Hey guys, i know it is old post but i want to make math model of heating system, so i'm trying to implement transfer function in tia portal. I saw your examples, but when I try them, nothing happens. Any kind of help? Thanks in advance.

hdhosseini

Dear friends ,

This is an expansion to discussion previously made here:

Laplace equations in Step7

Simply this will provide all data and documents required for solving ODEs with SCL.Hopefully, first reading the document may help to refresh the Euler method.

Best regards,
Hamid Hosseini

Attachment

ODE.pdf(258 Downloads)

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Split from Numeric Methods to Solve ODEs(Ordinary Differential Equations ).

hdhosseini

Dear user,

You can use them with no problem.Copy the entire FB from "Numeric Methods to Solve ODEs(Ordinary Differential Equations )" that are customized for classic STEP 7 and save them as ".scl" external source and generate blocks.Follow the steps in the following video with an online test for TIA V15.

I hope it helps,

hdhosseini

Hello,

i need to simulate measuring transducer in PLC. One of my ideas was to use hdhosseini ODE algorithm but the equation is not finish. So i prepare an PDF file where i show how i try to solve the second order equation and simulate it. The result of response time from my alhorithms and ODE algorithm made by hdhosseini is really big and i don't know where i do misstake. I would be very grateful if someone check what i did and led me to a solution.

The second part of my question is straightly for hdhosseini's ODE alhgorithm from file ODE.pdf. I   have problem with understood how you get the final result of second order equation or how you deriving the formula.  At the and there should be the equation for output discrete signal y=x1... And i need to know how you define tag T_Internal ? It is similar to sampling time Ts ? The algorithm seems like correct but without explanation about output signal and what it is T_Internat tag it's not refers for any dynamical model of phisical object.

Can you help me with this?

 Im apologize for my all my typing mistakes, English is not my native language.

You can download the files here Files

hdhosseini

Dear  Kazuan;

Thanks for the message,I will share the important point :

1. Your files on server , can not be downloaded due to an alarm on my internet protection package.

I hope it helps

hdhosseini

 Ok, i try to add my files in post attachment. Inside is two files one PDF with all my equations and simulation, and second one is JPG file with your's second order euler equation. Thanks for you response ;)