Abstract: Temperature control system is widely using in electron and metallurgy and machine industry in our country. It has the feature of pure time delay and great inertia and variety of parameter etc. so it need high quality temperature controller. At present, most of enterprise is making use of drying furnace that it controlling precision is low and temperature in furnace is not uniformity. It do not fixit the request of technical. So the price of using is high and effect benefit of enterprise. It needs alteration.
In recent years, people research temperature controller deeply. Along with the development of computer technology, temperature controller have made a great progress and development, and appears some commercial temperature controller. For example: intelligentize PID and fuzzy control and self-adaptive control etc. The temperature controller offers better controlling precision and effect.
This essay deals with a method of temperature control system base on PLC. The author analyzed and researched temperature controller with pure delay time and great inertia, and also analyzed and researched that how to make certain the parameter of temperature controller. After analyzing PLC controlling system and controlling program, the author continued to analyzing feature and giving a judgment of the controlling system in the end.
Key word : temperature control ， time delay system ，PLC
