PI Controller

CONTROLLER PROPERTIES

The PI-Controller is a combination of a proportional and integral controller.

The proportional term produces an output value that is proportional to the current error value. The contribution from the integral term is proportional to both the magnitude of the error and the duration of the error.

The idea is that you first set Ki value to zero and increase Kp until the signal oscillates then set the value of Kp to roughly half. Then increase Ki until any offset is corrected quickly enough for the process.

OVERVIEW

INPUTS

AIActual valueConnect the analogue input here
AAutomatic input1 = Automatic
0 = Manual (Mv value is output at AQ)
RReset inputA pulse at R causes the controller to start regulating at 0

PARAMETERS

Remanence Battery SymbolRemanenceSets the function block to be remanent, e.g. return to the last known scene after a power cut
TTarget valueThe desired setpoint for the controller to reach
STSampling timeTime interval for the new output value to be computed
TrThresholdIf error is less than the threshold parameter AQ will remain the same
KpProportional termCauses an output value that is proportional to the current error value
KiIntegral termIs proportional to both the magnitude of the error and the duration of the error
MvAnalogue value for manual modeThis parameter is output to AQ if manual mode is used (A = 0)
MinMinimum valueMinimum output value of AQ
MaxMaximum valueMaximum output value of AQ

OUTPUTS

AQAnalogue outputThe controlled signal is output here

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For more information on control click here!