The trend curve can clearly depict the distribution trend of the field data over a period of time.Through the trend diagram,the operator can see the change of each quantity according to the change trend of the data at each field data collection point,and can view any historical moment.data for appropriate processing by field operators.
When realizing the real-time curve,the Trend Tags.vi provided by the DSC module is called.The input of this subVI is the tag(Tag)and the time length.The data range displayed on the X-axis and Y-axis can be realized by programming;When creating a curve,call Read Treace.vi provided by the DSC module,and you can view the data collected on-site at any historical moment through the Historical Trend control.By selecting different on-site collection points,the ranges of the X-axis and Y-axis also change accordingly.It is worth noting that the historical curve only shows the trend graph of the curve when the data change exceeds the set deviation.
趋势曲线能够形象清楚地描绘出现场数据在一段时间内的分布趋势，通过趋势图，操作员可以根据各个现场数据采集点的数据的变化趋势看出各个量的变化情况，而且能查看任何历史时刻的数据，供现场操作人员作出适当的处理。
在实现实时曲线时，调用了DSC模块提供的Trend Tags.vi，该子VI的输入为标签（Tag）和时间长度，可以通过编程来实现X轴、Y轴显示的数据范围的大小;实现历史曲线时，调用DSC模块提供的Read Treace.vi，通过Historical Trend控件可以查看任意历史时刻的现场采集的数据，通过选择不同的现场采集点，X轴、Y轴的量程范围也随之变化。值得注意的是，历史曲线只有在数据变化超过所设定的偏差时，才显示曲线的趋势图。
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