The Research On The Application Of PLC To The Auto-control System In The PS Plates Manufacture Line

In recent 30 years, PLC as a general industrial controlling computer system , has experienced a leap from line connected logic to storage logic. Its functions has become tremendously wider and has achieved a progress form logical control to digital control and Its applied fields has covered simple control of single facility, controlling movement with competence, collecting and distributing control etc. Nowadays, PLC has become the main facility of industrial control and has made great contribution to the world development.The article introduces the definition of PLC and provides the detail introductions of hardware's structure & software's operating principles. The PLC applied in system is the type of FX2—128MR from MITSUBISHI in Japan. Therefore, the basic instructions in PLC of FX2 were also include in the paper.The article is mainly written to solve the controlling problems in a certain manufacture line by using PLC, so as to achieve the goals of stable starting, reliable operations and low errors rate. The paper significantly introduces the program component of PLC in FX2, drawing–up regulations of ladder diagram. The aim of auto-control is also achieved by communication testing, stand-along, linkage debugging by using PLC. Not only plays an important and decisive role in driving the development of the company in the field of PS plates , but also provides scarce opportunity for other enterprise producing PS plates to make full use of those experiences.