Process Control Instructions
204 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Follow these steps to configure the tuner.
1. Put the CV into Manual mode.
2. Set the AtuneStart parameter.
The tuner starts collecting PV and CV data for noise calculation.
3. After collecting 60 samples (60*DeltaT) period, the tuner adds StepSize to
the CV.
After successfully collecting the PV data as a result of the CV step change,
the CV assumes its value before the step change and the AtuneStatus,
GainTuned, TCTuned, DTTuned, and RespTCTuned parameters are
updated.
4. Set the AtuneUseModel parameter to copy the tuned parameters to the
model parameters.
The function block then resets the AtuneUseModel parameter.
After a successful AutoTuneDone, the Atune parameter is set to one (1).
Tuning completed successfully.
This information applies to the CompactLogix 5370, ControlLogix 5570,
Compact GuardLogix 5370, GuardLogix 5570, Compact GuardLogix 5380,
CompactLogix 5380, CompactLogix 5480, ControlLogix 5580, and GuardLogix
5580 controllers.
The MMC instruction controls two process variables to their setpoints using up
to three control variables. The MMC instruction calculates the control variables
(CV1, CV2, and CV3) in the auto mode based on the PV1 -SP1, PV2 - SP2
deviation, internal model, and tuning.
Available Languages
Ladder Diagram
This instruction is not available in ladder diagram logic.
IMC Function Block Tuning
Procedure
Multivariable
Control (MMC)
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