一 问题的提出 用户程序包是推广应用程序的最好方法之一。关键问题是如何优化该设计,使其本身具备推广的意义。另外,过程控制机的用户程序,在其投运后是不会轻易改变的,为取得最大的经济效益,也要求它具有较高的质量。总之,这就要求用户程序包具有适应性强,可靠性高和效率高的特点。而这三个方面,恰恰也就是过去用户程序设计中存在的问题。我们同望 One of the issues raised by the user package is one of the best ways to promote an application. The key issue is how to optimize the design so that it has its own meaning of promotion. In addition, the process control machine user program, after it is put into operation will not be easily changed, in order to obtain maximum economic efficiency, but also requires it to have a higher quality. In short, this requires that the user package has the characteristics of adaptability, high reliability and high efficiency. And these three aspects, it is precisely the user program design problems in the past. We hope together