自动化 PLC 外文翻译 外文文献 英文文献及译文.doc

At present,the main control way in automation field are rlay control,puter control and PLC control. Compared with the relay control system and the puter control systerm,the PLC control systerm has a series of advantages,sush as little work load of designing,installing,wiring and debugging, short cycle of development of working environment and convenient maintenance. Meanwhile, the relay control systerm has already been few used on the machine control systerm is inferior in ability of anti-interference, high in requirement of working environment and long in desigong and developing cycle of the control systerm. So its application has being on deining trnd in the automation conrol field by year.
The electrical control system of z-3040 Radial arm drill has many defects such plex circuit, high failure rate, large maintenance workload, poor reliability and flexibility. This paper introduces the z-3040 Radial arm drill relay contact analog control system reformation with PLC to guarantee the rapidity, accuracy and rationality of electric control system. It satisfied real production demand and enhance the economic benefit.
The original was introduced initial controller of programmable distinguishing feature and performance. Analyses on z-3040’s Radial arm drill technique property and the work cycle distance travelled by a stream of water base, expounded the initial controller of application ES’s set programmable carrying on the technological transformation system design to such, and e out the control procedure trapezium picture.
What is a PLC control system?
Since the 1960s the United States to launch programmable logic controller (Programmable Logic Controller, PLC) to replace conventional control devices since the relay, PLC has been rapid development in various parts of the world have been widely used. At the same time, PLC's function also improved. puter technology, signal processing technology, control work technology development and user demand for continuous imp