Patent ID: 6243610
Filing Date: 2001-06-05
Classification: G05B

Abstract:
A network control system for transmitting signal between a control apparatus and a controlled object,said control apparatus comprising:a process signal receiving device for receiving a process signal outputted from the controlled object, the process signal includes a time information related to an observed process variable;a control variable calculating device for calculating a control variable for a process in the controlled object based on the process signal; and,a control signal outputting device for outputting a control signal including the calculated control variable and a detection time of the process variable to the controlled object; andsaid controlled object comprising:a control signal inputting device for receiving the control signal that is outputted from said control apparatus;a driver for driving a process of said controlled object based on the control variable included in the control signal;a detector for detecting the process variable of the process thus driven;a time measuring device for measuring a detection time of the process variable and reception time of the control signal; anda process signal outputting device for outputting the process signal including the detected process variable and the measured process variable detection time to said control apparatus, whereinsaid control signal inputting device further calculates a transmission delay that is a difference between the control signal reception time and the process variable detection time that is included in the control signal, corrects the control variable by processing in accordance with the transmission delay, and outputs a corrected control variable to said driver.