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1、硬件连接
为了实现PLC与计算机之间的通信，西门子公司为用户提供了两种硬件连接方式：一种是通过PC/PPI
电缆直接连接，另一种是通过带有MPI电缆的通信处理器连接。
典型的单主机与PLC直接连接如图1所示，它不需要其他的硬件设备，方法是把PC/PPI电缆的PC端连
接到计算机的RS-232通信口（一般是COM1），把PC/PPI电缆的PPI端连接到PLC的RS-485通信口即可。
2、软件的安装
（1）系统要求
STEP7-Micro/WIN32软件安装包是基于Windows的应用软件，4.0版本的软件安装与运行需要
Windows2000/SP3或WindowsXP操作系统。
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