1962年帝国化学工业公司和孟山都公司开始将直接数字控制(DDC)方法在工厂进行实验。在过程控制中采用该方法,计算机计算一个实际阀位,比改变模拟控制器的给定值要好。在短短的年月里,DDC 发展很快,引起了用户与制造厂家非常大的兴趣。为此,新近特别生产了一种小型、快速、可靠性高、价廉的全新的计算机系列。但是,由于该领域仍相当年轻,DDC 控制的方法,还有许多要讨论和争议的地方,其中,重要的争议之一是关于“控制算法”或模拟控制器规律的数字表示问题。当 In 1962, Imperial Chemical Industries and Monsanto began experimenting with direct digital control (DDC) methods in the factory. Using this method in process control, the computer calculates an actual valve position better than changing the analog controller’s setpoint. In a short period of time, DDC developed rapidly, aroused great interest of users and manufacturers. To this end, recently produced a special small, fast, reliable, inexpensive new computer series. However, since the field is still quite young, there are many areas for DDC control that need to be discussed and debated. One of the important issues is the question of digital representation of “control algorithms” or the law of analog controllers. when