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一、概述随着现代化生产过程的发展和扩大,对过程仪表和过程仪表控制系统不断地提出新的要求,在这些新的要求当中有许多是模拟仪表所不能达到的,如像在一些比较复杂的过程控制中的前馈控制、大滞后调节、相关调节和计算值调节等都是模拟仪表难以完成的。另一方面由于生产规模的不断扩大使模拟仪表盘的长度不得不继续加长,这给人——机联系造成了巨大困难。模拟仪表在上述两个方面的问题虽然
I. INTRODUCTION With the development and expansion of modern production process, new requirements are constantly put forward for the control of process and process instrumentation. Many of these new requirements are beyond the reach of analog meters, as in some of the more complex The feedforward control in the process control, the big lag adjustment, the correlation adjustment and the calculation value adjustment and so on are all difficult to finish by the simulation instrument. On the other hand, due to the continuous expansion of the production scale, the length of the simulated dashboard has to be lengthened, which brings great difficulties to the human-machine connection. Although the problem of simulating the above two aspects of the instrument