This controller provides good results as compared with the ON/OFF type controller. This procedure will continue till the error reaches Zero otherwise the value of the feedback variable becomes equivalent to a fixed point. Based on that, it alters the system output. This system evaluates the feedback variable using a fixed point to generate an error signal. PID Controller Block DiagramĪ closed-loop system like a PID controller includes a feedback control system. At last, automatic PID controllers were extensively used in industries in the mid of 1950. In 1942, Ziegler & Nichols have introduced tuning rules to discover and set the suitable parameters of PID controllers by the engineers. After that, in the year 1940, the first pneumatic PID controller was developed through a derivative action to reduce overshooting problems. This retuning included the error which is known as the proportional-Integral controller. After a few years, control engineers removed the error of steady-state that is found within proportional controllers through retuning the end to some false value until the error wasn’t zero.

After that, TIC (Taylor Instrumental Company) was implemented a former pneumatic controller with completely tunable in the year1933. In the non-minimum phase, based on the value of IAE, the PI-PID controller is better than the control 2DoF-IMC.The history of the PID controller is, In the year 1911, the first PID controller was developed by Elmer Sperry. In the minimum phase, based on the value of IAE, the PI controller with detuning Mc Avoy better than the 2DoF-IMC in controlling levels and 2DoF-IMC better than control of temperature compared with PI-PID controllers. The PI-PID controller parameters are determined by Ziegler-Nichols tuning method which detuned by Mc Avoy method and BLT method, while the 2DoF IMC controller parameter is determined by MP-GM method. Two controllers are implemented to maintain level and temperature of tank I and tank 2 i.e. In addition, interaction between tank I and tank 2 also tank 3 and tank 4 was modified. Thus, this study modify the system by adding heater in tank I and tank 2. However, this system originally doesn’t have time delay that always occure in industrial process. Quadruple tank process is a simple prototype which represents the complicated multivariable dynamic process. Generally, chemical industry processes have the characteristics of a multi-variable process, and influenced by the disturbances which may be detrimental to the process.

Labview pid control tank level