Below is the Arduino sketch which was used for the video:

/* Indio Library, for Industruino - wwww.industruino.com
This library enables communication with the Industruino IND.I/O Baseboard.
The IND.I/O Baseboard has 8CH of 24V digital I/O (6.5-32V supported), 4CH 0-10V/4-20mA ADC, 2CH 0-10V/4-20mA DAC, RS485 transceiver.

WARNING!: PLEASE BE VERY CAREFUL WHEN CONNECTING PERIPHERALS TO YOUR IND.I/O AND CONFIGURING THE DIRECTION OF THE I/O.
          THE FAILURE MODE OF A 24V SHORTED CONNECTION IS MUCH MORE SPECTACULAR THAN WHEN WORKING AT 5V. 

*/
#include <Indio.h> //include IND.I/O library
#include <Class_define.h> // required for IND.I/O library
#include <Wire.h> // required for IND.I/O library
#include <UC1701.h> // include UC1701 LCD library
static UC1701 lcd; 

int inductive = 0; //integer to hold PNP inductive proximity sensor state
int capacitive = 0; //integer to hold PNP capacitive proximity sensor state
int reflective = 0; //integer to hold PNP reflective IR proximity sensor state
int var = 0; // integer to count down process length 

int ledState = LOW;             // ledState used to set the LED
long previousBlinkMillis = 0; // will store last time LED was updated
long interval = 100;           // interval at which to blink (milliseconds)

void setup()
{

  pinMode(13, OUTPUT); //set backlight pin to output
  analogWrite(13, 240); //set backlight intesity
// INDI.I/O Baseboard has 8 channels of bidirectional 24V I/O (6.5-32V supported). 
// Here we choose the direction of each I/O channel. 
    lcd.begin();
   Indio.digitalMode(1,INPUT);  // Set CH1 as an input
   Indio.digitalMode(2,INPUT);  // Set CH2 as an input
   Indio.digitalMode(3,INPUT);  // Set CH3 as an input
  
   Indio.digitalMode(6,OUTPUT);  // Set CH6 as an output
   Indio.digitalMode(7,OUTPUT);  // Set CH7 as an output
   Indio.digitalMode(8,OUTPUT);  // Set CH8 as an output
   Indio.digitalWrite(8,LOW); // Set CH8 to low (0V)
   
//print lcd header
  lcd.setCursor(0, 1); 
  lcd.print("Reflective");
  lcd.setCursor(0, 2);
  lcd.print("Capacitive");
  lcd.setCursor(0, 3);
  lcd.print("Inductive");
   
 }

void loop()
{

//test each sensor for HIGH or LOW
  if (Indio.digitalRead(1) == 1){ 
    reflective = 0;
  lcd.setCursor(64, 1);
  lcd.print("LOW ");
}

 if (Indio.digitalRead(1) == 0){ 
     reflective = 1;
  lcd.setCursor(64, 1);
  lcd.print("HIGH");
}
  
  if(Indio.digitalRead(2) == 1){
    capacitive = 1;
  lcd.setCursor(64, 2);
  lcd.print("HIGH");
  }
  
  if(Indio.digitalRead(2) == 0){
    capacitive = 0;
  lcd.setCursor(64, 2);
  lcd.print("LOW ");
  
  }

  if(Indio.digitalRead(3) == 1){
    inductive = 1;
  lcd.setCursor(64, 3);
  lcd.print("HIGH");
  }

  if(Indio.digitalRead(3) == 0){
    inductive = 0;
  lcd.setCursor(64, 3);
  lcd.print("LOW ");
  }
  
//test for combinations of sensors triggered
  if (inductive == 1 && reflective == 1) {  
  lcd.clear();
  lcd.setCursor(20, 3);
  lcd.print("Metal detected");
  lcd.setCursor(20, 5);
  lcd.print("Seperating...");
  Indio.digitalWrite(8,HIGH);
 
//flash indicator lamp and trigger solenoid for 3 seconds 
var = 0;
while(var < 30){
  
 unsigned long currentBlinkMillis = millis();
  if(currentBlinkMillis - previousBlinkMillis > interval) {
    // save the last time you blinked the LED 
    previousBlinkMillis = currentBlinkMillis;   

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    // set the LED with the ledState of the variable:
    Indio.digitalWrite(7,ledState);
     var++;
  }
  
}

//end flashing of LED and turn of solenoid
  Indio.digitalWrite(8,LOW);
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("Reflective");
  lcd.setCursor(0, 2);
  lcd.print("Capacitive");
  lcd.setCursor(0, 3);
  lcd.print("Inductive");
}

}