XV7715b

具备网络功能的PLC在这几年被炒起来， PLC目前多采用各式工业总线，如FoundationFieldbus、DeviceNet、C且也 Modbus、Ethernet、Profibus及串行端口等来提供连接。而PAC不 但作为分布式νo模块的中心，也可以扮演受控制者，成为现有系统的一部分，在以太网络的连接方面， PAC也比PLC要容易。

　　RT Linux、PharlapS、QNX以及VxWorks都是PAC上常见的实时操作系统，实时系统 一向难以用程序设置，目前市面仍以Linux、Windows CEo net、VxWorks为主，其中WindowsCEo net因为***为用户所熟悉，所以也***为普及，不过稳定性仍是一大障碍。Linux目前也开始 有多家厂商开始采用，至于VxWorks市面上则相当少见。实时控制系统开发工具虽然传统的梯式逻辑程序设计适合用于设计数字VO，但是在处理模拟vo、动作或视觉时可能略嫌笨拙。PAC可采用C与C+十来作为程序语言，值得注意的是NI的Lab VIEW R巳al- Time一类的软件 已经改变了工程师对于实时控制系统开发的看法。

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