Use of the Trend module in the Yokogawa VP system DCS

Thread Content

The Trend function, which is frequently used in DCS systems, can record various data collected by HIS, with the changes in these data being displayed on the trend chart. Trend charts can be used to monitor real-time parameters, retrieve historical parameters for analyzing the process operation, and more. Many production workers in factories can use the basic functions in trend charts proficiently, but many of the functions available in these charts do not receive much attention. This article provides an in-depth analysis of the functions and operation methods of the trend chart module in the Yokogawa VP system. The various functions in the toolbar can be used to perform different operations, such as zooming in and out on trend charts, marking parameters, etc. The specific functions and their operations are as follows: Trend pen assignment: This button opens a dialog box for specifying trend recording pens; in this dialog box, trend recording pens can be assigned to continuous trends, their display properties can be changed, and batch trend reference modes can be registered. Recording pen number: Press this button to display the recording pen number on the trend chart. When this button returns to the normal state, hide the record pen number. In the scaling mode, to select trend points that need to be displayed separately in the legend area, click on \"Trend point\", and a single-point trend chart similar to the one shown above will appear. Read Long-term Files: This button displays the data saved in the long-term data archive files. From the menu that appears when you click this button, select to open the dialog box for selecting archive files. After selecting a file, click this button and choose from the menu that appears to specify the time at which the reading should begin and the number of samples to be displayed. This button appears only when the long-term data archiving package is installed and a long-term data archiving period is set. Add trend points to both trend charts. This method of operation is relatively simple; it can be added directly from other trend charts.