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1.前言随着数字通讯技术的发展以及带微处理机的智能式传感器的普及,以称作现场总线(Fie1d Bus)的通信线连接传感器、执行器等现场仪表,以及设置在控制室内的分散型控制系统的现场传输问题,已成为过程控制中的主要议题之一.在上述背景下,目前国际上制订开放系统现场总线标准的动态十分活跃。为了把握这一发展动向,为今后的标准化作好准备,日本电气测量仪表工业协会现场总线动向调查工作组(WG)已于1987年5月开始工作。本文主要报道WG中所收集到的现场总
1. Introduction With the development of digital communication technology and the popularization of smart sensors with microprocessors, field instruments such as sensors and actuators are connected to a communication line called a field bus, and a decentralized set in a control room Type control system has become one of the main topics in process control.In the context of the above, the dynamics of establishing the open system fieldbus standard in the world are very active at present. In order to grasp this development trend and prepare for the standardization in the future, the Working Group of Fieldbus Trends Survey of Japan Electrical Measurement Instrumentation Industry Association (WG) started its work in May 1987. This article mainly reports the total site collected in the WG