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.
出处
《微计算机信息》
北大核心
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
关键词
PLC
控制
通信
车库
PLC
Control
Communication
Garage
