This paper introduces Eview touch screen, Modbus protocol, the realization of communiacation between Eview touch screen and intelligent instrument, and TMS320F2812 s integrated development environment of MMB(Micro Message Bus) and the scene intelligent instrument of TMS320F2812 communications with Eview touch screen by Modbus protocol.

By analyzing the process and control principle of press, a touch screen control system of SIEMENS S7-200 PLC and EVIEW touch screen is introduced, including hardware, software and HMI of this control system and etc.

Research of the control system of automatic arc brazing equipment based on PLC and touch screen technology;

Application of PLC and touch screen on control system of thin wall rectangle tube welding;

Application of touch screen on state monitoring and faults diagnosis system of alumina electrolysis multi-function crane;

Design of Human-machine interface based on touch panel for portable biochemistry analyzer;

Realizing multi-stage PID temperature control by using PLC and touch panel;

Design of dynamic ice-storage air-conditioning control system based on PLC and touching screen;

Control system of high precision leather embossing machine based on PLC and touching screen

Adapting PLC and touching screen to realize the human - machine interface.

It adopts Siemens S7-200 PLC +TP170B touch-screen in its control frame and PID arithmetic to control the main parameter-excitation current,thus realizing the optimal control of the magnetic separator system.