描述
PLC一般应用在小型自控场所，比如设备的控制或少量的模拟量的控制及联锁，而大型的应用一般都是DCS。当然，这个概念不太准确，但很直观，习惯上我们把大于600点的系统称为DCS，小于这个规模叫做PLC。我们的热泵及QCS、横向产品配套的控制系统一般就是称为PLC。
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