2010•Journal of Mechanical & Electrical EngineeringRequires access

Modbus protocol and application in the communication between MCU and PLC

Xiaoqiang Hu

Abstract

In order to solve the poor man-machine exchange performance of PLC equipment,the Modbus protocol was analyzed which has been widely used in PLC,inverter and other automation instrumentation,and also it was introduced that how to composite the message frame in the chip.In addition,combined with SIEMENS S7-200 series PLC and STC89C58RD single-chip,it was elaborated that how to realize the communication between the MCU and the PLC.The results show that it lets the PLC devices be controlled by the system man-machine interface program,in order to address their shortcoming in man-machine exchange.

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Available abstract

Key concepts: Modbus, Microcontroller, Embedded system, Siemens, Frame (networking), Protocol (science), Interface (matter), Automation