For PID block , the equation are as follws:
1- Proportional only (P)
OUT=BIAS + 100/PBAND*(SPT-MEAS)
2-Integral Only (I) :
OUT=1/INT*(SPT-MEAS)
3-Proportional and Derivative (PD) :
OUT=BIAS + 100/PBAND*(SPT-(1+DERIV)*filtermeas)
filtermeas = MEAS/(1+tau+0.5*tau^2)
tau=DERIV/KD
4-Proprtional and Integral (PI) :
OUT=100/PBAND*(SPT-MEAS) + 1/INT*(SPT-MEAS)
5-Proprtional , Integral and Derivative (PID) :
OUT=(100/(PBAND*INT))*[(INT+1)*SPT-(INT+1)*(DERIV+1)*fitermeas]
filtermeas = MEAS/(1+tau+0.5*tau^2)
1/tau=(1/INT+1/DERIV)*KD
Noman
Jubail Chemical Industries Co.
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