PLC programming using TwinCAT 3 - TwinCAT functions (Part 12/18)

[@JakobSagatowski]

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[@hannahthoreson8937]

I always feel so bad for people who make these type of tutorials bc the first couple of videos will have 1000 likes and comments and then the last ones are just as much work to create but nobody gets that far. Thanks for providing such a great resource.

[@Josempe1]

Jacob, I agree with you, when we have fun, time passes quickly. I am having fun and learning a lot from your videos. Excellent work. Thanks for everything, again 😁 Greetings from Venezuela

[@JakobSagatowski]

Thanks Josempe!

[@soulrobotics]

Impressive. I was developing a UDP protocol for a Siemens S7-12xx and was great. Then I have receive a request to do the same in Beckhoff. You have no idea the joy to see this chapter 12 from the beginning to the end! You underestimate our “boring threshold”. I always look up the wireshark to peak into the protocol I am writing. Sniffing with that tool make a huge difference in developing time. I saw that you pick Modbus TCP/IP. In my case I find out that the library that contains UDP is TF6311 let’s try. Big Thanks for this series!

[@JakobSagatowski]

Happy that this episode was useful for you! 😊 Hope TF6311 works out well for you. I've used it in a couple of projects and it's great! (performance is very good)

[@soulrobotics]

@@JakobSagatowski do you know if there is something similar in twincat 2? ... or if i can program some UDP basic protocol?

[@JakobSagatowski]

@@soulrobotics Hi! No, Tc2 only has the non-realtime version TS6310 available. I'm not sure if this only provides TCP but also UDP though.

[@sanoopgr8]

I'm a fan of your state machines. Simple, clean and very much maintainable. Thanks for yet another great !!!

[@JakobSagatowski]

Glad you like them! Thanks for supporting this channel

[@gordonjones3183]

Awesome tutorial series - very, very helpful - and nothing else available out there even comes close!

[@JakobSagatowski]

Thanks Gordon! I'm happy you find my work useful!

[@tiagoemanuelmonteiro7509]

Been assisting every episode of this series. Incredible job Jakob, making young adults like me, joining in the PLC world with the best practices in mind. I hope you the best of successes in life!

[@JakobSagatowski]

Thanks Tiego!

[@TomScryleus]

Another great video by the master of PLC! Proud to be a member and support this channel. When is the livestream for members?

[@JakobSagatowski]

Thanks! I'm working on it 😊

[@donkrx7]

31:50 Actually cbLength is an input parameter, the max size of the destination buffer. The output parameter cbRead is actually the correct one for determining how many bytes were read. The documentation looks correct to me (but I haven't used this).

[@stefanhenneken217]

Great tutorial.

[@JakobSagatowski]

Thanks Stefan!

[@eduardoalarcon239]

Excellent! great explanation.

[@Fine_i_set_the_handle]

11:00 I'm with you on that, no idea why they swapped what should logically be the identities of the master and slave. There's so much unnecessary additional coding needed after you've already installed a package, modbus is an extremely old and well documented protocol all you should need to do is create the arrays and call or write to them as you would normal variables. All that extra stuff should have been handled in the background by the package.

[@iparkchen6861]

I like your videos

[@JakobSagatowski]

Thank you!

[@nadeem2nazar1]

Hi Thanks for the Video. i am using CX9020 PLC and ICP CON ET-7026 Modbus Device. I am getting Error 6. in the documentation "target port not found". I have added 502 port also in the PLC firewall. still not working .

[@Landqvist00]

Hello! I was looking through the Beckhoff documenation and saw that you can map the signals directly to a GVL, which seems alot easier than doing it the way you did. Why didnt you do it the way i described? What are the benefits with doing it the way you showed in the video?

[@JakobSagatowski]

Avoid using global variables. I will make a video about why.

[@Landqvist00]

@@JakobSagatowski my question might be to long to answer in a comment on youtube, but curiosity kills me.. could you somewhat write me a short answer to why i shouldnt use GVL? btw, thanks for the answer. We are implementing our first beckhoff system in our plant this summer so im trying to get into thing, your videos are great for this.

[@JakobSagatowski]

Happy you like my videos. If you like my content and want to have early access to new videos, please consider becoming a Patron. Thanks!

[@mosheashkenazi9766]

Hi Jakob thanks for the great stuff I have a question If i wanted to read the data from the server constantly and monitor the change in the plc For example a temperature value Should i call the read function every few milliseconds?

[@JakobSagatowski]

Hey! All you need to do is to run the state-machine in a loop continously

[@alexanderandinger4784]

Great series! Where can i find the advanced series 13-18?

[@JakobSagatowski]

Thanks. They are in the works. You can get earlier access to the videos by supporting this channel on Patreon, www.patreon.com/sagatowski.

[@Runtimevic]

hello Jakob Sagatowski, great modbus tutorial video... a question for the TF6310 | TwinCAT 3 TCP/IP, exists to send the FB_SocketSend, should we also make a small state machine like the one you have made for modbus? tahnks you, 😉 👍

[@JakobSagatowski]

Hi Victor. Yes thats correct.

[@pawemadej8589]

Hello Jakob, Is it possible to play with TwinCAT and modbus communication without having real PLC? I tried to connect cheap CH340 RS485-USB converter to TwinCAT but it. uses virtual COM port like COM5-6 and Serial Device in TwinCAT allows me to choose only from COM1-4. Any hint on this really appreciated because I didn't fount any such use case anywhere.

[@Fine_i_set_the_handle]

you can use twincat on any windows pc you have laying around and use a Arduino mega with an ethernet breakout (maybe 20$ total?) to practice modbus tcp with. Automation direct has a free modbus tcp library for their pm100 arduino based plcs that works on arduino mega, even with the library you will need some knowledge of c++ and arduino to use it though. Or just use a modbus tcp simulator like he does in the video.

[@brandonfarmer4323]

I've noticed that most TwinCAT3 programmers are divided on FB execution. I am a fan of having the FB outside of the state machine to ensure that it is always called every single scan, no matter what, then manipulating variables (like a variable to set the FB trigger) inside the state machine. It seems that you are in the other camp of executing the FB inside the state machine? The benefit of single execution is that it only gets called in a single location, and there is no duplication of the input/output variables where programmer errors could occur if something is changed. Any thoughts on this topic? Thanks again for the content!

[@JakobSagatowski]

Hey Brandon! I actually generally prefer to separate the FBs and make the calls to the body outside (or generally, skip the call to body altogether and create a CyclicUpdate()-method instead). This is generally anyway what you end up with if you do TDD, as you end up with a tree of dependencies of function blocks that you can mock. This is for sure a good topic for another series of videos, but considering how many talented Tc3 developers there are out there, I'm sure someone else could make videos about this 😊

[@JosephSalmans]

I wish I could find a video for a modbus server in twincat

[@Moerkness]

I got ads error 6 🙂 modbus server is on the other physical computer.

[@nadeem2nazar1]

i am also getting same error 6 .i am using Modbus Device ICP Con ET-7026 .