CONNECTING A PLC NETWORK WITH MODBUS TCP/IP PROTOCOL WITH S71200 SERVER AND S71200 CLIENT

Abstract

With the strong development of automatic control and communication of equipment over the network, the need to connect devices together via Modbus TCP/IP protocol is essential in enterprises and factories in export processing and industrial zones in Binh Duong province. This paper presents the method of network connection between PLCs together. S71200 is the server and the S71200 is the client. These PLCs exchange data with each other via Modbus TCP/IP communication network. The network connection between the S71200 PLCs is made to use the Modbus TCP/IP communication protocol. The methods of transmission according to the Modbus protocol structure include the address, the interface, the number of blocks of data transmitted and received via the RJ45 network cable. Transmission of reading and writing data blocks between 2 S7 S7 1200s with Tia Portal V14 software program, connecting computers to monitor transmission parameters. The number of reading from PLC S71200 Server is 10 bytes (5 word read) and writing from PLC S71200 Client is 10 bytes (5 word write). This study provides an optimal solution in real network industrial communications and applies to training with high efficiency. Fast transmission speed and low cost according to Modbus TCP/IP standard. Can be applied intranet data transmission device control in enterprises, industry.