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1 前言本文件所讨论的是对现场安装的智能化检测器和执行器之间互相连接用的工业现场总线的要求。下列全部或部分特点也许可用于区别“低级”现场总线与诸如PROWAY或MAP这种“高级”系统。a)在自动分级控制系统中,现场总线上的装置都是0级和1级装置。这些装置可能含有足够的智能(数字计算能力)来执行低级的功能,诸如简单的接点顺序或一种控制方程。通常这些装置不具备象制造厂或过程工厂区内多台装置间互相协调这样的高级功
1 Preface This document discusses the requirements for an industrial fieldbus interconnecting an on-site, smart detector and actuator. All or some of the following features may be useful in differentiating between “low level” fieldbus and “advanced” systems such as PROWAY or MAP. a) In the automatic grading system, the devices on the fieldbus are class 0 and class 1 devices. These devices may contain enough intelligence (digital computing power) to perform low-level functions, such as simple contact sequences or a governing equation. Often, these devices do not have the advanced capabilities of coordinating multiple devices in a manufacturing or process plant area