Temperature is the most universal and important industrial parameter in all kinds of technical produce and scientific experiment. The manipulative precision of temperature will take a great effect on production or experimental result. In many cases，we need to control the temperature of various types of furnace, heat treatment furnaces, reactors .But they are complex and changing .As a result, its control over demand regulator .The mode of temperature control is various. The programmable logic controller(PLC) is Reliable、not easily to be jamming and easily to be learned and used , welcomed by workers and widely used in industry.
Programmable controller (PLC) is a digital electronic computing operating system, designed for applications in industrial environments designed. It uses a programmable memory for storage in its internal implementation of logic operations, sequence control, timing, calculation and arithmetic operations, such as operating instructions, and through digital and analog input and output, control of various types of machinery or the production process.
Configuration is to use application software to provide the tools, methods, and to complete the works in the course of a specific task. Configuration software applications is broad, it can be applied to power systems, water supply systems, petroleum, chemical and other fields of data acquisition and supervisory control and process control and many other fields. Before the concept of the configuration, in order to achieve a particular task, using the preparation process is achieved. Programming is not only a heavy workload, long and easy to make mistakes, can not guarantee period. The emergence of the configuration software can solve the problem. The Kingview can help complete the task in a few days.
This thesis mainly introduces a design of temperature control system with SIMATIC programmable logic controller (PLC) S7-200 and the Kingview configuration soft .We use the PLC s7-200 with cup 224、the K type thermocouple and temperature module EM231 as the hardware, and use the V4.0 STEP 7 Micro WIN to programming . The thermocouple can measure the temperature of the stove, and translate the temperature signal to the voltage signal. And then the EM235 will transmit it to the PLC after disposing the signal .This system use positional type PID arithmetic and Pulse-Width Modulation methodology .And the procedure use idea of coarse adjustment algorithm and the fine adjustment algorithm. The procedure will run with different PID parameter in different condition.
We have designed Human Machine Interface（HMI）with the Kingview configuration soft which is developed by domestic company . The Kingview can monitor and control the PLC on line. We also have designed several menu ,including the historical curve screen 、the real time curve screen、the data report forms screen、the alarm screen and parameter monitoring screen. Users can easily query the operation of PLC, data acquisition and on-line control.
The experimental results show that，the plc can work reliably, stably. The system using coarse adjustment algorithm and the fine adjustment algorithm can get a better result. That is fast response, small overshoot, rapid adjustment, high accuracy. The Kingview is powerful, easy to operate. We can speculate that configuration software will have a good prospect for development.
