Ask Configurator to query reports and trend curves by time

For the real-time trend curve, you can directly see how the data is currently changing.

ConfigKing provides three forms of historical trend curves:

The first is to call the historical trend curve that has defined the button of each function from the gallery, for this historical trend curve, the user only needs to define a few related variables, and appropriately adjust the appearance of the curve to complete the complex function of the historical trend curve, which is simple and convenient to use; The curve control can draw up to 8 curves, but this curve cannot be printed.

The second is to call the historical trend curve control, for this kind of historical trend curve, it is very powerful and relatively simple to use. Through this control, not only can the curve drawing of the historical data of the configuration king be realized, but also the curve drawing of the historical data in the industrial library, the curve drawing of the recorded data in the ODBC database, and in the running state, it can realize the dynamic increase and deletion of the curve, the stepless scaling of the curve chart, the dynamic comparison of the curve, the printing of the curve and so on.

The third is to call the historical trend curve from the toolbox, for this historical trend curve, the user needs to define the various operation buttons of the curve, that is, to establish a command language connection to operate the historical curve, for this form, the user has strong autonomy when using, and can make a personalized historical trend curve; This curve control can draw up to 8 curves, and this curve cannot implement the curve printing function.

For the first two is easy, you can try it yourself and there will be no problem, and the third one needs to define a key function to query.

If you want a report that automatically queries historical data on a regular basis, instead of popping up a dialog box, or the format of the historical report is fixed, and the queried data needs to be added to the fixed **, and the redundant query data does not need to be added to the table, then you can use the functions reportsethistdata, reportsethistdata3 or reportsethistdataex. When you use these functions, you need to specify the start time of the query, the query interval, and the range of the variable data.

Use of the Numeric Axis Indicator: You can zoom in or out by dragging the Numeric Axis (Y-axis) indicator to zoom in or out of the length of the curve in the y-axis direction, which is generally marked as a percentage of the range of the variable in the current chart.

Use of Timeline Indicator: The time string obtained by the Timeline Indicator is displayed at the top of the Time Indicator, as shown in Figure B. The timeline indicator can be used in conjunction with functions, etc., to obtain data at a certain point in time on the curve.