Allen-Bradley LOGIX 5000 Reference Manual page 86

Controllers advanced process control and drives and equipment phase and sequence instructions

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Process Control Instructions

Function Block

Structured Text

PrimaryLoop.PV := Local:1:I.CH0Data;

PrimaryLoop.CVInitReq := SecondaryLoop.InitPrimary;

PrimaryLoop.CVInitValue := SecondaryLoop.SP;

PrimaryLoop.WindupHIn := SecondaryLoop.WindupHOut;

PrimaryLoop.WindupLIn := SecondaryLoop.WindupLOut;

PIDE(PrimaryLoop);

SecondaryLoop.PV := Local:1:I.Ch1Data;

SecondaryLoop.SPCascade := PrimaryLoop.CVEU;

PIDE(SecondaryLoop);

Local:2:O.Ch0Data:= SecondaryLoop.CVEU;

For a cascaded pair of loops to work correctly, the secondary loop must have a

faster process response than the primary loop. This is because the secondary loop's

process must be able to compensate for any upsets before these upsets affect the

Rockwell Automation Publication 1756-RM006K-EN-P - November 2018

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