Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 191)

Publication 1784-UM003A-EN-P – June 2003
Creating & Configuring Your Coordinate System Tag 183
Units Tab The Units Tab of the Coordinate System Properties is where you determine
the units that define the coordinate system. This screen is where you define the
Coordination Units and the Conversion Ratios.
Coordination Units
The Coordination Units field lets you define the units to be used for measuring
and calculating motion related values such as position, velocity, and the like.
The coordination units do not need to be the same for each coordinate system.
Enter units that are relevant to your application and maximize ease of use.
When you change the Coordination Units, the second portion of the
Coordination Ratio Units automatically changes to reflect the new units.
Coordination Units is the default.
Axis Grid
The Axis Grid of the Units page displays the axis names associated with the
Coordinate System, the conversion ratio, and the units used to measure the
conversion ratio.
Axis Name
The Axis Name column contains the names of the axes assigned to the
Coordinate System in the General screen. These names appear in the
order that they were configured into the current coordinate system. This
column is not editable from this screen.
Conversion Ratio
The Conversion Ratio column defines the relationship of axis position
units to coordination units for each axis. For example: If the position
units for an axis is in millimeters and the axis is associated with a
coordinate system whose units are in inches, then the conversion ratio
for this axis/coordinate system association is 25.4/1 and can be
specified in the appropriate row of the Axis Grid.
Note: The numerator can be entered as a float or an integer. The
denominator must be entered as an integer only.
Conversion Ratio Units
The Conversion Ratio Units column displays the axis position units to
coordination units used. The Axis Position units are defined in the Axis
Properties – Units screen and the coordination units are defined in
Coordinated System Properties – Units screen. These values are
dynamically updated when changes are made to either axis position units
or coordination units.