Past and Present RS-485, what does RS mean? It is an abbreviation for Recommended Standard, which means a recommended standard. 485 is the standard identification number, and there is no need to delve into why this identification number is set. RS-485 is also known as ANSI/TIA/EIA-485, these prefixes are abbreviations of standard associations’ names, for … Read more
1. Hardware Setup The Modbus communication in the program is conducted between the 0 communication ports of two S7-200 CPUs (it is best for each CPU to have two communication ports). On the master side, communication can also be established using the corresponding library files “MBUS_CTRL_P1” and “MBUS_MSG_P1” through the 1st communication port. Communication port … Read more
Search on WeChat Technical Training In 1979, Schneider Electric established a bus protocol for industrial sites called the Modbus protocol. Nowadays, many industrial applications using RS485 communication adopt the Modbus protocol. Today, we will explore RS485 communication and the Modbus communication protocol. 1. Introduction In fields such as industrial control, power communication, and smart instruments, … Read more
Source | Guoguo Little Master Modbus is considered a classic communication protocol in the embedded field. Whether you are a beginner or an engineer with years of experience, it is essential to understand it. 1. What is Modbus? As the name suggests, it is a bus protocol. For example, serial protocols, IIC protocols, and SPI … Read more
Here we continue to share knowledge about MODBUS communication between the HMI and the variable frequency drive (VFD).Previously, we discussed the two steps required to achieve communication between the HMI and the VFD: (1) Selection of communication driver in the HMI (2) Establishment of variables in the HMI Today, we will continue to share some … Read more
The Most Comprehensive Free Industrial Control Software! (Click the red text above to get free materials) Introduction:The ModBus network is an industrial communication system formed by connecting programmable controllers with intelligent terminals and computers through common lines or local private lines. Its system structure includes both hardware and software. It can be used for various … Read more
Full Set of PLC (Omron and 10 Other Brands) Learning Materials,Free to Claim (Click on the Red Text Above to Claim Materials for Free) Modbus Communication Protocol The Modbus protocol is arguably the most widely used communication protocol in the field of industrial automation. Its openness, scalability, and standardization make it a universal industrial standard. … Read more
The ModBus network is an industrial communication system formed by connecting programmable controllers with intelligent terminals and computers through public or local dedicated lines. Its system structure includes both hardware and software. It can be applied to various data acquisition and process monitoring. The ModBus network has only one master, and all communication is initiated … Read more
1 A weight instrument supporting the Modbus protocol A weight instrument supporting the Modbus protocol 2 Set the communication parameters of the instrument You can adjust according to your requirements, as long as it is consistent with the PLC side. Baud rate: 9600 Data format: 8n1: 8 data bits / no parity bit Communication method: … Read more
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