As the earliest industrial control manufacturer entering the Chinese market, Siemens' market share has been very high. The quality of Siemens PLC is very good, its network stability and openness are deeply loved by industrial control personnel, and the programming software is classified and easy to use. It has a prominent position in the domestic industrial control industry. Although everyone has a certain understanding of Siemens PLC, but you want to tell the characteristics of Siemens PLC various communication methods, I believe many people can not fully answer. Here are some common Siemens communication methods? First, PPI communication The PPI protocol is the most basic communication method of the S7-200 CPU. It can communicate through its original port (PORT0 or PORT1), which is the default communication method of the S7-200 CPU. Second, RS485 serial communication Most of the third-party devices support, Siemens S7PLC can control serial communication by selecting the free port communication mode. In the simplest case, only send commands (XMT) are used to send information to third-party devices such as printers or inverters. In any case, it must be programmed by S7PLC. When the free port mode is selected, the user can control the operation of the communication port by sending an instruction (XMT), receiving an instruction (RCV), transmitting an interrupt, and receiving an interrupt. Third, MPI communication MPI communication is a relatively simple communication method. The speed of MPI network communication is 19.2Kbit/s~12Mbit/s. The MPI network supports up to 32 nodes and the maximum communication distance is 50M. The communication distance is long, and the communication distance can also be extended by the repeater, but the repeater also occupies the node. MPI network nodes can usually hang network components such as S7-200, human-machine interface, programming equipment, intelligent ET200S and RS485 repeaters. MPI communication between Siemens PLC and PLC generally has three communication methods: 1, global data packet communication method 2, no configuration connection communication method 3, configuration connection communication method Fourth, Ethernet communication The core idea of ​​Ethernet is to use a shared common transmission channel. This idea came from the University of Xiamen University in 1968. In 1972, Metcalfe and David Boggs (both of whom were well-known network experts) set up a network that connected different ALTO computers together with an EARS laser printer. This is the world's first personal computer LAN, which was first run on May 22, 1973. Metcalfe wrote a memo on the first run of the day. The memo meant to rename the network Ethernet (Ethernet), which was inspired by the idea that "electromagnetic radiation can be transmitted through the glowing ether." In 1979, DEC, Intel and Xerox jointly standardized the network. In 1984, thin cable Ethernet products appeared, and later hybrid Ethernet products of thick cable, twisted pair cable, CATV coaxial cable, optical cable and various media appeared. Ethernet is one of the most popular topological standards in the world. It has many advantages such as high transmission rate, rich network resources, strong system functions, simple installation and convenient use and maintenance. Five, PROFIBUS-DP communication The PROFIBUS-DP fieldbus is an open fieldbus system that complies with European and international standards. The structure of PROFIBUS-DP communication is very compact, and the transmission speed is very high and stable, which is very suitable for communication between PLC and field-distributed I/O devices.
Product advantages:
Features
1. Connect up to 6 USB devices at a time, and each device will receive a unique and tailor-made charge. The maximum output power of QC3.0 is 18W, which can optimize the charging of all devices.
One machine for multiple uses
Usb Charger,Usb C Charger,Usb C Power Adapter,Portable Usb Charger Shenzhen Jinziming Electronic Technology Co.,LTD , https://www.powerchargerusb.com
1. Stylish, portable, practical and convenient home charger
2. 6-port USB emergency charger, which can be used safely for tablet computers and can charge 6 devices at the same time
3. Built-in IC chip and fuse, protection: over current, over voltage, short circuit protection
4. The latest release, new design, beautiful appearance, high efficiency and energy saving, the best alternative to the original charger
5. Chargers for MP3, MP4, GPS, PDA, e-books, mobile phones, digital cameras, tablets, etc.
(1) Overcharge protection
(2) Over discharge protection
(3) Short circuit protection
(4) Voltage stabilization protection.
(5) Automatic identification of mobile phone current protection.
2.2QC3.0+4 ports total 6 charging ports, which can charge 6 devices with a total power of 84W at the same time
3. With multiple protection safety systems, the product will automatically adjust the charging current according to the needs of the device being charged. Automatically detect and adjust the charging current to charge your device at the fastest speed.
The USB charger can charge 6 devices at the same time, and the smart recognition technology will detect and provide the best charging level for each of your devices.
The maximum output current of a single USB port is 2.4A. 2QC3.0 has 6 charging ports, which can charge 6 devices at the same time without causing shunting or reducing power. The USB charger can quickly charge your devices. Smartphones and tablets can receive up to 2.4 amps of current, so you can use the device as you like while charging.
Over-current, over-charge, and short-circuit protection will make charging safe, without any risk of overheating or damaging the device. Passed CE/FCC/ROSH/PSE/CCC certification. Through safety certification to ensure safe use.