Do position errors accumulate with continuous “relative travel”?
The smallest unit of movement of any positioning system is the increment. If it possible to transfer the setpoint position to the controller directly in increments, there is no cumulative error when using relative positioning. If the positioning controller receives the setpoint position as a feed constant calculated by the user, the rounding error results in most cases in a cumulative error. Positioning errors can also add up if movements relative to the last actual position are repeatedly made. Therefore, on the SEC-AC Festo provides the option of moving relative to the last target position.
