Relying on advanced industrial network technology can quickly and effectively collect,transmit production and management data.Therefore,the importance of the network in the automation system integration project is becoming more and more obvious,and some people even put forward the view that”the network is the controller”.
PLC has the function of communication and networking,which enables the exchange of information between PLC and PLC,between PLC and upper computer and other intelligent devices to form a unified whole and realize decentralized centralized control.Most PLCs have an RS-232 interface,and some have built-in interfaces that support their respective communication protocols.
The communication of PLC has not yet achieved interoperability.IEC stipulates a variety of field bus standards,which are adopted by all PLC manufacturers.
依靠先进的工业网络技术可以迅速有效地收集、传送生产和管理数据。因此,网络在自动化系统集成工程中的重要性越来越显著,甚至有人提出”网络就是控制器”的观点说法。
PLC具有通信联网的功能,它使PLC与PLC之间、PLC与上位计算机以及其他智能设备之间能够交换信息,形成一个统一的整体,实现分散集中控制。多数PLC具有RS-232接口,还有一些内置有支持各自通信协议的接口。
PLC的通信,还未实现互操作性,IEC规定了多种现场总线标准,PLC各厂家均有采用。
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