Defining Axes

The RMC70 is a 1- or 2-axis motion controller with possible additional reference axes, with a maximum of 4 axes. The RMC150 can have up to 8 control axes and additional reference axes with a maximum of 16 axes. The user can create axes, define the axis type, and define which physical hardware is assigned to each axis. For details on the axis types supported by the RMC, see the Axis Types Overview topic.

Changing the Axis Definitions

When the RMC powers up for the first time, it will create default axes. You may need to change the axis definitions to fit your application. To change the axis definitions, use the Axis Definitions Dialog:

In the Project pane, expand the Axes folder and double-click Axis Definitions.
To remove an axis, click Remove. To add a new axis, click New. To change an existing axis, click Change.
To change the axis order, use the Move Up and Move Down buttons. The axes will adhere to this order throughout the entire RMC. The Axis Tools and Command Tool will display the axes in this order, and the register addresses and tag names will be defined by this order.

Note: If the controller contains a Universal I/O module, you must first set up it's channels prior to defining axes.

You will need to define the following items for each axis:

Item

Options

Axis Type

Control: Has a physical Control Output and zero to two inputs

Reference: Has only an input

Cascading Outer Loop: Used for Cascade Control

Control Loops

(Control Axes and Cascading outer Loop Axes Only)

None:

For axes with no feedback, only a Control Output

Single-Loop:
For controlling a single quantity, such as position, velocity, acceleration (single- or dual-input), pressure, or force (single- or dual-input)

Dual loop:
For controlling two quantities with a single Control Output, such as position-pressure, position-force, position-acceleration,

velocity-pressure, velocity-force, velocity-acceleration

Output

(Control Axes Only)

Type: Analog ą10V output.

Using: Choose which physical Control Output on the RMC to use.

Feedback Types

(All axes except Control with No control loop)

Type: Position, velocity, acceleration (single- or dual-input), pressure, force (single- or dual-input).
Using: Choose which physical inputs will be assigned to the axis.

Axis Labels

In addition to the axis number assigned by RMCTools, each axis can be assigned a name by the user. To change the name of an axis, in the Axis Definitions Dialog, select an axis and click Rename.

Notice that the connectors on the front of the RMC70 labeled "Axis 0" or "Axis 1" do not necessarily have to belong to the internal Axis 0 or Axis 1 in the RMC70. The connectors on the RMC150 also do not necessarily indicate which internal axis they belong to.