Motion controller with remote linking

Patent 5689161 Issued on November 18, 1997. Estimated Expiration Date:

December 9, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Patent #: 5361260
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Motion controller with remote linking Patent #: 5463296
Issued on: 10/31/1995
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Inventors

Assignee

Allen-Bradley Company, Inc.

Application

No. 763450 filed on 12/09/1996

US Classes:

318/563, With protective or reliability increasing features (e.g., "fail-safe" systems)318/49, Motors electrically connected in cascade or tandem318/625Plural servomotors

Examiners

Primary: Sircus, Brian

Attorney, Agent or Firm

Baxter; Keith M., Miller; John M., Horn; John J.

International Class

G05B 019/10

Abstract

Multiple motion controllers for controlling servo motors are connected by a digital communications link so that controlled axes of the motion controllers may be slaved together regardless of their physical proximity. A given controller broadcasts position or command signals on the communications link in response to a request report message from any other controller. A second request report message may stop the broadcasting to conserve link capacity. Time shifting implicit in the link messages is corrected by estimating the velocity of the master axis and extrapolating the position to the local axes' time of updating.