The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2013
Filed:
Sep. 29, 2008
Akira Nagashima, Tokyo, JP;
Tetsuya Ohtani, Tokyo, JP;
Ryutaro Okano, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A network control system for packet-transmitting a manipulated variable (MV), calculated from a deviation between a variable from a sensor measuring a physical quantity of a controlled object plant and a set value at a known sampling period, to an actuator provided on the plant side via a network, and causing the actuator to provide the MV to the plant. The system includes: an MV complementing unit that provides a complementary value of the MV to the actuator when an error occurs in a packet transmission; an MV buffering unit that answers back trend data of the MV provided to the plant from the actuator or the complementary value being complemented by the MV compensating unit for the actuator, to the controller via the network; and an MV compensating unit that corrects a calculation of the MV of the controller based on the trend data or the complementary value being answered.