| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a trend graph display device capable of recognizing the state change of a plant in an optional time band and a state different from the normal one, smoothly operating the plant and being the guide of an operation corresponding to the state change. <P>SOLUTION: Signals transmitted to a controller 201 are received by a signal input function 111 and time-sequentially preserved in the trend data file 121 in a fixed cycle by a trend data filing function 112. When two pieces of the time (start time and end time) are inputted through an input device 103, data required for display are taken out from the trend data file 121 and the change amount of measured values at the two pieces of the time and an integrated value between the two pieces of the time for the measured value are displayed at a display device 102. <P>COPYRIGHT: (C)2004,JPO</p> |
