pytunelogix

Python PID Tuner for ControlLogix

Windows Exe (no install required) -> https://github.com/Destination2Unknown/pytunelogix/releases

To install use:

pip install pytunelogix

PID tuning in 4 Steps:

A-> Record PRC using Logger
B-> Tune using PID Tuner
C-> Refine tune using PID Simulator
D-> Test tune with FOPDT Simulator for Logix PLC

To use, create a launch file:

examplelaunch.pyw #use pyw for no console

PID Logger

To launch, use:

from pytunelogix.pidlogger import clxlogger

clxlogger.main()
    

Stage 1 - PID Tuner based on a CSV file of a Process Reaction Curve (PRC)

Notes and Limitations:

• Assumes CV and PV data stored at 100ms intervals.

• Assumes there is a single step in CV.

• Ambient is calculated as an average of the PV prior to the step change.

• Doesn't work correctly with a ramp in CV or with multiple CV steps.

N.B.
The PID tuning values are calculated for a PV with a standard range span of 100 in engineering units (e.g. 0-100 deg C or 50-150 deg F).
If the range of the PV has a different span the PID tuning values may need to be rescaled:

  Example 1: PV range of 200-400 deg C -> PID Gains x2

  Example 2: PV range of 75-100 deg C -> PID Gains x0.25

To launch, use:

from pytunelogix.stage1 import csvtuner

csvtuner.main()

Direct Acting:

Reverse Acting:

Stage 2 - Open loop tune

https://user-images.githubusercontent.com/92536730/175918442-017d18a0-0bac-434d-aa44-b8cd3aebe231.mp4

Premium Feature - https://github.com/sponsors/Destination2Unknown

Stage 3 - Closed loop tune

https://user-images.githubusercontent.com/92536730/175920990-3fc2cb66-9d08-4c67-aff7-ff410345f9a5.mp4

Premium Feature - https://github.com/sponsors/Destination2Unknown

Stage 4 - Adaptive tuner

https://user-images.githubusercontent.com/92536730/175921177-86389b8f-2d3c-4dc7-8949-db4cdd782d84.mp4

Premium Feature - https://github.com/sponsors/Destination2Unknown

PID Simulator

Direct Acting:

Reverse Acting:

To launch, use:

from pytunelogix.simulate import simulator

simulator.main()
    

ControlLogix FOPDT Process Simulator (PID Simulator)

Simulates a Process:

Direct Acting:

Reverse Acting:

To launch, use:

from pytunelogix.clxpidsim import clxsim

clxsim.main()
    

Windows Standalone Exe: