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Optoisolated Inputs Mduino


In this post it is described how to use the galvanically isolated inputs in Industrial Shields PLC's (Ardbox and M-Duino).


Ethernet or 20 I/Os PLC:     Ethernet PLC       20 I/Os PLC

Industrial Shields boards:  Install Industrial Shields boards

How to connect

As shown in the Figure below, isolated inputs always have two available connections and both of these connections need to be wired for a proper performance of the inputs. The configuration if the inputs is PNP. All isolated inputs are DIGITAL,  not ANALOG.

Odoo image and text block

Ix.x    –>  Signal. Voltage up to 24V

(-) Ix.x –>  Reference or COM of the input signal.  

IMPORTANT: BOTH connections must be connected read properly.

The next piece of code shows how to read one optoisolated input. Remember to install our boards!

void setup() { 
    Serial.begin(9600); // Set up serial communication. It will allow to monitor the analog input value. } void loop() {
    delay(2000); //wait 2 seconds }

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