| 摘要 |
PURPOSE:To obtain a high-performance dual control circuit by discriminating between the trouble of a control in operation and that in stand-by mode in a closed loop system, and displaying the trouble of the controller in stand-by mode. CONSTITUTION:The controller 1 in operation and controller 2 in stand-by mode which both operate through setters 4, etc., control a controlled system 12 through a switch 3, and their outputs are inputted to substracters 5 through a sensor 14 respectively. Further, models 15-20 corresponding to actual equipments constitute norm models having the same dynamic characteristics. Respective signals from the models are compared 22-25 with signals from the actual equipments to input deviation values 26-29 to the 1st decision making device 30, and the comparison output 33 between the controllers 1 and 2 is inputted to the 2nd decision making device 34. If the controller 1 in operation gets out of order, the switch 3 performs switching to the controller 2 in stand-by state with the output of the 1st AND circuit 36, and if the controller 2 in stand-by mode gets out of order, the trouble is displayed with the output of the 2nd AND circuit 38. |
