Basics 04: OpenPLC on Raspberry Pi with Modbus

On Basics 04 you will learn how to program a Raspberry Pi using OpenPLC Editor. We will also explore how to remote control the Pi's GPIO pins over Modbus TCP.
Starting the runtime 01:20
Start-stop circuit 02:40
Wiring 04:23
Create a new project 07:00
Upload to Raspberry Pi 12:11
Testing 14:07
Remote control over Modbus 15:05
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[@kennyking6325]

Friends, Years ago, I was gifted an Arduino starter kit, but I never started program at it because I’m scared of scripting. This is bringing those barriers down! Thank you

[@kennyking6325]

With plc5 addressing location 126:5 would be node 1, chassis 2, slot 6, terminal 5 . Those units were gigantic! Thank you

[@hugosilva5253]

Esse tipo de conteúdo no formato vídeo aula facilita demais a difusão do conhecimento. Ficou excelente!!! Parabéns 👏👏👏

[@gurkancekic9057]

i installed on Debian11. now no problem. maybe needed some trick for Fedora.thank you for this project.

[@openplc]

Should work just fine on Fedora too.

[@farmsidney]

Eu adorei. Já sou entusiasta do ScadaBR faz anos. Com ele conheci o projeto OpenPLC do prof. Tiago, que passa a ser referência entre nós. Grato de mais.

[@daveschwarz5279]

Interesting project save’s a load of money in learning ladder logic

[@carlosmarciosfreitas]

Fantastic project!!!!!!!!

[@guymartialdivakou3861]

Very great job...

[@antoniodias2776]

Exelente aula.

[@geertvancompernolle2586]

Fantastic explanation about cooperation between RPi and OpenPLC, great job! Question about your remark where you initially changed the outputs to %QX99.0 (video: 16:33) for the ModBus approach to be out of the known RPi range and then reverted it back to %QX0.1 for, what you said, "ease of work later on". Should you have kept %QX99.0, would that have meant you had to change the Address field in the Radzio simulator to 99 instead of 0 (video: 19:20)? Would that have been the only change?

[@openplc]

If I had used %QX99.0 then the modbus coil address would be 99*8+0 = 792. Remember that the modbus coil addressing is sequential (1,2,3,4,5,6,7,8,9,10...) while PLC discrete addressing goes in bytes (...0.6, 0.7, 1.0, 1.1 ...). That's why you need to use that little formula to convert between addresses, and that's why I went back to %QX0.1 because it is much simpler to calculate: 0*8+1 = 1.

[@ahmedechoo22]

Thank you ! for very nice video.Can i using this program for programming GMTCNT ?

[@openplc]

As far as I understand that is a proprietary platform. OpenPLC can only program open source hardware

[@ronalerquinigoagurto555]

is the runtime hard real time?

[@gurkancekic9057]

Hello i installed on Fedora. and it is working thank you.

[@carol-lo]

Thanks for great tutorial. Would OpenPLC runtime be able to be operated in Raspberry Pi Pico? Hope it could and there will be tutorials soon.

[@openplc]

Yes, there is a micro runtime for the Pico

[@ashif7542]

I have made a project which is used for testing hydraulic power pack by control of solenoid valve. There in the project i have used arduino mega and depending on the hydraulic machine i have to change the program for that i have used openplc software but the problem is i have to carry my laptop all the time. So I have an idea that I will use Raspberry Pi in which I will install windows and after that I will download and install OpenPLC software and program Arduino with OpenPLC inside Raspberry Pi. so want to know is it possible or not.

[@openplc]

OpenPLC Runtime works on Arduino boards independently. It does not require another host machine. You can unplug your PC and leave the runtime running on the board just fine.

[@ruslan.zhumabai]

Openplc is cool, but acting a modbus protocol via the website is not standard. Is it possible that situation do via a separate block inside the program?

[@openplc]

Not yet. This will be implemented in the future

[@momzeemix9033]

hi open plc hownto availp your tshirt?

[@rylotrvl8382]

Would it be possible to use OpenPLC and a raspberry pi to act as just a read / write register and how would you go about doing that. Also would OpenPLC and the Pi show up as a PLC and RTU to software like claroty or is it just going to see a windows machine and Linux.

[@openplc]

By default OpenPLC runs a Modbus server service, so yes, it can work as a simple Modbus device on the network. Clarity and other OT scan tools will identify it as whatever machine you installed OpenPLC on (Linux box, raspberry Pi, etc)

[@RobertCravenIV]

does 64bit raspbian or 32bit raspbian matter? Minimal OS install or doesn't matter for PLC performance?

[@RobertCravenIV]

(for a Raspberry Pi 4)

[@serviceteam8408]

Hello , great tutotrial , we would like to use this platform for school teaching, and we are evaluating the platform .! donations will also follow .. so that the project will grow more and more .! we would have a question : but once you load the project in the controller , you must always have the software open and in Run , or you can use it in Standalone ..! (without connections to the PC , with any Controller either ex. Arduino ? RPi 2/3/4 ...) thanks for the answers greetings from Central Europe

[@openplc]

OpenPLC Runtime is completely standalone on both the Raspbery Pi and the Arduino boards. However, you can also link two boards together making one master and the other slave. In that scenario the slave board is dependent on the master to run.

[@Llop66]

At the end of the video, it's a shame you didn't show the LED ON and OFF remotely controlled through MODBUS with RADZIO. Good video anyway !

[@aldob5681]

"there is a little problem". for such a simple example? is not going to be an easy journey. as a traditional programmer this ladder paradigm is un-natural.

[@eamonhannon1103]

Bad explanation of the Load switch !

[@Ashatechdotcom]

But, sir, do you mean, i can build a simple PLC with Raspberry pi?

[@D3rron08]

Yes

[@CharlieBooker-gr7bj]

Very powerful programming tool. Absolutely love it. Only complaint is the industrial style processors I use which are compatible are a bit pricey. Which of course OpenPLC has zero control of. But OpenPLC is freaking awesome by itself!

[@miladinseratlic5984]

Analogs IO available ?!

[@openplc]

OpenPLC supports analog IOs, you just need to pick a platform that has them. Unfortunately Raspberry Pi has no analog GPIO pin, so you will have to use a slave device or switch to another platform.

[@thanhlephuong7687]

Many thanks!

[@qk-techsmartautomationsolu3552]

Is it possible to add softmotion into this openplc software? Has anyone done it and can you give me some information?

[@openplc]

Yes, but it is not simple. Take a look at this post: openplc.discussion.community/post/ethercat-servo-drive-control-using-openplc-and-raspberry-pi-12769229?trail=15

[@yunesrahem2715]

If i add more GPIO thorough a multiplexer can i program it on openplc ?

[@openplc]

Yes, but you would have to write support for that on PSM

[@varunnand6065]

there is no way that raspberry crap is IOT compliant … no one is letting you wire that garbage into their factory's distribution board