| 摘要 |
PURPOSE:To detect a malfunction by storing an input signal and an output signal of a controller at the current time and comparing an expected control output value on these conditions with the control output of the controller. CONSTITUTION:An input signal 10 from a device to be controlled is stored in an input storage device 1, and an output signal 11 is inputted to a controller 2 and one input of an expected output device 5. A control output 20 is read into an output device 3 by an output command 22 of the controller 2 and is read into the control output of the device to be controllled and an output storage device 4 as an output signal 30. An output storage signal 40 is inputted to the other input of the expected output device 5, and an expected output signal 50 is outputted by the input storage signal 11. The expected output device 5 outputs an expected value of the control output signal 20 which the controller operates and outputs by the input storage signal 11. An output decision device 6 compares the output signal and the expected output signal 50 with each other at the timing of the output command, and if they do not coincide with each other, the malfunction of the controller 2 is detected. |
