把PC连入PLC应用系统是为了向用户提供诸如工艺流程图显示、动态数据画面显示、报表编制、趋势图生成、窗口技术以及生产管理等多种功能,为PLC应用系统提供良好、物美**的人机界面。但这对用户的要求较高,用户必须做较多的开发工作,才能实现PC与PLC的通信。
为了实现PC与PLC的通信,用户应当做如下工作:
1)判别PC上配置的通信口是否与要连入的PLC匹配,若不匹配,则增加通信模板。
2)要清楚PLC的通信协议,按照协议的规定及帧格式编写PC的通信程序。PLC中配有通信机制,一般不需用户编程。若PLC厂家有PLC与PC的**通信软件出售,则此项任务较容易完成。
3)选择适当的操作系统提供的软件平台,利用与PLC交换的数据编制用户要求的画面。
4)若要远程传送,可通过Modem接入电话网。若要PC具有编程功能,应配置编程软件。
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