PLC TRICONEX 4210 formed according to the process control and information integration process modules. Any process using PLC control, such as blast furnace feeding process, top-blowing converter steelmaking process, casting process casting, rolling and rolling or semi-continuous rolling, etc., may correspond to the requirements of the process operation of the controlled device, the position change, speed change, controlling relationship and changes in order controlled logistics and timing, the use of control processes described. The layers in the respective control process is generally run in automatic or semi-automatic mode of operation. Various control processes can be divided into many control module, such as the blending process and the fabric on the blast furnace feed process, the small section / wire rolling process in the micro tension and shears control processes, and so on. The input information for the process layer interface layer and output layer of man-machine interface and special calculation layer. Output information of the layer: the "automatic command" form sent to the stand-alone control layer for controlling the start and stop process equipment motors, solenoid valves, etc., opening and closing, etc., to form a complete process; to "flow instructions "form sent to special calculation layer, used to start the corresponding control data calculation and calculation of the conversion process. Special calculation layer: control model, control the process of calculating the parameters calculation calculation module and information integration. In the PLC application software, all related to the numerical control processing data or the like are in the form of centralized computing module to this layer. Such as blast furnace feed ingredients computing, casting secondary cooling water distribution calculation, rolling process micro tension calculation, calculation of the position control of the motor torque computing. The input layer is the man-machine interface layer, the process interface layer and control processes layer. The output layer functions: to "set point" in the form sent to the stand-alone control layer, as the setting value of equipment operation; to "control parameters" in the form sent to the control flow layer as an internal control process or control running between processes / transition condition sent between devices interlocking layer as interlock conditions for the device. 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