Multiplexing rate generator/counter circuit for controlling step

Details Multiplexing rate generator/counter circuit for controlling step Multiplexing rate generator/counter circuit for controlling step

1997-09-22

1998-12-22

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Time-sharing or multiplexing systems

318685, G05B 1332

Patent

active

058523545

ABSTRACT:
A multiplexing circuit which rapidly shares a single rate generator among up to 16 different motors. The circuit utilizes an addend memory block with n-bit by m-deep memory structures. Each memory address represents a particular stepper motor in the system. An axis scanning state machine 9 drives the memory structure address lines in a circuitous manner. At each memory address visit, the state of the circuit is re-established based on information stored from the last visit. The addition operation is performed to change the accumulator value in memory block 102. Any possible edge event is noted by edge detector 11. An edge produces a step and position monitor count. The axis-scanning state machine then moves on to the next address representing the next motor. The axis-scanning memory address influences memory structures throughout the device including accumulator value in memory block 102, addend memory values 12, device configuration 13, and step monitor counter 14. The complete axis-scanning cycle frequency of N Hz supports step rates of N Hz.

REFERENCES:
patent: 4055786 (1977-10-01), DiMazio
patent: 4734847 (1988-03-01), Hunter
patent: 5237250 (1993-08-01), Zeile et al.

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