基于CP341模块的MODBUS RTU免授权通讯的实现与应用

Implementation and Application of MODBUS RTU Unlicensed Communication Based on CP341 Module

根据实际项目介绍了一种基于RS485接口的西门子CP341通讯模块的MODBUS RTU通讯设计方案,在这种方案中详细讨论了通过使用集成在CP341内的ASCⅡDriver通讯协议来实现MODBUS RTU协议,并且通过采用在西门子STEP7中软件编程的方式实现MODBUS RTU免授权通信。该方案不再需要使用MODBUS协议驱动模块,节省开销。实际应用结果表明,这种通讯方式不仅成本低廉而且安全可靠、使用方便,具有广泛的应用价值,值得推广。

A communications design based on Siemens CP341module MODBUS RTU was described,Theproposal was discussed which used ASCⅡdriver communication protocols integrated within the CP341to enableMODBUS RTU protocol,and MODBUS RTU unlicensed communications were achieved by using Siemens STEP7software programming way in detail.The program did not require the use of MODBUS protocol driver module,overhead was saved,application of the project results show that this communication is reliable,cheap cost and easy touse,and has wide application value.