Click ↑↑ above to follow, reply “1” to receive PLC programming software 1. The touch screen controls the variable frequency drive (VFD) through PLC. 1. Currently, to control a variable frequency drive, it is generally necessary to use PLC to communicate with the VFD, read the information from the VFD, and then the touch screen … Read more
Engineers often encounter the following problem: why can’t my touch screen communicate with the PLC? For example, here are two common issues: 1. Weintek Touch Screen and Siemens PLC Cannot Communicate, Always Prompting PLC No Response. How Should I Set It Up? Solution Approach: You need to set the same baud rate, the same data … Read more
How to Learn Mechanical Drawing? It Would Be Too Difficult Without These Materials! (Click on the above brown text to download the materials) In engineering, the RS485 control line is often mentioned. What exactly is it? Today, I will discuss the applications related to RS485. By delving into RS485, you will find that there is … Read more
A pull-up resistor connects a signal line to a fixed high level VCC, keeping the signal line in a high state when idle, which is known as a pull-up resistor. The pull-up resistors on a bus have different roles; for example, the pull-up resistors for I2C are determined by the internal structure of the I2C … Read more
RS485 interfaces form a half-duplex network, typically using a two-wire system, often employing shielded twisted pairs for transmission. This wiring method allows a maximum of 32 nodes to be connected on the same bus topology. Initially, data was output as analog signals for simple process quantities, and the RS232 interface was used for instrument connections, … Read more
1. What Is RS485 Bus The RS485 bus is commonly used in industrial settings to collect multi-point data, whether analog signals or switch signals. RS-485 operates in a half-duplex mode and supports multipoint data communication. The RS-485 bus network topology generally adopts a terminal-matched bus structure, which connects various nodes in series along a single … Read more
PLC communication can be divided into communication between PLC and external devices, as well as communication between PLC and internal system devices based on device classification. Depending on the communication objects, it can be further divided into the following situations.Communication Between PLC and External Devices:1. Communication between PLC and computers: Communication between PLC and the … Read more
Fire Prevention Before Ignition, Rely on Love for Safety Click on “Yi Ai Fire Protection” above to subscribe Technical GuidanceYi Ai Fire Protection 36V Centralized Power Control Fire Emergency Lighting and Evacuation Indication System System Wiring and Cable Selection The communication trunk (RS485 communication line) of the emergency lighting controller and the two-wire emergency lighting … Read more
Search WeChatTechnical Training Differences Between RS232 and RS485 Interfaces 1. Physical Structure of the Interface 1. RS232 Interface: One of the computer communication interfaces, RS-232 typically appears in the form of 9 pins (DB-9) or 25 pins (DB-25). Usually, personal computers have two sets of RS-232 interfaces, referred to as COM1 and COM2. 2. RS485: … Read more
Overview of SMART Panels The SMART panels are divided into the first generation product SMART LINE and the second generation product SMART LINE IE. The first generation does not have an Ethernet port, including Smart 700 and Smart 1000; the second generation integrates an Ethernet port, including Smart 700 IE and Smart 1000 IE. Currently, … Read more