Modbus RTU通信在CP340系统上的实现  

Realization of Modbus RTU Communication on CP340 System

作　　者：蒋天伟[1] 赵京涛[2] 

机构地区：[1]河北工业大学,天津300130 [2]廊坊师范学院,河北廊坊065001

出　　处：《通信技术》2010年第8期253-254,257,共3页Communications Technology

摘　　要：S7—300/400PLC在工业控制领域应用较为广泛,基于S7—300/400PLC的ModbusRTU协议通信数据采集一般采用CP341模块配置Dongle的模式实现,系统构建成本较高。采用CP340模块配比常州维格TCPC协议装换模块,并利用ModbusASCII协议,通过编程实现了面向ModbusRTU远程终端的协议通信,在S7—300/400PLC在工业控制应用中具有一定的应用价值。S7-300/400 PLC is wildly applied in industrial measurement and control fields. The date acquisition based on Modbus RTU protocol is usually realized by CP341 module configurated with Dongle, and however, this is fairly expensive. So CP340 module with TCPC-based Modbus ASCII protocol is adopted, and the Modbus RTU remote terminal-oriented communication is thus realized by programming. This technology is of certain value for S7-300/400PLC in industrial measurement and control application.

关 键 词：Modbus—RTU Modbus—ASCII CP340 传输控制与协议转换 

分 类 号：TN915.04[电子电信—通信与信息系统]