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Inst Tools > Blog > PLC Tutorials > PID Simulator Download

PID Simulator Download

The PID controller simulator represents a very useful tool to understand the basic PID algorithm. Download and run the simulations.

Last updated: March 4, 2021 10:48 am
Editorial Staff
PLC Tutorials Control Systems Excel Tools
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PID controller simulator represents a very useful tool to understand as algorithm PID works.

Contents
PID AlgorithmClosed-Loop ControlDownload PID Simulator

In addition, the concept as direct or indirect controller action, 4-20 mA analog input/output signal, fail close or fail open control valve are fundamental to determine the correct implementation of the closed-loop control.

PID Algorithm

This worksheet simulates a simple level of control in a tank. The algorithm PID, for discrete values, is used to simulate the process:

PID algorithm

For those interested, I would like to share the excel document in which it is possible to see the calculations.

It was considered that the controller has in the input (Cin) and in output (CO) the variables according to the standard 4-20 mA.

Closed-Loop Control

Closed Loop

Sampling time ∆t is equal to 1 s. The system is initially in a steady-state with a settable input flow rate equal to the output flowrate.

At t = 0 it takes a step disturbance on the discharge line by means of the pump.

Through mass balance, the actual level (Present Value) is calculated. Obviously, in real-case, there is a Level Transmitter that “read” and communicate at the controller the PV.

It is possible to put in the system a dead time just to see the effect on the PID controller.

The algorithm PID determines the control action on the control valve that modify the inlet flowrate.

The control valve has a linear characteristic: Fin= % opening valve / 100 * Fmax, in.

To disable the derivative action is sufficient to set Td = 0 (refer to sheet “Calculation”, cell J8) while to disable the integral action set value 0 in the cell J9, excel sheet “Calculation”.

PID Simulator Download

Note: this excel file simulates an “academic” version of the PID controller.

Download PID Simulator

Author: Domenico Luca Romilio

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3 Comments
  • Jumel Navidad says:
    January 25, 2023 at 3:16 am

    Thx for article it is very helpful to me

    Reply
  • Raed says:
    August 23, 2023 at 3:01 pm

    great

    Reply
  • Zhao Haiyang says:
    November 23, 2023 at 3:12 pm

    thank you

    Reply

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