(under subclass 600) Subject matter in which a counting means acts as the comparator between the command signal and the position signal.
(1) Note. For example: If the member is to be positioned a certain increment from its present position, the command signal introduces a count into the counting means which is proportional to the distance to be moved, an error signal is generated which causes the member to move toward its final position, a feedback position indicator causes the counting-means to count back toward zero; and upon reaching zero the member is properly positioned, the error signal is no longer generated and the system waits for the next command.
SEE OR SEARCH CLASS
377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for pulse counting circuits.
