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一、前言在过程控制领域里,依靠计算机控制技术、数据通信技术、CRT人机接口技术和微处理器的有效利用而获得迅速发展和普及的分散型控制系统,在开始取代以继电器控制装置和模拟调节器等为中心的盘装仪表系统方面,已经有五年多的历史。无论从哪一方面讲,最初的分散型系统都是根据用户的需要和半导体电路技术的迅速发展,首先由生产厂设计制造出其原始型态,然后根据在实用过程中所取得的经验,经过进一
I. INTRODUCTION In the field of process control, a decentralized control system that has been rapidly developed and popularized relying on effective use of computer control technology, data communication technology, CRT human-machine interface technology and microprocessors has started to replace the traditional control system with relay control devices and Analog regulator, etc. as the center of the disk instrument system, there have been more than five years of history. In either case, the initial decentralized system was based on the needs of users and the rapid development of semiconductor circuit technology, first designed by the manufacturer to produce its original form and then based on experience gained in practical applications Enter one