The MoveDone signal is a very reliable method of ensuring that a move is complete. It will be asserted (pulled low) when the axis has been within a configurable accuracy window for a configurable number of milliseconds after the end of the move. Typically, the accuracy window is set to a few encoder counts and the time qualifier to a few milliseconds. The SST servo drive checks for the end of move every 100 uS to eliminate delays and improve throughput in your machine.
The MoveDone signal also has built-in false trigger suppression (using fuzzy logic technology), that delays the assertion of the signal if the trajectory appears to be imminently leaving the accuracy window even though the time qualifier has been met.
This proprietary feature of the SST servo drive allows you to increase system reliability within your machine by giving your controller a highly reliable signal that can be used to interlock operations within the machine. MoveDone also usually eliminates the need to run high-speed, "raw" encoder feedback back to the host CPU. This single, "smart" signal supplies the high-level information the controller may desire. This improves system reliability and EMI/EMC problems (which also makes CE certification easier).
The MoveDone feature (together with the RAS, Hard Stop Homing, Limit Switch Homing, Torque Fold-back modes and flexible input resolution) helps enable the use of low-cost controls that lack encoder feedback, even in machines that require state-of-the-art performance.