Analog control
In the industrial production process,there are many continuously changing quantities,such as temperature,pressure,flow,liquid level and speed,which are all analog quantities.In order to make PLC process analog quantity,A/D conversion and D/A conversion between analog quantity and digital quantity must be realized.PLC manufacturers all produce matching A/D and D/A conversion modules,so that PLC can be used for analog control.
模拟量控制
在工业生产过程当中,有许多连续变化的量,如温度、压力、流量、液位和速度等都是模拟量。为了使PLC处理模拟量,必须实现模拟量和数字量之间的A/D转换及D/A转换。PLC厂家都生产配套的A/D和D/A转换模块,使PLC用于模拟量控制。
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