一种S7-226型PLC与PC机的通信方式的实现  

A Realization of free port communication between PLC S7-200 series and industrial computer

作　　者：周应兵[1] 王旭光[1] 赵永林[1] 

机构地区：[1]山东交通学院信息工程系,250023

出　　处：《微计算机信息》2005年第07S期24-25,2,共3页Control & Automation

基　　金：交通部"通达计划"资助项目

摘　　要：针对上、下位机之间信息交换量小的工业控制系统,设计了一种简单可靠的S7-200系列PLC与工控计算机通信的方法。采用自由口模式,上位机到下位机的信息分为查询和控制指令两类,下位机的应答信息可反映其工作状态、接收到的信息正确与否等情况。Considering the case that the information exchange between the industrial computer and PLC contains just a few bytes, while high reliability is requested, the authors design a simple and reliable communication program. Under the free port model, the information from industrial computer to PLC are divided to two kinds: one is inquiry information and the other is control command. The reply information from PLC contains the operating state of PLC and the correctness of the received data.

关 键 词：PLC 控制 通信 车库 

分 类 号：TN911[电子电信—通信与信息系统]