基于Modbus协议的PLC与单片机的多机通讯

Multi-SCMs Communication for PLC Based on Modbus Protocol

通过设计了单片机硬件电路,扩展了RS485通讯能力,实现了与S7-200的Modbus协议多机通讯功能,在工业应用中具有良好的实用价值。

This paper extends RS485 communication ability via Single-Chip Microcomputer(SCM) circuit design.The communication among S7-200 PLC and Single-Chip Microcomputers is realized,and the method above is extremely valuable in industrial application.