Abstract: This paper describes the use of a car factory assembly line PLC control of the electrical control system of a way. With Rockwell Automation s PLC-5 Series PLC and DeviceNet bus assembly plant can easily achieve complex control system management and monitoring.
Keywords: bus Ethernet DeviceNet programmable logic controller ladder LAN man-machine interface
1, System Overview <BR> transmission lines and automobile factory assembly line is a very complex control system, it needs to control the turnout, stop device, capture device, isolating switch, emergency stop switches, proximity switches, photoelectric switches, conveyors, tension, lifting machines, lift platform, and many other implementing agencies. Chery second phase assembly shop with two assembly lines, mixed lines of four models of production, the high degree of automation, control system complexity. Control points throughout the central control room and four remote control stations, the formation of a whole plant industrial local area networks, remote control cabinet by the PLC via Ethernet to control their own production in the region sent to the central control computer system.
2, system selection and characteristics
PLC (programmable logic controller) control system as an alternative in a complex sequence of control electromagnetic relay there, starting from its birth, it has good development prospects and a bright future. As the bus control and the emergence of the network and applications, PLC unleashed, keep the infiltration of various sectors. Now, in almost every industry sector can be seen figure PLC.
Our products under the automatic control officers on the practical application of experience and concluded that in careful analysis of the international well-known control system based on the company s products and in view of a project by Rockwell Automation AB brand of PLC products good running condition, so the second phase of the AB brands still use PLC, to control the entire production plant.
Rockwell Automation owns a century-old famous brand, AB PLC brand reputation in the global industrial sector. PLC-5 Series PLC AB brand family as a mature product with many functional modules that can achieve a variety of complex control systems.
In addition, a number of Rockwell Automation software, powerful, on the AB s products have broad support. There RSLogix 5, RSLogix 500, RSLogix 5000, SLC 500-AI Series programming software to control network configuration software RSNetWork a series of ladder programming package for Rockwell Automation s products provide reliable communications capabilities, powerful programming features and excellent diagnostic capabilities and surveillance capabilities, and operational control functions.
After careful consideration, we finally identified the Rockwell Automation PLC-5 programmable logic controller, RSLogix 5 programming software, RSNetWork control network configuration software and RSView automatic control system consisting of monitoring software to control the entire production assembly plant assembly line, to achieve various functions, to meet the entire plant automation control systems. In addition, the second phase of the welding Chery transmission lines and transmission line painting also uses Rockwell Automation AB brand PLC.
We chose the PLC-5/40E CPU, memory capacity, data-processing capability, a powerful network with Ethernet port, no additional Ethernet communication module.
PLC-5/40E CPU use of a key switch to change the processor s operating mode:
1.RUN (running)
In the run mode, the user can not create or delete files, create, or delete data files, or through the programming software to change the mode of operation.
2.PROG (Programming)
In programming mode, software can not change the operating mode programming
3.REM (remote)
Through the programming software, remote programming, remote testing, remote operation mode changes between.
RSLogix 5 programming software with reliable communications, powerful programming features and excellent diagnostic capabilities and surveillance capabilities, and operational control functions:
Diagnostic and troubleshooting tools for reliable communications project a unified view of a flexible ladder logic programming Symbol easy view of the optional communications configuration ladder
Using RSLogix 5 ladder logic programming software, you can optimize system performance, save project development time and increase productivity.
RSView32 SCADA software is the Rockwell Automation has introduced the configuration software platform easy to use, can construct a flexible interface and powerful features, with RSView32 configuration software can develop a strong combination of images:
Fast and flexible image switch flexible and efficient power and Alarm operation simple and intuitive way of flexible and practical function of practical management settings
Use PC monitoring software RSView32, sitting in the central control room, you can now monitor all the mechanized equipment, on-site production at a glance.
Third, the system structure and configuration <BR> Rockwell Automation s communications network is divided into three levels: information layer, control layer and device layer. Information on Ethernet layer, data collection for the whole plant and procedures for maintenance. Control layer application controlNet, DH, DH485, remote I / O network. DeviceNet network device level applications, the underlying equipment for low-cost, efficient information integration.
Rockwell Automation based producer / client mode control network communications technology that have stringent requirements on time transmission control information, while other information such as time information also can be conveyed without demanding, will not affect time demanding information transmission. The control network has the following features:
Continuity of transmission and scanning ladder logic program to a user asynchronous I / O mapping table, set the communication rate equal or faster rate of transmission of the control network to ensure data is accurate, reliable, fast send , transmitting, receiving and processing.
Assembly shop floor control system is a network based on DeviceNet Fieldbus control system. Control system consists of a central control cabinet and the composition of the four remote control cabinet, and with the Ethernet connected PC and enterprise. The lowest level of the system is the equipment control layer mainly fulfills ????????§ machines on control and monitoring; control Wang mainly through the host computer to complete the whole plant production lines right line monitoring device control layer to control commands issued; at the top are EtherNet network EtherNet network and the company s enterprise resource planning (ERP) system to connect to the ERP system throughout the plant production data.
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