| 摘要 |
<p>PURPOSE:To display a more convenient trend graph for plant operation by providing a reference pattern displaying position designating means and reference pattern displaying means. CONSTITUTION:Whether or not the designation of a displaying position is performed by a reference pattern displaying position designating means 21 is discriminated and, when the designation is not performed by the means 21, the leading edge of collected data is designated as the leading edge position of reference pattern data. When the designation is performed by the means 21, a reference pattern displaying means 22 inputs the position signal on a designated time base and calculates each time data so that the leading edge of a reference pattern can be brought to the designated position. In addition, the means 22 discriminates whether or not the reference pattern data are changed or not and, when the data are changed, erases the preceding reference pattern being displayed. When the data are not changed, the means 22 displays the reference pattern by using the designated displaying position as a starting point.</p> |
