| 摘要 |
<p>PURPOSE:To facilitate the reading of data values and to improve the accuracy of the data by setting a reference line for reading the data values at specified positions from trend graphs. CONSTITUTION:When process values are inputted into a display control means 2 from a plant, at first, input processing for the input data is performed in an input processing part 21. Then, the data are stored in a data storing part 22. The stored 22 data are processed in a display processing part 23 as trend graphs. The graphs are displayed on a CRT display 1. Then, the presence or absence of the display request for a reference line 8 is decided in a reference-line processing part 24. When it is decided that the display request is present, the reference line 8 is displayed on the screen of the CRT 1 with the processing part 24. When the reference line 8 is displayed on the CRT 1, the intersections of the reference line 8 and the trend graphs 4a -4c are detected with the processing part 24. The value of the data (a) - (c) at the times specified with the reference line 8 are displayed as digital values on data display parts 9a - 9c.</p> |
