（HP 5343A HP 5343A）

HP 5343A
HP 5343A
HP 5343A
1、主站：wincc5应该带有modbus通讯驱动，wincc6可以通过modbus opc server实现。从站：在s7200项目中添加modbus协议库（microwin帮助中有详细介绍）。主从站的通讯参数一致。
2、pc access其实就是一个s7 200 opc server（ppi），比采用modbus简单易用，由于采用ppi协议，plc项目中不必另嵌通讯处理程序。
3、pc/ppi电缆也可以用市售的rs232/485转换器代替。
WinCC与S7-200系列PLC通过PPI协议进行通信的实现。

PPI协议是西门子S7-200系列PLC常用通信协议，但WinCC中没有集成该协议，即WinCC不能直接监控S7-200系列PLC组成的控制系统。S7-200 OPC Server是西门子公司推出的专为解决上位机监控S7-200系列PLC控制系统的接口软件。因此，WinCC可以通过该软件与S7-200系列PLC很方便的建立通信。

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