Smart Relay

Categories:
Stand Alone Controllers

Description

A Universal Controller, also known as a Smart Relay, is a small, programmable logic device designed for controlling and automating small to medium-sized systems. It combines the functions of timers, counters, relays, and logic controllers into a single unit. Smart relays are often used in HVAC systems, building automation, water pump controls, lighting, and simple industrial machinery.

These controllers allow users to configure logic operations using either a built-in display or PC software. Unlike full PLCs (Programmable Logic Controllers), smart relays are simpler, cost-effective, and ideal for basic automation and control needs.

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Specifications

  • Inputs and Outputs:

    • Digital inputs: 4 to 20 (depending on model)

    • Analog inputs: Optional in advanced models

    • Relay or transistor outputs: 4 to 10 channels

    • Expandable I/O modules for larger applications

  • Power Supply:

    • 12V DC, 24V DC, or 230V AC (model-dependent)

  • Programming:

    • Ladder Logic or Function Block Diagram (FBD)

    • Configurable via front panel buttons or PC software (USB, Ethernet, or Bluetooth interface)

  • Display:

    • Built-in LCD for status, programming, and real-time monitoring

    • LED indicators for input/output states

  • Communication Protocols (optional based on model):

    • Modbus RTU, Modbus TCP, Ethernet, or proprietary protocols

    • Some models support remote access via web server or mobile app

  • Timers and Counters:

    • On-delay, off-delay, pulse, weekly scheduler, and more

    • Multi-function counters for event tracking

  • Memory:

    • Non-volatile memory stores programs during power loss

    • Typical program size supports up to 200 function blocks or logic steps

  • Mounting:

    • DIN rail or panel-mounted installation

  • Operating Environment:

    • Temperature range: -20°C to +55°C

    • Protection class: IP20 or IP40 (standard); higher with enclosure

  • Typical Applications:

    • HVAC fan and pump control

    • Lighting automation

    • Simple machine sequence control

    • Water level and tank management

    • Time-based automation (e.g., gate, signage, garden systems)

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