MVME51005E-0161

MVME51005E-0161

MVME51005E-0161

PLC中无非就是三大量：开关量、模拟量、脉冲量。搞清楚三者之间的关系，你就能熟练的掌握PLC了。

1、 开关量也称逻辑量，指仅有两个取值，0或1、ON或OFF。它是常用的控制，对它进行控制是PLC的优势，也是PLC基本的应用。

开关量控制的目的是，根据开关量的当前输入组合与历史的输入顺序，使PLC产生相应的开关量输出，以使系统能按的顺序工作。所以，有时也称其为顺序控制。

而顺序控制又分为手动、半自动或自动。而采用的控制原则有分散、集中与混合控制三种。

MVME51005E-0161 

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1-Year Emergent Systems Exchange Warranty

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