SERVO SYSTEM HAVING HIGH RESOLUTION D/A

摘要

A numerical control system for moving a controlled member along a given axis includes a digital to analog converter and a logic circuit to increase the resolution of the digital to analog converter. The logic circuit subdivides adjacent counts retained in the logic circuit by varying the amount of time during which the respective counts are directed to the digital to analog converter. The counts retained in the logic circuit differ by a fixed amount, and the magnitude of these counts is dependent upon the input pulse frequency applied to the logic circuit.