Basics 05: Expanding PLC IOs with OpenPLC Slave Devices

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On Basics 05: you will explore OpenPLC's Slave Devices module to expand your PLC's IOs. For this video, we will be using a Raspberry Pi, which is quite limited in number of IOs, as the main PLC running OpenPLC Runtime. The Raspberry Pi's IOs are then expanded using an Arduino Uno board connected to the Pi's USB port.
Configuring Slave Devices 01:38
Adding multiple Slaves 08:11
Configuring poll rate 10:26
Adding Arduino Uno to Raspberry Pi 11:46
Burning Arduino firmware 12:30
Writing PLC program 17:14
Testing the circuit 24:28
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Опубликовано:

3 ноя 2022

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Комментарии : 32

@kennyking6325 Год назад

Excellent Friends, would you look at this! It is truly wonderful

@sparkyy0007 3 месяца назад

Excellent explanation. Thanks for this project.

@Austiego5000 Год назад

Love the functionality! Keep up the good work!

@bandilecandrian6223 Год назад

Good content this helped in my final year project.

@giginmathew1 5 месяцев назад

Good job this is useful for project reducing cost and programming in ladder logic

@kennyking6325 Год назад

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

@remiguillonbony6528 Год назад

Hey ! Great video ! Is it possible to make the Rapsberry/Arduino system you presented at 24:33 independent from the host PC ? For example, have the OpenPLC runtime running on the Raspberry and the Arduino connected on it too, while using an battery as power supply ?

@openplc Год назад

The system is totally independent from the PC. In that case, the host is actually the Raspberry Pi itself. The PC is used only to create the PLC program and upload it to the Pi. The usb cable you see connected to the Pi is used only for power.

@EpicCalamar Год назад

Ooh I see, I thought there were two cables both connected to the PC. I didn’t catch that it was a single cable looping on itself ^^ Thanks !

@DGEsA Год назад

My question is do you have a handbook about of using openplc editor I'm interested in how to use the analog inputs in my Arduino UNO

@ahmadsakr4831 Год назад

What about shift register for inputs and outputs? I already used this Way in ldmicro , I expanded io pins to many shift registers pins only by using only 3 pins from AVR microcontroller for information ldmicro is for programming microcontroller by ladder (AVR,pic,arm,Arduino and esp)

@delackels1649 Год назад

Would it be possible to connect a USB Zigbee add-on radio and use it for inputs and outputs? Would you nee to write custom drivers or is there something already made?

@openplc Год назад

If you can make your Zigbee module talk Modbus then yes, you can

@mail87523 Год назад

It would be super cool if openplc had can-fd communication which is true real time communication with very low latency. Seed have can-fd hat for raspberry and work great but we need glue for openplc !!! SocketCAN with can-utils is also very good with can-fd and it work on raspberry

@satierkumaa 8 месяцев назад

How do I make a canbus available in the ladder diagram?

@selahattinemreduman106 Год назад

Hi, a have a question. For example can i use 2 pcs Esp32 for this method?

@openplc Год назад

Yes, you can

@lorenzocastelli3552 Год назад

There is a problem with the Arduino Mega. By adding Arduino Mega as slave we should have: 24 Discrete Inputs 24 Coils 8 Input Registers 0 Holding Register - Read 12 Holding Register - Write Instead they are automatically taken 24 Discrete Inputs 16 Coils 16 input registers 0 Holding Register - Read 12 Holding Register - Write I tried to manually add the device but every time I get the error message: "Please fill out all the fields before saving!"

@ainfirdaus11 Год назад

Interesting Can open plc monitor IOs states from editor(online)?

@openplc Год назад

Not yet. This is a feature that will come in the future

@ahmadsakr4831 Год назад

What about shift register for inputs and outputs I used this Way in ldmicro ,I can expand Io pins using many shift registers For information ldmicro is for programming microcontroller by ladder

@openplc Год назад

Shift registers are a “hardware-way” to expand IO. It is common to find them internally on many commercial PLCs. This is a more “external/software” way to expand IO using off the shelf devices. But anyway, OpenPLC can support shift registers as well, as long as the IO driver is written on a PLC block :) It might come on future versions of the Editor

@TomLeg Год назад

"slave" devices is outdated terminology, considered racist. You'll notice that the SPI protocol has renamed its MOSI and MISO leads, which used to be "Master In Slave Out" and vice versa, to PICO and POCI, "Peripheral IN, Controller OUT" and vice versa. You might want to consider updating your terminology, too.

@nilscarstensen3844 Год назад

Good to see wokeness finally arriving in harsh industrial environments. jk You will read the word slave in almost every industrial bus (CANopen, EtherCat, DeviceNet, Profibus, Modbus, aso.) documentation / software /wiki article. So i don’t think it’s that outdated ;-)

@TomLeg Год назад

@@nilscarstensen3844 so maybe SPI is leading the way, but it isn't an excuse for others to lag.

@nilscarstensen3844 Год назад

@@TomLeg change will take a while. It will really suck doing troubleshooting with a customer while using another terminology than him and the software-tool he’s using.