Temperature Controller System Based on PLC Project
Temperature Controller System Based on PLC Project report
The programmable logic controller (PLC) is an industrial control computer; it is the new automatic device inherited computer, automatic control technology and communication technology. System temperature signal detected by the temperature sensor. The temperature transmitter will be the temperature value converted into a voltage signal of 0-10V into PLC. PLC voltage signal setting compared to the temperature deviation after PID operation; the system will issue a temperature control signal to reach the electric heater voltage control. So that it implements a continuous monitoring and control of the temperature. The temperature monitoring system in the industrial field has a certain value.
The temperature is commonly used in the industrial production process parameters, while closely related to people's lives. In many fields of scientific research and production practice, the temperature control occupies a very important position, especially in metallurgy, chemical industry, building materials, food, machinery, petroleum and other industries, has a pivotal role. Programmable Logic Controller (PLC) is an industrial control computer; inherit computer, automatic control technology and communication technology as one of the new automatic device. It has strong anti-interference ability and cheap price, reliability, programming is simple, easy to learn and use, by the project operator, like in the industrial field, the PLC has been widely used in various areas of industrial control. The configuration software is an automatic control system monitoring layer a software platform and development environment. Its flexible configuration will provide users with software tools to quickly build industrial automatic control system monitoring and general level. Before the appearance of the configuration software, the industrial areas of the user by hand or entrust a third party to write HMI (Human Machine Interface software), it has developed a long time, low efficiency and poor reliability shortcomings; or buy a dedicated industrial control systems. It usually is a closed system, the choice of small, often can not meet the demand, and it is difficult to exchange data with the outside world, upgrade and add functionality to be severely restricted. The emergence of the configuration software configuration software allows users to build a system which best suits their own applications. With the rapid increase in the level of industrial automation, computer widely used in the industrial field, a wide range of control equipment and process monitoring devices in industrial applications, industrial control software has been unable to meet the diverse needs of the user. In the development of the traditional industrial control software, once the industrial controlled object changes, it is necessary to modify the source code control system, leading to long development cycle; industrial control software has successfully developed so that each control different repeated low usage, it's expensive. General industrial automation configuration software can be a good solution to the problems of traditional industrial control software, enables users to any configuration of objects and control purposes, the completion of the final automation control engineering.
The temperature control system hardware block diagram is shown in Figure 1. System controlled object is a signal of the temperature, and the temperature sensor detects the temperature of the heating tube. Through the output module, the temperature value is converted to a digital signal fed to the PLC module. PLC to the temperature signal obtained with the temperature settings are compared, and then get the temperature deviation after PID operation, it will issue a control signal and the corresponding operation, such as higher than 50 degrees Celsius, and the alarm.