| 摘要 |
PURPOSE:To display the state change of a plant without any error at all times, by making the data storage content of a computer coincident with that of a data exchange input and output device, in a plant monitor system including the data exchange input and output device. CONSTITUTION:State data of a plant 1 is fetched at a prescribed period and the state change of the plant is detected from the state data at present and in the past, and the preset state data detected for the state change is outputted by a data exchange input and output device 2. A computer 4 fetches the detection of changed bits with the state data at present and in the past and changes symbols on a display screen corresponding to a picture display device 6 displaying the state data as pictures. In a plant monitor system having the input and output device 2 and the computer 4, the state data in the past can be made coincident between the computer 1 and the input and output device 2 by providing the previous state data of the computer 1 to the input and output device 2. |
