How to Use Smart Relay Zelio SR3B261BD: Examples, Pinouts, and Specs

Introduction

The Smart Relay Zelio SR3B261BD by Schneider Electric is a versatile programmable relay designed for automation applications. It features multiple input/output configurations, built-in communication capabilities, and user-friendly programming options. This relay is ideal for controlling electrical devices in industrial, commercial, and residential settings. Its compact design and robust functionality make it a popular choice for applications requiring efficient and reliable automation.

Explore Projects Built with Smart Relay Zelio SR3B261BD

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!

ESP32C3-Based Smart AC Light Controller with Voltage Sensing

This circuit appears to be a smart AC power control system. The XIAO ESP32C3 microcontroller is used to monitor AC voltage through the ZMPT101B module and to control a 12v Relay, which in turn switches an AC Bulb on or off. The Mini AC-DC module provides the 5V power required by the microcontroller and the relay, while the AC Wire provides the AC power to the system.

Open Project in Cirkit Designer

ESP32-S3 Based Smart IoT Distance Sensor with Ethernet Connectivity

This circuit features an ESP32-S3 microcontroller interfaced with a KY-019 Relay module, a VL53L1X time-of-flight sensor, and a W5500 Ethernet module. The ESP32-S3 controls the relay and communicates with the VL53L1X sensor via I2C, as well as with the network through the Ethernet module. An AC source is converted to DC for powering the components, and a micro USB connection is used to trigger the relay.

Open Project in Cirkit Designer

ESP32-Controlled AC Lighting System with Power Monitoring

This circuit features an ESP32 microcontroller interfaced with a PZEM004T power monitoring module and a 4-channel relay module controlling multiple AC LED bulbs. The ESP32 uses GPIO pins to control the relays, which in turn switch the LED bulbs on and off. The PZEM004T is connected to the ESP32 for communication and to a current sensor for monitoring power consumption of the connected load through the relay contacts.

Open Project in Cirkit Designer

NFC-Enabled Access Control System with Time Logging

This circuit is designed for access control with time tracking capabilities. It features an NFC/RFID reader for authentication, an RTC module (DS3231) for real-time clock functionality, and an OLED display for user interaction. A 12V relay controls a magnetic lock, which is activated upon successful NFC/RFID authentication, and a button switch is likely used for manual operation or input. The T8_S3 microcontroller serves as the central processing unit, interfacing with the NFC/RFID reader, RTC, OLED, and relay to manage the access control logic.

Open Project in Cirkit Designer

Common Applications and Use Cases

• Industrial machinery control
• Building automation systems
• Lighting control
• HVAC (Heating, Ventilation, and Air Conditioning) systems
• Small-scale process automation
• Motor and pump control

Technical Specifications

Key Technical Details

Pin Configuration and Descriptions

The Zelio SR3B261BD has a total of 26 terminals, including input, output, and power connections. Below is the pin configuration:

Input Terminals

Output Terminals

Power and Communication Terminals

Usage Instructions

How to Use the Component in a Circuit

1. Power Connection: Connect a 24 V DC power supply to the L+ and L- terminals. Ensure the power supply is stable and within the specified voltage range.
2. Input Connections: Connect sensors, switches, or other input devices to the input terminals (I1 to I16). Ensure the input devices are compatible with 24 V DC logic.
3. Output Connections: Connect the devices you want to control (e.g., motors, lights) to the output terminals (Q1 to Q10). Verify that the load does not exceed the maximum current rating of 8 A per relay.
4. Programming: Use Schneider Electric's Zelio Soft software to program the relay. You can create control logic using Ladder Logic or Function Block Diagram (FBD).
5. Communication: If required, connect the RS485 communication lines (A and B) to integrate the relay into a Modbus RTU network.

Important Considerations and Best Practices

• Always verify the power supply voltage and polarity before powering the relay.
• Use proper fuses or circuit breakers to protect the relay and connected devices.
• Avoid exceeding the maximum current rating of the relay outputs to prevent damage.
• Ensure proper grounding of the system to minimize electrical noise and interference.
• Use shielded cables for RS485 communication to improve signal integrity.
• Regularly inspect and maintain the relay to ensure reliable operation.

Example Code for Arduino UNO Integration

The Zelio SR3B261BD can communicate with an Arduino UNO via Modbus RTU. Below is an example code snippet to read input status and control outputs:

#include <ModbusMaster.h>

// Create ModbusMaster object
ModbusMaster node;

// Define RS485 communication pins
#define RE_PIN 2  // Receiver Enable
#define DE_PIN 3  // Driver Enable

void preTransmission() {
  digitalWrite(RE_PIN, HIGH); // Enable transmission
  digitalWrite(DE_PIN, HIGH);
}

void postTransmission() {
  digitalWrite(RE_PIN, LOW);  // Disable transmission
  digitalWrite(DE_PIN, LOW);
}

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Initialize RS485 control pins
  pinMode(RE_PIN, OUTPUT);
  pinMode(DE_PIN, OUTPUT);
  digitalWrite(RE_PIN, LOW);
  digitalWrite(DE_PIN, LOW);

  // Initialize Modbus communication
  node.begin(1, Serial); // Slave ID = 1
  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
}

void loop() {
  uint8_t result;
  uint16_t data;

  // Read input status (e.g., I1)
  result = node.readDiscreteInputs(0x0000, 16); // Read 16 inputs starting at 0x0000
  if (result == node.ku8MBSuccess) {
    data = node.getResponseBuffer(0);
    Serial.print("Input Status: ");
    Serial.println(data, BIN); // Print input status in binary
  }

  // Write to output (e.g., Q1)
  result = node.writeSingleCoil(0x0000, 1); // Set Q1 to ON
  if (result == node.ku8MBSuccess) {
    Serial.println("Output Q1 turned ON");
  }

  delay(1000); // Wait for 1 second
}

Notes:

• Use an RS485-to-TTL converter to connect the Arduino UNO to the Zelio relay.
• Adjust the slave ID and register addresses based on your specific configuration.

Troubleshooting and FAQs

Common Issues and Solutions

1. Relay Does Not Power On

   • Verify the power supply voltage and polarity.
   • Check for loose or damaged connections.

2. Inputs Not Detected

   • Ensure the input devices are functioning correctly.
   • Verify that the input voltage is within the specified range (24 V DC).

3. Outputs Not Activating

   • Check the load connected to the output terminals.
   • Ensure the load does not exceed the maximum current rating of 8 A.
   • Verify the control logic in the program.

4. Communication Failure

   • Check the RS485 wiring and ensure proper termination.
   • Verify the Modbus slave ID and baud rate settings.
   • Use shielded cables to reduce electrical noise.

FAQs

Q: Can the Zelio SR3B261BD be used with AC loads?
A: Yes, the relay outputs can control AC loads, but ensure the load current and voltage are within the relay's specifications.

Q: What software is required for programming?
A: Schneider Electric's Zelio Soft software is used for programming the relay.

Q: Can the relay be mounted on a DIN rail?
A: Yes, the Zelio SR3B261BD supports both DIN rail and panel mounting.

Q: Is the relay compatible with other PLCs?
A: Yes, the relay can communicate with other PLCs via Modbus RTU.

Q: How do I reset the relay to factory settings?
A: Refer to the Zelio Soft software manual for instructions on performing a factory reset.