S7-1200 Modbus RTU Communication Overview (Data information source: Siemens official website) Modbus has two serial transmission modes: ASCII and RTU. Modbus is a master-slave communication mode with a single master station. There can only be one master station on the Modbus network, which does not have an address. Each slave station must have a unique … Read more
1. What is MODBUS? 1. Basic Concepts MODBUS is a soft communication protocol initially advocated by MODICON (now a brand of Schneider Electric). After practical application by most companies, it has gradually been recognized and has become a standard communication protocol. As long as data communication or transmission follows this protocol, different systems can communicate. … Read more
Introduction Today, let’s discuss Modbus, starting with the main content of today: 01 Terminology Interpretation 02 Background 03 Protocol Principles 04 Transmission Methods 05 Differences Between Modbus RTU and Modbus ASCII 06 Modbus TCP and Its Considerations 07 Function Code Roles 08 Security Analysis of Modbus Protocol 01 Terminology Interpretation Checksum: A checksum is typically … Read more
01 Terminology Interpretation 1 word = 2 bytes; 1 byte = 8 bits. Checksum: A checksum is derived from the preceding data through a certain algorithm to verify the correctness of the data set. When inputting codes as data into a computer or other devices, input errors can easily occur. To reduce such input errors, … Read more
Hello everyone, good evening! How have you all been recently? Has the pandemic affected you in any way? Today is still a technical article: Siemens PLC Communication – Modbus RTU Communication – New Features of S7-1200 Modbus (RTU) Instructions V4. Modbus RTU Communication: S7-200 smart Modbus RTU master station communication (√) S7-200 smart Modbus RTU … Read more
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Industrial automatic control systems integrate information management and automatic control by summarizing, analyzing, and organizing various information collected by industrial control computers from sensors and local area networks, ensuring information security through access authentication. Industrial automation control is mainly divided into three parts: industrial automation systems, hardware, and software. The commonly used industrial automation control … Read more
Search on WeChat Technical Training Introduction Today, let’s talk about Modbus. First, let’s look at the main content for today: 01 Terminology Interpretation 02 Background 03 Protocol Principles 04 Transmission Methods 05 Differences Between Modbus RTU and Modbus ASCII 06 Modbus TCP and Its Considerations 07 Function Code Functions 08 Modbus Protocol Security Analysis 01 … Read more
Click on the “Technical Training” above and select “Top Official Account“ Over 160,000 industrial control professionals follow this WeChat platform: technical sharing, learning exchange, industrial control videos Detailed structure diagram of Siemens S7-200 SMART PLC 1. Siemens S7-200 SMART as Modbus Slave 1. Check the Micro/WIN SMART Modbus RTU Slave instruction library (Figure 1), which … Read more
Search on WeChat Technical Training 01 Siemens S7-200 SMART as Modbus Slave 1.Check the Micro/WIN SMART Modbus RTU Slave instruction library (Figure 1), which should include the MBUS_INIT and MBUS_SLAVE subprograms. 2.Use SM0.1 to call the MBUS_INIT subprogram for initialization, and use SM0.0 to call MBUS_SLAVE, specifying the corresponding parameters. Detailed explanations of the parameters … Read more