| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep the balance of entire process plant by changing their own set values by plural control systems so as to increase an index expressing a satisfactory degree to be operated according to related measurement information in addition to measured information for controlling each control system. SOLUTION: A control system 1 fetches the output information of sensor 13 for sensing a flow rate, a control system 2 fetches the output information of sensor 15 for sensing a temperature, a control system 3 fetches the output information of sensor 16 for sensing pressure and a control system 4 fetches the output information of sensor 18 for sensing a liquid level respectively as the measured information for performing closed loop control. Further, the output information of all sensors 10-22 is fetched into a line concentration part 51 and this is transmitted through communication lines 52, 53, 54, 55 and 56 to the respective control systems 1-4. Then, the respective control systems 1-4 respectively operate the indexes expressing the satisfactory degrees according to a lot of measurement information and change their own set values so as to increase the indexes expressing the satisfactory degrees.</p> |
