Figure 1 – PID control algorithm structure
In algorithm, all three have different significance like Proportional
gain is directly linked with present error; more the error more the MV
output to reduce the error, Integral is linked with the past values
which were over the time & behaves accordingly and Derivative is a best
estimate of the future trend of the error, based on its current rate of
effect. The effect of PID controller parameters can be seen in Table 1.