直接数字控制器，Direct Digital Controller，也称“DDC控制器”。通常DDC系统的组成通常包括中央控制设备(集中控制电脑、彩色监视器、键盘、打印机、不间断电源、通讯接口等)、现场DDC控制器、通讯网络、以及相应的传感器、执行器、调节阀等元器件。
可编程控制器简称PC，但沿用PLC的简称。其英文全称为：Programmable Controller，它经历了可编程矩阵控制器PMC、可编程顺序控制器PSC、可编程逻辑控制器PLC（英文全称：Programmable Logic Controller）和可编程序控制器PC几个不同时期。
1987年国际电工委员会（International Electrical Committee）颁布的PLC标准草案中对PLC做了如下定义：“PLC是一种专门为在工业环境下应用而设计的数字运算操作的电子装置。它采用可以编制程序的存储器，用来在其内部存储执行逻辑运算、顺序运算、计时、计数和算术运算等操作的指令，并能通过数字式或模拟式的输入和输出，控制各种类型的机械或生产过程。PLC及其有关的外围设备都应该按易于与工业控制系统形成一个整体，易于扩展其功能的原则而设计。”
根据生产工艺规定的时间顺序或逻辑关系编制程序，对生产过程各阶段依次进行控制的装置，简称顺控器。顺序控制器的控制方式有时序控制和条件控制两种。
用数字技术和微电子技术实现闭环控制的调节器，又称数字调节仪表，是数字控制器的一种。它接受来自生产过程的测量信号，由内部的数字电路或微处理机作数字处理，按·定调节规律产生输出数字信号或模拟信号驱动执行器，完成对生产过程的闭环控制。
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