基于MODBUS-RTU协议的PLC多路数据采集系统  

MODBUS-RTU-based PLC Multi-communication and Control System

作　　者：舒凯[1] 

机构地区：[1]国网南京自动化研究院/南京南瑞集团公司,江苏省南京市210003

出　　处：《水电自动化与大坝监测》2008年第2期66-69,共4页HYDROPOWER AUTOMATION AND DAM MONITORING

摘　　要：介绍了MODBUS-RTU通信协议在RS-485总线中的通信方式,提出基于MODBUS-RTU通信的数据采集系统,分析了采用ADAM-5510E/TCP数据采集器的原因,阐述了RS-485总线信号的衰减、噪声干扰、浪涌干扰的解决方法,并结合工程说明了数据采集层、可编程逻辑控制器(PLC)控制与显示层、数据传输层的实现,以及系统总召/轮询传感器数据的程序设计思路。该系统已经过2个汛期的考验,运行稳定。The communication mode of MODBUS--RTU application protocol in RS-485 bus is introduced. A MODBUS-RTU protocol-based monitoring and control system is put forward. The reason for adopting ADAM--5510E/TCP is analyzed. The solution for attenuation, imitation malfunction and impulse signal control in RS-485 bus is expounded. With a project as an example, the realization of the data collection layer, PLC control, display layer and data transmission layer in the main control network is described in detail. The system has been tested in flood seasons and proved to be effective and stable.

关 键 词：MODBUS-RTU协议 可编程逻辑控制器 RS-232/RS-485接口 RS一485总线 ADAM-5510E/TCP 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]