CODESYS - the IEC 61131-3 automation software

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PostPosted: Wed Nov 27, 2019 9:44 am 
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Joined: Wed Aug 14, 2019 2:26 am
Posts: 5
Hello,
I was newly introduced to Codesys and automation programming. Is there any beginners tutorial that I can look at especially on PID controllers?
I am not sure how to create a project, which device should I choose.. I want to run a simulation with the PID controller. I read that the PID can be found in Util library. How do I drag it into the workspace? How to actually getting started with Codesys?? :? :?


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PostPosted: Wed Nov 27, 2019 10:59 am 
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Joined: Fri Feb 23, 2018 3:41 pm
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Lets have a look at the store then. I don't know if there is a specifical exemple on PID, but there are great ressources and wikipedia and codesys online help may complete your knowledge.

Codesys store
Codesys online help


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PostPosted: Wed Nov 27, 2019 3:01 pm 
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Joined: Mon Sep 05, 2005 9:42 am
Posts: 3624
Hi,
there is a new controller library available in the CODESYS store:
https://store.codesys.com/control-loop-library.html

The following function blocks are included in the library:
Controls
Controller_Base: Abstract basic function block for creating individual controls
Controller_P: Function block for implementing a P control
Controller_PD: Function block for implementing a PD control
Controller_PI: Function block for implementing a PI control
Controller_PID: Function block for implementing a PID control
Integrator approximation
Integrator_Base: Basic function block for creating individual integral approximations
Integrator_ParabolicApproximation: Function block for approximating the integral by means of a
parabola using the last values
Integrator_RectangleApproximation: Function block for approximating the integral by means of a
rectangle
Integrator_TrapezoidApproximation: Function block for approximating the integral by means of a
trapezoid
Anti-windup strategies
These functions blocks provide different strategies to avoid an overflow of the integrator in case of a prolonged
control variance.
AntiWindUp_Base: Abstract basis function block for creating individual anti-windup strategy
AntiWindUp_Clamping: Function block for using an anti-windup strategy that fixes the integrator value to the
set maximum
AntiWindUp_BackCalculation: Function block for using an anti-windup strategy that decreases the
integrator value over time
Differentiator approximation
Differentiator_Base: Abstract basis function block for creating individual differentiator approximations
Differentiator_BackwardDifference: Function block for linear approximation of the differential using the
last value
Differentiator_LinearAverageApproximation: Function block for linear approximation of the differential
using the last values
Differentiator_LinearFourPointApproximation: Function block for linear approximation of the differential
using the last values
Differentiator_ParabolicApproximation: Function block for approximating the differential by means of a
parabola using the last values
Control Loop Library
1/3
BangBang controls
BangBangController: Function block for implementing a BangBang control
BangBangControllerWithTimeHysteresis: Function block for implementing a BangBang control with timebased
hysteresis
BangBangControllerWithValueHysteresis: Function block for implementing a BangBang control with valuebased
hysteresis
Three-point controls
ThreePointController: Function block for implementing a three-point control
ThreePointControllerWithValueHysteresis: Function block for implementing a three-point control with
value-based modulation
Filters
Filter_Base: Abstract basis function block for creating individual filters
Filter_FIR: Function block for implementing a finite impulse response filter
Filter_IIR: Function block for implementing an infinite impulse response filter
Filter_SOS: Function block for implementing a second-order section filter
PWM Creator
PWM_CreatorBase: Abstract basis function block for creating individual PWM signals
PWM_Creator: Function block creating a PWM signal
PWM_Creator_FixedCycle: Function block creating a PWM signal with a fixed cycle time differing from the
task cycle time calling this Control Loop Library

If you start, always a good option is to use a raspberry pi, even better then to simulate it.
Just open CODESYS and goto the shopping card, search for the control loop examples ( install it that way to have an update notification later)

After installing this package you'll find the example projects then here:

"c:\Users\<yourWindowsUserName>\CODESYS Examples\Control Loop Library\1.0.0.0\WaterLevelSampleExtended.project"
"c:\Users\<yourWindowsUserName>\CODESYS Examples\Control Loop Library\1.0.0.0\WaterLevelSample.project"
"c:\Users\<yourWindowsUserName>\CODESYS Examples\Control Loop Library\1.0.0.0\ FilterSample.project"

BR
Edwin


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PostPosted: Thu Nov 28, 2019 3:21 am 
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Joined: Wed Aug 14, 2019 2:26 am
Posts: 5
Hi,

Thank you for the kindness reply.
I have downloaded and installed the Control Loop package. I also have a look at the examples as you mentioned in the folder.

The thing is, if I created a new project, how do I open/call out/use the control loop package? Do I use the Library Manager? I couldn't find the PID controller in the toolbox area. Do I need to write a code or something?


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PostPosted: Thu Nov 28, 2019 7:15 am 
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Joined: Mon Sep 05, 2005 9:42 am
Posts: 3624
Hi,
this is quite simple,
- open/add an standard project - ( select Control Win64 or Raspberry PI if you want to login to local installed plc)then
- go to the library manager and execute 'add Library'
- use any know fb in the search field - in your case 'Controller_PID'
- select the FB -> ok

this search field is the most powerful and fastest way to add and search libraries ( even if you know only parts like PID in your case, unbeatable)
See the documentation in the library for these fb's.


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PostPosted: Thu Nov 28, 2019 10:27 am 
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Joined: Wed Aug 14, 2019 2:26 am
Posts: 5
Is normal this message always pop-out whenever I double-click?

"No source code available for this object because it is in the compiled library 'controllooplibrary, 1.0.0.0 (3s - smart software solutions gmbh)'. Do you want to browse for the original library in order to display the source code?"

Where can I get the source code?

Edit: Ok, now I get it how to call it into the program. Right click > Insert box > select controller.


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PostPosted: Mon Dec 02, 2019 5:22 am 
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Joined: Wed Aug 14, 2019 2:26 am
Posts: 5
Hi,

I have an Opto22 groov that will be use as controller in my project.
I'd like to mimic a Yokogawa controller for simple PID function.

What is the difference of the PID controller in Util library and ControlLoop library?

Do I need to purchase anyhting? Like license or libraries etc? Previously, I try to learn BACnet using codesys, but I couldn't add the Bacnet object. It wouldn't appear for selection. I've already update my codesys to latest version but still the same. Then I saw a Bacnet SL product at codesys store and thought do i need to purchase this first before I can use bacnet on codesys?

So there is a bit of confusion of how to configure using codesys, do i need to purchase or can I try run a simulation?


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PostPosted: Mon Dec 02, 2019 6:27 am 
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Joined: Mon Sep 05, 2005 9:42 am
Posts: 3624
Hi,

the difference between Util and Controler Loop library is, it is a new development,
due the fact that many users ask for more features and better documentation.

In general you need to check your used controller if there are licenses for products embedded or need to purchase then.
All product with 'SL' - Single lincense in the CODESYS store need to be licensed per plc ( in the plc) therefore you need to check additional if your selected plc does support single licensing either by runtime key or soft container.

If you have the plc, you could check the embedded license by the device reader command.

Using Bacnet is from that point special that you need additional components in the runtime system.
This I would recommend to as you manufaturer.( If these components are embedded)

You could use CODESYS without buying anything if you use the simulation or even if you use the installed plc or use and other CODESYS store 'SL' runtime.
All of the run for two hours without a icense.

BR
Edwin


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PostPosted: Tue Jan 21, 2020 2:27 am 
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Joined: Wed Aug 14, 2019 2:26 am
Posts: 5
Quote:
"No source code available for this object because it is in the compiled library 'controllooplibrary, 1.0.0.0 (3s - smart software solutions gmbh)'. Do you want to browse for the original library in order to display the source code?"


It always appear when I try to login. Where can I get the source code?


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PostPosted: Wed Jan 22, 2020 12:17 am 
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Joined: Tue Mar 26, 2019 4:28 pm
Posts: 91
That comes up when an exception has occurred in the controller.
There is no released source code for this library, and in fact for most libraries.
So do you want to search for the library? You will have to answer "No".
How can you track down the error? While online to the faulted controller, hit View > Call Stack. You should then be able to distinguish between what part of the stack is in the compiled library and which part is in your project.
You will of course find an example project and .chm help file in the %USERPROFILE%\CODESYS Examples\Control Loop Library\ directory.

more on the call stack function here:
https://help.codesys.com/webapp/_cds_cm ... n=3.5.15.0

you can also analyze this later by taking a core dump and loading it into the ide later.
https://help.codesys.com/webapp/_cds_us ... n=3.5.15.0


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