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老师,某一个采样的设备参数,今天某时的数据减去昨天某时的数据,差值展现到画面上,如何操作。举个例子,昨天晚上23:59,读到电表的总数是100,今天晚上23:59,读到电表的总数是130,今天用电数是130-100=30,我想在画面上展示这个30,应该如何操作?
可以在表中配置计算节点,选择统计值的时段差,画面中用设备数据点组件就能选到计算节点的值