3HAC
控制功用的选择
该选择包括运算功用、控制功用、通讯功用、编程功用、确诊功用和处理速度等特性的选择。
运算功用
简略PLC的运算功用包括逻辑运算、计时和计数功用；一般PLC的运算功用还包括数据移位、比较等运算功用；较杂乱运算功用有代数运算、数据传送等；大型PLC中还有仿照量的PID运算和其他高级运算功用。跟着开放系统的呈现，现在在PLC中都已具有通讯功用，有些产品具有与下位机的通讯，有些产品具有与同位机或上位机的通讯，有些产品还具有与工厂或企业网进行数据通讯的功用。规划选型时应从实践运用的要求启航，合理选用所需的运算功用。大多数运用场合，只需求逻辑运算和计时计数功用，有些运用需求数据传送和比较，当用于仿照量检测和控制时，才运用代数运算，数值变换和PID运算等。要闪现数据时需求译码和编码等运算。
控制功用
控制功用包括PID控制运算、前馈补偿控制运算、比值控制运算等，应根据控制要求断定。PLC首要用于次第逻辑控制，因而，大多数场合常选用单回路或多回路控制器处理仿照量的控制，有时也选用专用的智能输入输出单元完毕所需的控制功用，跋涉PLC的处理速度和节省存储器容量。例如选用PID控制单元、高速计数器、带速度补偿的仿照单元、ASC码变换单元等。
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