desired result. However, by enabling this feature, the Coarse
Update rate is increased.
Whether to use the Coordinate System Auto Tag Update feature depends upon the
trade-offs between ease in programming and increase in execution time. You can
lower the execution time if you enable this feature in initial system programming to
formulate the process and then disable it and enter the GSV statements in your
program.
If you enable this feature, it can result in some performance penalty.
Rockwell Automation Publication MOTION-UM002E-EN-P - June 2016