Schneider Electric (Telemecanique) TWDLCDA24DRF

The Schneider Electric (Telemecanique) TWDLCDA24DRF is a compact, “all-in-one” PLC (Programmable Logic Controller) from the Twido Compact range.

The “24” in the model name indicates it has 24 integrated I/O points, and the “DRF” suffix specifies that it has Relay Outputs and operates on AC Power. This model is highly popular for simple standalone machines like conveyors, pumps, and basic HVAC systems.

1. Integrated I/O Configuration

This unit is a complete controller that includes its own power supply, CPU, and a fixed set of I/O.

• Digital Inputs: 14 inputs (24V DC).

• Digital Outputs: 10 outputs (Relay type, 2A).

• Connection Type: Non-removable screw terminal blocks.

2. Technical Specifications

3. Connectivity and Ports

• Serial Port 1 (RS-485): A Mini-DIN connector for programming (using TwidoSuite) or connecting an HMI via Modbus RTU.

• Expansion Slot: One slot on the front for a “Communication Option” (like a second RS-485 port or an RS-232 port).

• I/O Expansion: Supports up to 4 expansion modules (TM2 series) connected to the right side of the unit.

4. Wiring and Power

The TWDLCDA24DRF is unique because it provides its own power for external sensors:

• Sensor Power Supply: It features a built-in 24V DC output (limited to ~250mA). You can use this to power your proximity sensors or limit switches directly from the PLC terminals.

• Relay Outputs: Because these are mechanical relays, you can switch different voltages on different outputs (e.g., Output 0 switching 24V DC and Output 1 switching 230V AC).

5. Key Advantages

• Ease of Use: No external power supply module is required; you plug it directly into a wall outlet or control transformer.

• Versatility: Relay outputs allow you to drive small motors, contactors, or lights without needing external interposing relays.