TREND GRAPH DISPLAY APPARATUS

摘要

PURPOSE:To prevent the loss of data caused by the mistake of an operator by providing a trend data memory means and a display control means. CONSTITUTION:A trend-data memory device 8 collects the data displayed on a trend graph and the definition data concerned defined by trend data definition file 5 on the basis of the memory command due to the direct input to an input device 20 by an operator and the command from an event generator 19 and adds a comment thereto to store the collected data in a trend data memory file 9. When the trend graph is stored, a memory command is applied to the memory device 8 by the key operation on the input device 20 and the event generator 19 and the memory device 8 edits the trend graph data displayed on a CRT screen by a treand graph display control unit 7 to store the same in the file 9. A trend memory graph display device 10 displays the trend data and comment data stored in the file 9 on a CRT 11.