Ellipse Interpolation

Ellipse interpolation is used to move two axes in an elliptical path.

  • XPM_ELIN is used to execute the ellipse interpolation from the Position data table.

  • The axes being controlled must already be configured using the XG-PM software before using XPM_ELIN.

  • XPM_ELIN uses a Step in the position table that is configured to perform circular interpolation.

  • Starting position and end position must be the same when executing ellipse interpolation.

  • A ratio of 100% will just move in a circle.

Video Tutorial

XPM_ELIN Details

Element Name Element Type Description
REQ Input Edge detected request to execute the function block
BASE Input Base number of the motion controller.Equal to 0 for built-in position control.
SLOT Input Slot number of the motion controller.Equal to 1 for built-in position control
AXIS Input Axis number to control.Set to 1 thru 6 for built-in axes. This can be a constant or variable.
STEP Input Step to execute in the position table.Must be a value between 0 – 400.If value is set to 0, then the current step is executed.This can be a constant or variable.
RATIO Input Ellipse Ratio (%). Value range of 1 to 65535.A value of 10000 equals 100%.
DEG Input Operating Angle in degrees.Value range of 1 to 65535.A value of 3600 equals an angle of 360 degrees.
DONE Output Status that function block is done.
STAT Output Current status of the function block.Non-zero numbers will be an error or warning.

 

This example shows control of Axis 1 and 2 by an XEM-DN32HP CPU. The example shows the axes performing an ellipse.

Step Action
1

Open the XG5000 project for the application. Go to Tools menu èPosition Control to open XG-PM software.
2

Open the XG-PM project or connect to PLC and select ProjectèOpen from PLC.
3

Open the Parameter file in the Workspace for the axis that is being configured. This example shows Axis #1.

This parameter screen will open:
4

Configure the parameters of the Axis. This example shows Axis 1.
5 Configure Axis 2.
6

Save the project. Connect to the CPU and write the project to the CPU.

Note: If connecting XG5000 and XG-PM at the same time, make sure to connect XG5000 first. XG5000 will give error messages if it is connected last.

The Position table is setup in the XG-PM software.

Step Action
1

Open the XG5000 project for the application. Go to Tools menu èPosition Control to open XG-PM software.
2

Open the XG-PM project or connect to PLC and select ProjectèOpen from PLC.
3

Open the Position Data table in the Workspace for the axis that is being configured. This example shows Axis #1.

The position data table will open:

  • In this example Axis 1 is the main axis and Axis 2 is the sub axis.

  • The control types of Axis 1 and Axis 2 must match when using an ellipse interpolation move.

  • The Target positions should equal start position when doing an ellipse.

  • The circular interpolation mode can be set to Center-Point, CW or Center-Point, CCW.

  • A valid circular interpolation auxiliary point (center point) must be entered.

  • In this example, the target position for Axis 1 and 2 are (0,0) in the relative mode. This means Axis 1 and 2 will go back to the starting position.

XPM_ELIN Code for Example

XG5000 Trend of Example

 

 

 

 

 

 

LP532