Communication Designing And Reserching Between PLC And Requency Converter Based On USS Protocol

Recently, many ways of automation technology develop together, which provides a series of technology solution for Industry Controlling. The development of the technology of Programmable Logic Controller, Industry Personal Computer, distribution Control System, HMI, EMCU upgrades industry automation technology.In the process of the industrial automation control development, the use of frequency converter is gradually concerned. The use of frequency converter is difficult, we need some time to understand it. The advantage of frequency converter is that it can reduce the power source and cost, many traditional equipments will be reconstructed at the technical problem. So the frequency converter technology which is popularized has a significant social meaning.At the same time, with the development of PLC, the industry automation is become more precision,more convenience,safer and more credibility. PLC is together with transducer to control the engine, realizing the long-distance watch network control system.In the projects, the synthetical automation of the whole workshop or factory have come true in many enterprises. Some programmable equipments of different companies that linked in single layer or sevaral layers of network could communicate each orther, which can be controlled in distibution or in concentration. So, communication and nets have been important to controlling systems, and the difficulty and priority of the designing of automation systems.In small automation control system, communication based on USS protocal is a good solution, which has simple hardware logic, good resistance of interferences. And in this way the field-can-controling of whole-workshop come true.This article discussed comprehensive application of automation control technology, combination of practices and many automation control technologies in common use, and that the S7-200 PLC and frequency converter of SIEMENS is applied to cupper block controling system. The PLC and frequency converter control the engine, which is based on the USS consultation RS485 to make network. The design of the communication between PLC and frequency converter is the most important. The article introduces a standard design, which could be applied to a series of automation systems. It could save the period and cost of the projects, which have gotten accomplishtion in a degree.