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Industrial Arduino based PLC programmed with LabVIEW

Introduction

In this post you are going to learn how to work with our industrial PLCs and the computer application LabVIEW.

Previous readings

We recommend you to read the following posts from our blog before reading this one.

Requeriments

In order to work with the PC application LabVIEW, you will need the following things:

  • Some electronic components such as wires, leds, resistors, potentiometers, etc.

Hardware & Software

Configuration of the switches for the digital example: 

Most of the inputs and the outputs are connected to the internal Arduino, but in few cases, the user can choose between a special peripheral configuration or a GPIO by changing the position of the Dip Switches.

Each switch can select only one of the two possible configurations at the same time. For example, in this case we are watching the configuration of an M-Duino 42+ Ethernet industrial controller. If we put the switch to the right position (ON), the digital outputs Q0.5, Q0.6 and Q0.7 will be activated, but if the switch is in the left position (OFF) we will activate the analog outputs A0.5, A0.6 and A0.7.

In this case, all of the switches have to be in the ON position.

Q0.5, Q0.6 & Q0.7 enabled - A0.5, A0.6 & A0.7 disabled


Connection between an Arduino board and LabVIEW:

First of all, you are going to look for the sketch called LIFA_Base following the steps in the first screenshot: Este equipo -- Disco local(C:) (or the letter that your local disc has) -- Archivos de programa (x86) -- National Instruments -- LabVIEW 2019 (or the version that you downloaded) -- vi.lib -- LabVIEW Interface for Arduino -- Firmware -- LIFA_Base. Once you found it click on it and an Arduino IDE window is going to pop up in your computer.

After that, go to this window and click Tools -- Board (Your PLC family) + Model (Your PLC) + Port and select your PLC Arduino family, your specific model and the serial port where it is located and transfer the code to your Industrial Shields PLC with the arrow on the top left of the screen (second icon).

 


Build the following electrical circuit:

  • The Leds can have any color. (The long leg of the leds is the positive part, which has to be connected to its resistor and the other one has to be connected to the ground pin (GND) of the PLC controller).

  • The connections can be done in any of the digital outputs of the PLC. The equivalence of the Arduino board pins with your PLC for industrial automation are in our webpage, selecting your family and model and going into the file named User Guide in the Pinout section.

  • The resistors should be of 220 Ohm.

  • There has to be a cable that connects two pins in the controller Arduino; the one called 5Vdc with the QVdc of the pins you are going to use.

  • A power supply (12-24 Vdc) is needed to power up your programmable logic controller (PLC) apart of the USB connection from it to your computer.