Hi,
Good to hear.
The transition of the arduino to PLC type industrial environment is puzzling in that instance, they label the terminals on their contollino but do not set their library up to dictate those pin numbers in the software you are going to write.
You would have to do
byte D0Pin = 4;
byte D1Pin = 5;
byte D2Pin = etc etc
Or suitable Pin names.
Then use the variable names as you do in normal code.
It is bad show actually not to use that nomenclature in their example code.
Opps they do, look at this example from Library Examples.
#include <Controllino.h> /* Usage of CONTROLLINO library allows you to use CONTROLLINO_xx aliases in your sketch. */
/*
CONTROLLINO - Blinking_LEDs, Version 01.00
Turns on and off digital outputs of CONTROLLINO, which also blinks with CONTROLLINO´s status LEDs for the outputs.
IMPORTANT INFORMATION!
Please, select proper target board in Tools->Board->Controllino MINI/MAXI/MEGA before Upload to your CONTROLLINO.
(Please, refer to https://github.com/CONTROLLINO-PLC/CONTROLLINO_Library if you do not see the CONTROLLINOs in the Arduino IDE menu Tools->Board.)
This example sketch does not require any additional parts, equipment, wires or power supply. Just your CONTROLLINO, USB cable (type A-B) and a PC.
Created 8 Dec 2016
by Lukas
https://controllino.biz/
(Check https://github.com/CONTROLLINO-PLC/CONTROLLINO_Library for the latest CONTROLLINO related software stuff.)
*/
// the setup function runs once when you press reset (CONTROLLINO RST button) or connect the CONTROLLINO to the PC
void setup() {
// initialize all used digital output pins as outputs
pinMode(CONTROLLINO_D0, OUTPUT);
pinMode(CONTROLLINO_D1, OUTPUT); // note that we are using CONTROLLINO aliases for the digital outputs
pinMode(CONTROLLINO_D2, OUTPUT);
pinMode(CONTROLLINO_D3, OUTPUT); // the alias is always like CONTROLLINO_
pinMode(CONTROLLINO_D4, OUTPUT); // and the digital output label as you can see at the CONTROLLINO device
pinMode(CONTROLLINO_D5, OUTPUT); // next to the digital output screw terminal
pinMode(CONTROLLINO_D6, OUTPUT);
pinMode(CONTROLLINO_D7, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
digitalWrite(CONTROLLINO_D0, HIGH); // turn the LED on (HIGH is the voltage level)
delay(100); // wait for 100 milliseconds which is 1/10 of a second
digitalWrite(CONTROLLINO_D0, LOW); // turn the LED off by making the voltage LOW
delay(100); // wait for 100 milliseconds which is 1/10 of a second
digitalWrite(CONTROLLINO_D1, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D1, LOW);
delay(100);
digitalWrite(CONTROLLINO_D2, HIGH); // please, visit https://controllino.biz/downloads/
delay(100); // if you want to know more about the mapping of the CONTROLLINO
digitalWrite(CONTROLLINO_D2, LOW); // digital outputs to the Arduino pins
delay(100);
digitalWrite(CONTROLLINO_D3, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D3, LOW); // by using CONTROLLINO aliases instead of Arduino pin numbers
delay(100); // you ensure sketch portability between all CONTROLLINO variants
digitalWrite(CONTROLLINO_D4, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D4, LOW);
delay(100);
digitalWrite(CONTROLLINO_D5, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D5, LOW);
delay(100);
digitalWrite(CONTROLLINO_D6, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D6, LOW);
delay(100);
digitalWrite(CONTROLLINO_D7, HIGH);
delay(100);
digitalWrite(CONTROLLINO_D7, LOW);
delay(100);
}
/* End of the example. Visit us at https://controllino.biz/ or contact us at info@controllino.biz if you have any questions or troubles. */
/* 2016-12-13: The sketch was successfully tested with Arduino 1.6.13, Controllino Library 1.0.0 and CONTROLLINO MINI, MAXI and MEGA. */
"CONTROLLINO_D0" is a reserved variable name.
Using those pin names would have fixed your problem instantly.
Tom... 
