A-33
Appendices
NJ/NX-series CPU Unit Motion Control User’s Manual (W507)
A-6 Terminology
A
A-6-2 Motion Control
A-6-2 Motion Control
Term Description
used real axis Axis of which axis type is set to Servo Axis or Encoder Axis and axis use is set to
Used Axis.
used virtual axis Axis of which axis type is set to Virtual Servo Axis or Virtual Encoder Axis and axis
use is set to Used Axis.
Motion Control Function Module A software component that executes motion control. It performs motion control
based on commands from the motion control instructions that are executed in the
user program. (Abbreviation: MC Function Module)
motion control instruction An instruction that is defined as a function block to execute a motion control function.
The MC Function Module supports instructions that are based on function blocks for
PLCopen
®
motion control as well as instructions developed specifically for the MC
Function Module.
motion control axes Axes for which all motion control functions can be used.
single-axis position control axes Axes for which only single-axis position control can be used.
single-axis position control Controlling the position of one axis.
single-axis velocity control Controlling the velocity of one axis.
For single-axis velocity control, the MC Function Module sometimes outputs velocity
commands to the Servo Drive and sometimes outputs position commands to the
Servo Drive.
single-axis torque control Controlling the torque of one axis.
single-axis synchronized control Synchronizing the control of one slave axis with one master axis.
There are two types of single-axis synchronized control: gear operation, in which the
axes are synchronized with a gear ratio, and cam operation, in which the axes are
synchronized according to the relationship between phases and displacements in a
cam table.
single-axis manual operation Controlling an axis with manual operation, such as jogging.
auxiliary functions for single-axis
control
Functions that aid in controlling an axis, such as override factor settings and reset-
ting errors.
multi-axes coordinated control Controlling the motion of more than one axis, such as linear interpolation and circular
interpolation.
You specify an axes group to specify the axes to coordinate.
auxiliary functions for multi-axes
coordinated control
Functions that aid in controlling an axes group, such as override factor settings and
resetting errors.
motion control parameters Parameters that define the operation of the MC Function Module.
The motion control parameters include the MC common parameters, axis parame-
ters, and axes group parameters.
axis parameters Parameters that apply to a single axis.
axes group parameters Parameters that apply to an axes group.
system-defined variables for motion
control
System-defined variables that provide status information for the MC Function Mod-
ule.
The system-defined variables for motion control include the MC Common Variable,
Axis Variables, and Axes Group Variables.
MC common variable A system-defined variable that is defined as a structure and provides status informa-
tion for the overall operation of the MC Function Module.
axis variables System-defined variables that are defined as structures and provide status informa-
tion and some of the axis parameters for individual axes.
axes group variables System-defined variables that are defined as structures and provide status informa-
tion and some of the axes group parameters for individual axes groups.
homing The process of defining home.
Homing is also called home positioning, home searching, calibration, and datum.
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