Programmable Logic Controller (PLC) is a kind of universal industrial control apparatus which is developed rapidly and used widely in recent years, taking microprocessor as its core, integrating microcomputer technology, automation technology and communication technology. It is applied very diffusely in varied field of industrial control with the characteristics such as all-round functions, flexible application, well reliability, high ratio of capability and price and easy maintenance and so on, having become a robust tool to realize industrial automation.
The content that this paper studied is to make use of PLC technology to realize the intelligent transformation of the scrape mud system, design the electric control system, apply the latest control technology to the lathe transform, and improve the stability of the scrape mud system, reliability and real time nature. The paper summarizes the general structure of PLC control system; puts forward the principle, content and step of PLC control system designing. Siphon blow against the system of soil characteristics and performance requirements Germany adopted a Siemens S7-200 series systems as a S7-214 controller focuses on the system's hardware and software design methods, focuses on the system's hardware and software design methods, Summary and Analysis of the timer used to achieve power-fail and try to keep the real-time clock function for automatic timing scratching the soil.
After running, practice shows that the PLC control system reliability and good real-time, fully satisfy the design requirements, achieved good economic results.
Keywords: Programmable Logic Controller Siphon scratching mud system Power down protection Real time clock
