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US 2011/0044331 A1Published application
Network control system
AssigneeYokogawa Electric Corporation
InventorsAkira Nagashima, Tetsuya Ohtani, Ryutaro Okano
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AssigneeYokogawa Electric Corporation
InventorsAkira Nagashima, Tetsuya Ohtani, Ryutaro Okano
Estimating the term…
A network control system enabling stable plant control thanks to controller compensation made in view of a packet loss. In the network control system, the amount of operation of a controller for computing the difference between the controlled variable from a sensor for measuring a physical quantity of a controlled plant and a target value is transmitted by means of a packet through a network to an actuator provided in the controlled plant, and the actuator inputs the amount of operation into the controlled plant. The network control system comprises MV complementing means for giving the actuator a complement value of the amount of operation if a packet transmission error occurs, MV buffer means for back-answering trend data on the inputted amount of operation or the complement value given to the actuator through the network to the controller, and MV compensating means for correcting the calculation of the amount of operation of the controller according to the back-answered trend data or complement value.
A network control system for packet-transmitting a manipulated variable of a controller, which is calculated based on a deviation between a processed variable from a sensor that measures a physical quantity of a controlled object plant and a set value at a predetermined sampling period, to an actuator provided on the controlled object plant side via a network, and causing the actuator to provide the manipulated variable to the controlled object plant, the network control system comprising:
Dependencies are inferred from the claim text.