CAM Data Creation and Using XPM_CAM or XPM_CAMO

XEM CPU supports up to 8 different CAM blocks using various CAM profiles.

  • The CAM blocks are created in XG-PM software.

  • The XPM_CAM and XPM_CAMO function blocks are used to execute any created CAM blocks.

  • A User CAM operation is available and is accessed as CAM block number 9.

  • A maximum of 2048 points can be generated per CAM block. An error will appear if a block will have too many points.

  • A CAM block supports one master axis and one sub-axis.

Function Block Description in XG5000 Function
XPM_CAM CAM run Execute a predefined CAM block with the slave axis according to the movement of the master axis.
XPM_CAMO CAM run with master offset Execute a predefined CAM block with the slave axis after the master axis moved the distance defined as the offset.

 

These examples show control of Axis 1 by an XEM-DN32HP CPU.

  • Axis 1 is a LS Electric L7CA004U-AD connected to a linear actuator with a 5 mm pitch.

  • The L7C servo drive is configured to have 1000 pulses be one revolution of the motor.

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

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 XG-PM software is used to create CAM blocks 1 - 8.

Step Action
1

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

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

Open the CAM Data file in the Workspace.

The CAM Block screen will open:

Step Action
1

Choose a CAM block number to configure.
2

Configure the CAM block mode settings.

  • Repeat (Two-way mode): Repeat mode executes the CAM repeatedly according to the position of the main axis in 1 rotation. The end position of the sub axis in the CAM must be set to 0.

  • Increase (Feed mode): Execute CAM operation from the starting position of the sub axis to ending position according to the position in 1 rotation of main axis.

  • Point Unit: Set the resolution from starting position of main axis to ending position of main axis on each step data of the CAM block. A smaller point unit lead to more points of CAM data and potentially smoother CAM operation. If the point unit is too small, the CAM data may exceed the max of 2048 data points and the CAM profile won’t be calculated. The ending position of the main axis must be a multiple of the point unit value.
3

Configure Main and Sub axis parameters.

  • Unit: Set the control units of the main and sub axis. Set to the same value in the “Unit” of the axis basic parameters.

  • Main Axis Unit Settings: pulse, mm, inch, and degree.

  • Sub Axis Unit Settings: pulse, mm, and inch.

  • Travel distance per rotation: Set the transfer distance per 1 revolution of the main axis or sub axis. Used if unit is set to ‘mm’ or ‘inch. This value is the maximum last position of main or sub axis.

  • Pulses per rotation: Set the number of pulses per rotation of main and sub axes. If the unit is ‘pulse’, the value is the maximum last position of the main or sub axis.
4

Enter CAM block data. Make sure block data matches restrictions of CAM block configuration.

  • Main Axis Start Pos: Set the starting position of the main axis in the designated section. The starting position for sections after 1 will be the ending position of the prior section.

  • Main Axis End Pos: Set the ending position of the main axis in the designated section. The ending position of the last section must be set to transfer distance of the main axis.

  • Sub Axis Start Pos: Set the starting position of the sub axis corresponding to the main axis starting position in the designated section. The starting position for sections after 1 will be the ending position of the prior section.

  • Sub Axis End Pos: Set the ending position of the sub axis corresponding to the ending position of the main axis in the designated section. If control method is “Repeat (Two-way mode), the ending position of sub axis in the last section must be 0. If control method is “Increase(Feed mode)”, the ending position of sub axis in the last section generally has to be set as much as the transfer distance per 1rotation set on main/sub axis parameter.

  • CAM curve: Set CAM specific curve to create data ranging from starting position of the sub axis to ending position of sub axis in the designated section. The position of sub axis is calculated by characteristic of selected CAM curve, the position of main axis increase by point unit at the same time.
5

Press Setup complete button to calculate the CAM Profile.

Goes to CAM Profile screen when successful.

Error message if there is a problem
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.

Using XPM_CAM and XPM_CAMO

See the topics below for examples using XPM_CAM and XPM_CAMO.

Using XPM_CAM

Using XPM_CAMO

 

 

 

 

 

 

LP533