S7-1200 PLC Communication The S7-1200 PLC is a compact controller launched by Siemens, supporting various communication protocols and interfaces, suitable for device interconnection in industrial automation scenarios. 1. Supported Communication Protocols and Interfaces 1. Integrated Interfaces PROFINET (default support) Supports real-time communication (RT) and isochronous mode (IRT), used to connect HMI, drives, remote I/O, and … Read more
1. Key Points of UART Hardware Resources and Configuration UART Resources of ESP32ESP32 supports 3 UART controllers (UART0, UART1, UART2), but actual availability is limited by pin conflicts: UART0: Default for REPL debugging (flashing and serial monitoring), using GPIO1 (TX), GPIO3 (RX) UART1: Some development boards connect to external Flash/SD cards (conflicts should be avoided), … Read more
‖ System Learning Life is like a marathon; sometimes you need to pause and take a breather to go further. Why does Modbus RTU always appear with RS-485? What is RS-485? Before we dive into this issue, let’s first understand what RS-485 is, which you may have heard of but not fully grasped.In official terms:RS-485 … Read more
The EVE 200Smart PLC can utilize the Modbus RTU instruction library from Siemens software, or it can use EVE’s own UN Modbus RTU instruction library, providing users with two options. The difference between the two libraries is that Siemens’ MODBUS library is implemented in the upper-level PLC program, which is large in size, occupying almost … Read more
In the field of industrial communication, Modbus RTU and RS-485 are often mentioned together. Many people mistakenly believe they are the same thing, but in reality, these two concepts are entirely different; they are simply used in close conjunction in industrial control. What is RS-485? RS-485 is a physical layer communication standard that defines how … Read more
Abstract ❝ This article describes how to use C# to call the NModbus4 library and the System.IO.Ports library to implement Modbus RTU communication functionality【Project address at the end of the article】. Introduction Modbus RTU is a serial communication protocol, where the communication mechanism is a polling mechanism where the master device sequentially queries the slave … Read more
While organizing examples, I found a communication case for the Yu Electric flow meter. The model of the flow meter was not noted, making it impossible to determine its specific model. I can only organize and record this; those who encounter it can refer to it. It seems I need to be more careful in … Read more
PLC Protocol Optimization: Frame Structure Design to Reduce Transmission Overhead and Improve Efficiency! Introduction Hello everyone! Today I want to share a technology that can significantly enhance the communication efficiency of PLCs—frame structure optimization design. "A 30% increase in transmission efficiency is not a dream!" This seemingly technical topic is essentially about “slimming down” PLC … Read more
In scenarios such as industrial automation, building control, and energy monitoring, RS-485 serial communication is widely used for data transmission between devices due to itslong-distance transmission capability, strong anti-interference ability, and support for multi-node communication. Especially in a master-slave structure, RS-485 is an ideal choice for achieving centralized control and distributed sensing. However, during actual … Read more
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When we are establishing communication between HMI and PLC, we need to address a key issue, which is the parameter settings for the communication connection between HMI and PLC. This is a common question among many learners and is a focal point of our study. The communication between the touchscreen and PLC can be divided … Read more