1983年首钢烧结厂引进美国贝利公司的“网络-90系统”(NETWORK-90),简称“N-90”。经过一年多的时间的运行证明,像N-90这类微处理机控制系统比较适用于工业中的过程控制。特别是N-90的通信网络更是别具一格。通信效率高,误码率低。现场工作人员对此反映较好,值得我国通信网络设计人员研究和参考。 一、N-90的通信网络的特点 1.分级通信 N-90的通信网络分成两级: (1)现场的过程控制单元(PCU)内部各模件之间的通信通过模件总线。 所有模件的信息经总线串行输入、输出, In 1983, Shougang Sintering Plant introduced NETWORK-90 (abbreviated as “N-90”) from American Bailey Company. After more than a year’s operation proved that such a microprocessor control system as N-90 is more suitable for industrial process control. In particular, N-90’s communication network is unique. High communication efficiency, low bit error rate. Field staff reflect this better, it is worth our country communication network designer research and reference. First, the characteristics of the N-90 communication network 1. hierarchical communication N-90 communication network is divided into two levels: (1) on-site process control unit (PCU) communication between the various modules through the module bus. All modules of the information via the bus serial input, output,