描述
系统内部的传感器和执行机构,都可能用通信的方式与PLC交换信息。随着它们智能化程度的提高,这种方式也日益增多。
系统内部的人机对话装置与PLC交换信息,也就是本文重点介绍的PLC-GOT系统。而且在必要时,可能同时配备多个GOT同时工作。这些都完全依靠直接或间接地通信来完成。
PLC系统与它的上位机之间的通信。应用实践表明:分布式控制系统可以综合计算机和PLC的长处,弥补它们各自功能上的不足,实现控制与管理一体化。这种分布式控制系统在工厂自动化(FA)、柔性制造系统(FMS)以及计算机集成制造系统(CIMS)中可以发挥重要的作用。
有的实时控制系统,由于其重要性而备有“冗余系统”。一旦系统发生故障,处于热备用状态的相同系统将会立即接管原来的控制任务,确保安全。这其中通信工作起了不可替代的作用。
在功能相近、距离不远但又相对独立的、数个同序列的PLC小系统之间,可能构建N:N的简易通信。可以设定其中之一为主机,其他为从机。每一台机器都有自己的编号,交换数量有限的数据。
两台并联运行,构成1:1的模式,可以共享被指定的部分信息,操作十分简单。
简单固定信息的无协议通信。例如系统与它的打印机、条码扫描机或个人计算机之间的通信。
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