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In a process control system where the sources of control parameters are separated in large area, it is computationally hard for controller hardware to operate multitasking so that one-central controller is not effective anymore. Therefore, it is considered to distribute controlling process in several Local Control Units (LCU). This paper proposed a simple master control algorithm that coordinates several PID controllers for controlling the complex parameters in the water mixing process. Level and Temperature are the main controlled variables (SVG) which are influenced by three parameters i.e. flow-in of cold water, flow-in of hot water, and flow-out of main tank. These parameters are then distributed to LCU-1 to LCU-3. For maintaining the SVG, the master controller is designed based on the difference between SVG and feedback of the main-tank (PVG) so that it results several Set-points (SV) which are then sent to each LCU. The obtained results indicated that the responses are 42s, 0%, 45.3s, for settling-time (Ts), %-overshoot (OS) and rise-time (Tr), respectively for water temperature controlling and 60s, 0%, 62s for Ts, %OS, Tr, respectively for water level controlling. Overall, complex process control involving many process parameters have been solved via distributed PID controllers.