The RS-485 bus is widely used in communication, industrial automation, and other fields. In practical applications, we often encounter the question of whether to add pull-up and pull-down resistors and what size of resistors is appropriate. Below, we will conduct a detailed analysis of these issues. 1. Why Are Pull-Up and Pull-Down Resistors Needed? 1. … Read more
Click the “Technical Training” above and select “Top Official Account“ 170,000+ industrial control professionals follow the WeChat platform: technical sharing, learning exchange, industrial control videos 01 Number of Connections The S7-200 SMART CPU can connect to Siemens HMI devices that support the PPI protocol through the integrated RS485 port or signal board, or it can … Read more
Click↑↑Technical Training, follow and pinto subscribe for free long-term 180,000+Industrial control professionals follow this WeChat platform: technical sharing, learning exchange, industrial control videos After establishing RS-485 communication between the inverter and PLC, commands sent by the PLC via the communication cable can be received. If multiple inverters are connected to the PLC via RS-485, each … Read more
Profibus PA (Process Automation Bus) is one of the most important field communication protocols in the process industry. It is designed for complex industrial environments and provides stable and efficient data transmission under harsh production conditions. This article will delve into the key features and application value of Profibus PA, helping readers gain a comprehensive … Read more
PROFIBUS Transmission Technology (Physical Layer) and DP Communication In the ISO/OSI reference model, the first layer defines the “physical” methods of data transmission. This includes encoding types and the transmission standards used (e.g., RS 485). PROFIBUS provides various transmission technologies for the first layer: RS 485, RS 485-IS, MBP, and fiber optic transmission technology. Traditional … Read more