introduction
Fieldbus technology adapts to the direction of decentralized, networked and intelligent development of industrial control systems. Once it has emerged, it has become a hotspot of global industrial automation technology and has received worldwide attention.
Since 1971, Rockwell Automation has produced a devicenet fieldbus-based plc for automotive line control. With the company's development, Rockwell has made significant achievements in the fields of factory automation control, microprocessors, radios, space shuttles, advanced communication systems and global positioning systems. Rockwell Automation provides users with a comprehensive range of industrial network solutions ranging from shop floor equipment control to enterprise level production control and information management - network integration automation-based enterprise information systems. Today, Rockwell Automation is committed to expanding the product range of cip-based automated controls. The cip is a three-layer network device network, a control network, and an application layer shared by the ethernet/ip network, which can help implement general control, configuration, data collection, and sharing on a range of devices. It also delivers significant benefits for automation users: reduced cost, increased ease of use, easier product and network integration, and the ability to support interoperability of devices from multiple vendors, providing device connectivity .
Ethernet/ip industrial Ethernet
Ethernet/ip was jointly launched by two important international organizations, odva and controlnet international, in 2000. It is a true standard industrial Ethernet using tcp/ip protocol. It has been supported by nearly 100 suppliers worldwide. There are currently hundreds of ethernet/ip products available for users to choose from, including process controllers , plc, i/o, inverters, soft starters, vision products, bar code scanning equipment, weighing equipment, power intelligent monitoring units, processes. Bus ff links equipment, switches, etc., and is widely used in various industries such as automobiles, food and beverage, electric power, chemical, water treatment, mining, metallurgy, building materials and tires.
The control network controlnet controlnet is based on the modified canbus technology and can be used as a communication logic control and process control system with a transmission rate of 5 mbps. The control network is a high-speed deterministic network for information transmission in applications where time is critical. It provides real-time control and messaging services for peer-to-peer communications. It acts as a high-speed communication link between the controller and the i/o device, combining the capabilities of existing networks. The Control Network is the most modern open network that provides the same functionality for i/o, real-time interlocking, peer-to-peer messaging, and programming operations on the same link. Deterministic and repeatable functions for discrete and continuous process control applications.
Device network devicenet devicenet devicenet is based on canbus technology, used for communication network between plc and field devices. It can be connected to switches, drag devices, solid state overload protection devices, bar code readers, i/o and human interface, etc., with a transmission rate of 125-500 kbps. The device network connects the underlying devices directly to the shop floor controller through an open network without having to connect them to the i/o module via hardwire. More than 150 distributors worldwide actively support the Open Device Network Sellers Association (odva) network based on can technology. This 64-node, multi-drop network allows a cable to connect devices up to 500m away from the user's programmable controller, eliminating the need to wire each device to an i/o rack. In short, all of this can reduce the cost of the wire and facilitate installation.
Automotive body-in-white welding line system
The automobile welding line is a robotic system integrated production line that assembles and welds the body stamping parts into a body-in-white. The structure is divided into a floor line and a main line. The floor line is mainly the front floor assembly, the rear floor assembly, and the engine compartment. The welding is integrated into the lower floor of the car body, and the main line is to combine the floor line, the left and right sides of the body, the front and rear roof beams and the top cover into a complete body-in-white. Each station is composed of corresponding welding fixtures , upper parts system, Spot welding equipment, conveying system, spot welding robot, robot control system and electrical auxiliary equipment. After the body is spliced, the key point accuracy is detected by the on-line measuring station, and compared with the model digital model, the dimensional tolerance is obtained, the quality is checked, and then the body is sent to the adjustment line for visual inspection, door and engine cover. The installation of the trunk lid and other workpieces has thus completed the process of welding the car.
Chery Automobile Welding Line Project Control Network Structure (see photo)
This project is the body welding line system of Chery's new model. The design idea reflects the design idea of ​​the new era automatic control system. The whole welding line is mainly composed of 51 kuka robot spot welding robot systems and related mechanical equipment. The conveying equipment includes Rolling machines, reciprocating rods, chain conveyors, fixtures, ems trolleys, etc., control equipment includes 7 sets of guard logix plc system and related modules. The drawing is a frame diagram of a set of plc control areas in the whole system.
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