| 摘要 |
PURPOSE:To prevent malfunction or destruction of a controlled device by using a timer circuit to set optionally a time until a controller generates an analog control signal at each output unit and interrupts it so as to allow the controller to use a deviation detector thereby taking an erroneous output value as a mean value of normal output value. CONSTITUTION:Analog control signals E1-E3 are inputted respectively to operational amplifiers 111, 121, 131 of output units 11-13 of the controller, limit resistors 113, 123, 133 of the output side limit an output current and the result is outputted to a wired OR circuit 15 via relay switches 112, 122, 132. The deviation detectors 114, 124, 134 detect deviation voltages DELTAE1-DELTAE3 by using voltages E1'-E3', ES across the resistors 113, 123, 133. The output proportional to the deviation voltages DELTAE1-DELTAE3 detected by the detectors 114, 124, 134 is fed to timer circuits 115, 125, 135, and the deviation voltages DELTAE1-DELTAE3 control the switches 112, 122, 132 according to the time from the generation of an analog control signal to its disconnection so as to use an erroneous output value to a mean value of the normal output. |
