| 摘要 |
PURPOSE:To improve reliability by inputting and calculating status quantity of a controlled system to plural controlling device in parallel, exchanging the result in an information transmitting path, mutually diagnosing the result of calculation by majority logic and using controlling output which is judged as correct. CONSTITUTION:Plural controllers 10, 12, 14 are driven by an independent power source, and process data 34, 36, 38 from a controlled system 32 are inputted to controllers 10, 12, 14 through a sensor not shown in the figure and via separate lines l1-l3. Controllers 10, 12, 14 receive triplicated command information 40. Controllers 10, 12, 14 are mutually connected by information transmitting lines 16, 18, 20 and exchange the result of operation. Controllers 10, 12, 14 make controlling operation according to the command information 40 and process data 34, 36, 38. Further, they make mutual diagnosing with reference to exchanged information and determine optimum controlling quantities 22, 24, 26, and send them to a majority judging circuit 28, and control the controlled system 32 by a judged signal 30. In this way, highly reliable control can be performed. |
