At the end of the article, there are 55 practical case materials.Introduction: In our actual devices, it is often necessary to achieve data exchange between multiple devices. Generally, we use the Modbus RTU protocol, but this type of communication cable connection is not very convenient. Therefore, we can use the Modbus TCP protocol for communication, which only requires a network cable connection, making it very convenient! This article will guide you to learn about Modbus TCP communication between Siemens 1200 PLC and Inovance PLC.Modbus TCP Communication.1. Controller Requirements:(1) 1200 PLC as the client, Inovance EASY521 PLC as the server.(2) 1200 PLC writes data from addresses MW100, MW102, MW104, MW106, MW108 into D0, D1, D2, D3, D4 of the Inovance PLC.(3) 1200 PLC reads data from D5 of the Inovance PLC and stores it in MW200 of the 1200 PLC.2. Program Development(1) Create the 1200 PLC hardware and set the IP address and system clock as shown in the following images.
(2) Create a DB data block and specify the Inovance IP address as: 192.168.0.2.
Note: The TCON_IP_V4 data type is manually entered.
Client Programming (1200 PLC)
Create a program block and call the MB_CLIENT instruction to write and read data from the server. Since multiple read and write operations are needed for the same server, the background DB block and Connect connection parameters for the MB_CLIENT instruction must be consistent. The MB_CLIENT instruction must be called using polling operations.
Server Programming (Inovance)
For the Inovance PLC, simply set its IP address to 192.168.0.2.
Data Monitoring
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