Abstract
Along with social progress and the rapid development of a variety of light industry, chemical, chemical plants have become indispensable to the national economy as well as generate critical to a business. There are a variety of chemical chemical chemical devices, can be said that the application of chemical plant is very common, and in industry occupies a very important position. In this paper, design a programmable controller used for the chemical reaction device in the process of the system, programmable controller is an intelligent controller, he has his own CPU and control software, mainly to complete the field data acquisition, conversion, storage, alarm and control functions. We designed this system, there are two states is automatically a state, the other is the manual states, where we mainly study the automatic. System can display the temperature in time; once the temperature exceeds a given range on the alarm; and temperature can be pre-given value, which gives a variety of chemical substances to provide the conditions for the reaction. The whole system made full use of modern advanced technology, to improve labor productivity, improved working conditions, reducing the labor intensity, not only can overcome the human factors of instability, but also can absorb artificially adjust the advantages of a modern production and management provides a strong strong material conditions for social development and progress.
Key words: PLC chemical reaction device PID digital display
