4、度控制领域能够广泛应用。 关键词：温度控制;可编程控制器;人机界面 Abstract: Programmable Logic Controller (PLC) is a kind of automatic control equipment which is widely used in the industrial manufacture. It merges the traditional control technology, computer and communication technologies with a strong abilit
5、y to control, flexible operation, high reliability and suitable for long-term characteristics of continuous work. It is very suitable for temperature control requirements. In the industrial field, with the rapid increase in the degree of automation, it is more and more important
6、to monitor the process of control system for the users. The emergence of human-machine interface meets the needs of users. Man-machine interface can comprehensively monitor the control system, including process monitoring, alarm, data logging and other functions, so that the cont
7、rol systems have become user-friendly operation, the process of visualization and it will play more and more important part in the field of automatic control. we use the PID control arithmetic software module which is contained in the program software STEP 7 -Micro WIN so that t
