| 摘要 |
<p>PURPOSE:To instantaneously grasp the data of what position in a large screen buffer the data now being displayed is by providing a display screen with a window, and displaying the coordinate information in the large screen buffer of the display data and the coordinate of alarm data into said window. CONSTITUTION:An area 20 showing at what place in a whole large screen buffer 17 the data now being displayed on the display screen 7a of a CRT display device 7 is positioned is indicated in the window 13 by, for instance, an oblique line. Namely, in the window 13 provided on a part of the display screen 7a of the CRT display device 7, the area 20 to show to what position in the large screen buffer 17 each data now being displayed on the display screen 7a belongs is indicated by a relative position. Thus, an operator can decide instantaneously to what position among all the data sent from a plant the data now being displayed belongs.</p> |
