This paper describes the two inputs - two outputs control theory. The theory is using the simplify decoupler filter that can reduce the disturbance arising from loop interaction. The system controls both the pressure and flow rate in the closed tank. The media of the process is water. The work includes four important aspects: Designing, Implementation and Test. In this design consist of two parts such as models of the process and decoupler. In this simulation was used a MATLAB to finding a suitable decoupler. In this implementation was used a personal computer, Pressure Transmitter, Magnetic Flow Meter, DP/PA coupler, Convertered IF 303, FI303 and The controller of SIEMENS S7 400 Modules which all of implements was created to control systems by used the technology of PROFIBUS to create a networked control system(NCS). In this test was used to compare performance of the old TITO systems with the new TITO system.
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