更新时间: 2025-03-11
用PLC进行数据采集一般有两种方法:一是定时采集,就是按照采样时间,分别采集被控对象的数据,并存入数据区。二是变化采集,即跟踪被采集量,视其变化情况,若变化值超过使用它的精度,则采集,并同时记下采集时间。如果被采集的量变化不大,用变化采集可节省数据区。在储运罐区系统中,对于现场模拟量信号的采集采用的是定时采集,每500ms为一个采集周期,如图(2)为其中一路模拟量信号的定时采集的梯形图。这里的T0.1为定时器,每500ms把30001通道(要采集数据的通道)的内容存于以40020为指针的数据区中,存后指针加1,指针加1后再判断指针是否超出数据范围,若超,则把00000再赋给指针,既令其再从存储区开始处存数PP7900 Inverter Board Strainer Meyer 26.37.05A2
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