This paper firstly gives a brief introduction for the function of T400 technology board,then lays beary stress on T400 technology board's interface,external connection,BICO technology and process data transfer,and finally introduces an example for direct tension control in SPW420 software package.

This paper analyzes the tension control strategies of rewinder and the principles of the T400 technology board,designed a system of reeling-off direct tension control based on T400.

And then introduced the composition and theory of vector inverter 6SE70 and T400 Technology board,especially two common methods of the vector inverter control and T400 technology board characteristics, while analysis and contrast three kinds of control mode of T400 technology board for the tension : direct tension, indirect tension, combined tension.

Using some scientific methods,for example,model of process plate for leathermaking and orthogonal experiment,the author made a series of experiments.

Based on the comprehensive development of high-grade pigskin leather, the author applied the methods of system engineering and operational research to study the process of leather making, and put forward the model of process plate of leather-making, tests showed that the technical research process will be more simple, scientific and standard after the application of the model.