How to Use PUSH BUTTON - STOP: Examples, Pinouts, and Specs

The Schneider XB4-BP42 is a high-quality, industrial-grade momentary push button designed to interrupt a circuit when pressed. It is commonly used as a "STOP" button in control panels, machinery, and safety systems. This push button is part of Schneider's XB4 series, known for its durability and reliability in demanding environments.

• Emergency stop mechanisms in industrial machinery
• Control panels for automation systems
• Safety circuits in manufacturing plants
• Operator interfaces in electronic devices

The XB4-BP42 push button has a simple pin configuration, as shown below:

1. Mounting the Push Button:

   • Drill a 22mm hole in the panel where the push button will be installed.
   • Insert the push button into the hole and secure it using the mounting ring provided.

2. Wiring the Push Button:

   • Connect the COM terminal to the power source or control circuit.
   • Connect the NC terminal to the load or device you want to control.
   • Ensure all connections are secure and insulated to prevent short circuits.

3. Testing the Circuit:

   • Power on the circuit and press the push button.
   • Verify that the circuit is interrupted (stops functioning) when the button is pressed.
   • Release the button to restore the circuit.

• Ensure the push button is rated for the voltage and current of your application.
• Use proper wire gauges and connectors to handle the electrical load safely.
• Avoid exposing the push button to extreme temperatures or corrosive environments beyond its rated specifications.
• Regularly inspect the push button for wear and tear, especially in high-use applications.
• For safety-critical applications, consider using redundancy or additional safety measures.

The XB4-BP42 can be used with an Arduino UNO to detect button presses. Below is an example circuit and code:

• Connect the COM terminal of the push button to the Arduino's GND pin.
• Connect the NC terminal to a digital input pin (e.g., D2) on the Arduino.
• Use a pull-up resistor (10kΩ) between the digital input pin and 5V to ensure a stable signal.

// Define the pin connected to the push button
const int buttonPin = 2;  // Digital pin 2 for the push button

// Variable to store the button state
int buttonState = 0;

void setup() {
  // Set the button pin as input with an internal pull-up resistor
  pinMode(buttonPin, INPUT_PULLUP);

  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the state of the push button
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed (LOW state due to pull-up resistor)
  if (buttonState == LOW) {
    Serial.println("STOP button pressed!");
    // Add your stop logic here
  } else {
    Serial.println("STOP button released.");
  }

  // Small delay to debounce the button
  delay(50);
}

1. Can the XB4-BP42 be used outdoors?
   Yes, the push button is rated IP66, IP67, IP69, and IP69K, making it suitable for outdoor and harsh environments.

2. What is the difference between a momentary and latching push button?
   A momentary push button (like the XB4-BP42) only changes the circuit state while pressed. A latching button maintains its state after being pressed.

3. Can I use this push button for low-voltage applications?
   Yes, the XB4-BP42 supports a wide voltage range from 24V to 240V AC/DC, making it suitable for low-voltage circuits.

4. How do I clean the push button?
   Use a soft, damp cloth to clean the button. Avoid using abrasive materials or solvents that could damage the surface.

By following this documentation, users can effectively integrate the Schneider XB4-BP42 push button into their projects and troubleshoot common issues with ease.