基于Modbus现场总线的电动机运行监控网络研究

Research on Motor Operation Monitoring Network Based on Modbus Fieldbus

针对传统变频调速系统中开关量和模拟量控制方式抗干扰性差、不宜远程控制以及多电机同时监控很难实现等问题,通过Modbus现场总线研究将西门子S7-1200、HMI和G120变频器连接起来组成异步电动机变频调速监控网络。研究内容包括控制系统硬件构成、变频器参数设置和PLC控制程序设计。该控制系统成本相对较低,能实现电动机的无级调速,可远程实时监控,值得推广。

To solve the problems of poor anti-interference of switch and analog control methods in traditional variable frequency speed regulation system unsuitable for remote control and difficult to monitor multiple motors,Siemens S7-1200,HMI and G120 frequency converters were connected to form the frequency conversion speed regulation monitoring network of induction motor through Modbus fieldbus.The research comprises the hardware structure of the control system,the parameter setting of the frequency converter and the design of the PLC control program.Owing to the relative low cost of the control system and its realization of the stepless speed regulation of the motor and the remote real-time monitoring,the network is worth being popularized.