DCS系统备件6DD1641-0AC0 西门子
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DCS系统备件6DD1645-0AE1 西门子
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DCS系统备件6DD1648-0AB0 西门子
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DCS系统备件6DD1660-0AD0 西门子
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SIMEMENS 6DD1640-0AH0
实际的物理量，除了开关量、模拟量，还有运动控制。如机床部件的位移，常以数字量表示。
运动控制，***办法是NC，即数字控制技术。这是50年代诞生于美国的基于计算机的控制技术。当今已很普及，并也很完善。目前，***国家的金属切削机床，数控化的比率已超过40％～80％，有的甚至更高。
PLC也是基于计算机的技术，并日益完善。故它也完全可以用于数字量控制。
PLC可接收计数脉冲，频率可高达几k到几十k赫兹。可用多种方式接收这脉冲，还可多路接收。有的PLC还有脉冲输出功能，脉冲频率也可达几十k。有了这两种功能，加上PLC有数据处理及运算能力，若再配备相应的传感器（如旋转编码器）或脉冲伺服装置（如环形分配器、功放、步进电机），则完全可以依NC的原理实现种种控制。
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