Process Control Instructions
184 Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Follow these steps to configure the tuner.
1. Put all three CV parameters 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.
To identify models and to calculate response time constants for all three CV-PV
processes, run the tuner up to three times to obtain CV1-PV, CV2-PV, and CV3-
PV models and tuning, respectively.
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 IMC instruction controls a single process variable by manipulating a single
control-variable output. This function block performs an algorithm where the
actual error signal is compared against that of an internal first-order lag plus
deadtime model of the process. The IMC function block calculates the control
variable output (CV) in the Auto mode based on the PV - SP deviation, internal
model, and tuning.
Available Languages
Ladder Diagram
This instruction is not available in ladder diagram.
Procedure
(IMC)
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