Coordinated Motion Terminology
| Term | Definition |
|---|---|
| ACS | Axes Coordinate System. The system of coordinates related to the physical motors and the single movements caused by the single drives. |
| Blending | A way that consecutive function blocks cooperate in the transition from the first to the next. |
| Contour Curve | Inserted curve that modifies the original path. It is the resulting curve after blending |
| Coordinate system | The reference system in which a coordinate or path is described |
| Corner deviation | The shortest distance between the programmed corner point and the contour curve |
| Corner distance | Distance of the start point of the contour curve to the programmed target point. |
| Direction | The orientation components of a vector in space. (Note: this is different from the MC_Direction input as used in part 1). |
| Drive | A unit controlling a motor via the current and timing in its coils |
| Group-FB | The set of function blocks that can work on a group of axes |
| MCS |
Machine Coordinate System. The system of coordinates that is related to the machine. A Cartesian coordinate system with the origin in a fixed position relative to the machine (the origin is defined during the machine setup). Sometimes called “World Coordinate System” or “Base Coordinate System”. (Note: with Cartesian build machines, MCS is a Cartesian Coordinate system and may be identical to ACS, or mapped via a trivial transformation). The coordinate system from the physical multiple axes ACS is linked to the MCS via a kinematic transformation (forward and backward conversion). The MCS represents an imaginable space with up to 6 dimensions. |
| Motor | An actuator A mechanical device for moving or controlling a mechanism or system. An actuator typically is a mechanical device which transforms an input signal (usually an electrical signal) into motion focused to a movement, converting electrical energy in a force or torque Torque is the tendency of a force to rotate an object about an axis. Just as a force is a push or a pull, a torque can be thought of as a twist. |
| Orientation | The rotational components of a vector in space. |
| Path | Set of continuous positions and orientation information in multi-dimensional space Geometrical description of a space curve that the TCP of an axesgroup moves along. |
| PathData | Description of a path which can include additional information like velocity and acceleration. |
| PCS | Product Coordinate System or
Program Coordinate System.
The PCS is based on the MCS typically by shifting and maybe rotating the MCS. The Zero
point of the PCS is related to the product and can be changed during runtime In computer science, runtime (or run-time) describes the operation of a computer program, the duration of its execution, from beginning to termination (compare compile time).
Within KAS, runtime also refers to the virtual machine that manage the program written in a computer language while it is running by the program.
The real work piece can have a rotation or shift to the MCS coordinate system or even might
be moving relative to the MCS coordinate system. By specifying a trajectory in PCS one is
able to describe the trajectory independent from the machine situation. To map these two
worlds (MCS to PCS and vice versa), a Cartesian or cylindrical transformation is normally
done. |
| Position |
Position means a point in space which is described by different coordinates. Depending on the used system and transformation it can consist of up to 6 dimensions (coordinates) meaning 3 Cartesian coordinates in space and 3 coordinates for the orientation. In ACS there can be even more than 6 coordinates. If the same position is described in different coordinate systems the values of the coordinates are different. |
| Scara | A special kinematic for robot or handling applications. |
| Speed | Speed is the absolute value of the velocity without direction. |
| Synchronization | Combines an axis or axes group (as slave) with an axis as master in order that the slave executes its path with synchronization to the progress of the master, meaning linked to a one dimension source for synchronization. |
| TCP | Tool Center point, the point in the machine that is commanded to move, typically the center or the head of the tool. It can be described in different coordinate systems. |
| Tracking |
Is characterized by an axis group that follows with its movement the movement of another axis group. |
| Trajectory | Time dependent description of the path the TCP of an axes group moves along.
Additionally to the geometrical description of the space curve, time dependent state variables
like velocity, acceleration, jerk In physics, jerk is the rate of change of acceleration; more precisely, the derivative of acceleration with respect to time, forces etc. are specified. |
| Velocity |
For a group of axes this means:
|
