Schneider Electric TWDLCAA24DRF – Twido Compact Base Controller, 24 I/O, 100-240V AC

The TWDLCAA24DRF is a compact base controller in the Schneider Electric Twido range. It runs on 100-240V AC supply and offers 14 DC inputs plus 10 relay outputs. Engineers choose it for small machines and stand-alone panels. It expands with up to 4 I/O modules and reaches 88 I/O points. The built-in RS485 port speaks Modbus RTU/ASCII at 38.4 kbit/s.

Summary

• The TWDLCAA24DRF packs 24 discrete I/O into a DIN-rail base unit with AC power built in.
• Four expansion slots let one controller grow to 88 I/O points without changing the CPU.
• Relay outputs switch 2A loads at 240V AC, so you can drive contactors and valves directly.
• The 3000-instruction memory and 1ms scan speed cover logic, timing and counting tasks.
• Modbus master/slave on RS485 links the PLC to drives, meters and HMIs out of the box.

Core Selling Points

• All-in-one design: The base unit carries the CPU, power supply and I/O on one compact body.
• Wide AC supply: The input accepts 85-264V AC, which covers most global mains networks.
• Strong relay life: Relay contacts last 20 million mechanical cycles and 100,000 electrical cycles.
• Fast counting: Three 16-bit counters reach 5000Hz, and one 32-bit counter reaches 20000Hz.
• Built-in sensor power: A 24V DC output delivers 0.25A for field sensors and switches.
• PID and events: The firmware includes PID loops and event processing for simple process control.

Technical Specifications

• Brand: Schneider Electric
• Model: TWDLCAA24DRF
• Category: Compact Base Controller / Twido PLC
• Supply voltage: 100-240V AC; limits 85-264V
• Mains frequency: 50/60Hz; limits 47-63Hz
• Power consumption: 40VA at 264V; 33VA at 100V
• Inrush current: ≤40A
• Input current draw: 450mA
• Discrete inputs: 14 DC inputs, sink or source logic
• Input voltage: 24V DC; limits 20.4-28.8V
• Input current: 7mA on I0.2-I0.13; 11mA on I0.0-I0.1
• Input impedance: 3400 Ohm on I0.2-I0.13; 2100 Ohm on I0.0-I0.1
• Filter time: 35-45µs on I0.0-I0.5; 40-150µs on I0.6-I0.13
• Discrete outputs: 10 relay outputs
• Load current: 2A at 30V DC or 240V AC, resistive or inductive
• Minimum load: 0.1mA
• Contact resistance: ≤30000 µOhm
• Mechanical durability: ≥20,000,000 cycles
• Electrical durability: ≥100,000 cycles
• Isolation: 1500Vrms for 1 minute between channel and logic
• Insulation resistance: >10 MOhm at 500V to earth
• Program memory: 3000 instructions
• Scan speed: 1ms per 1K instructions; 0.5ms system overhead
• Internal words: 3000 words, 256 bits, 128 timers, 128 counters
• Data backup: Internal RAM with lithium cell, 30 days retention
• Battery life: 10 years; charging time 10 hours
• Expansion: 4 I/O modules; up to 88 I/O points
• Free slots: 1 slot for memory or realtime clock cartridge
• Integrated port: RS485 half duplex, Modbus RTU/ASCII, 38.4 kbit/s
• Counter inputs: 3 x 5000Hz (16-bit); 1 x 20000Hz (32-bit)
• Analogue adjustment: 1 point from 0-1023; 1 point from 0-511
• Sensor supply: 24V DC, 0.25A
• Protection: Internal fuse on power input
• Status LEDs: PWR, RUN, ERR, STAT and per-channel I/O lights
• I/O connection: Non-removable screw terminal block
• Dimensions: 90mm wide x 95mm high x 70mm deep
• Weight: 0.305kg
• Operating temperature: 0-55°C
• Storage temperature: -25-70°C
• Relative humidity: 30-95% without condensation
• Operating altitude: 0-2000m; storage 0-3000m
• Vibration resistance: 4gn at 25-100Hz on panel; 1gn at 57-150Hz on DIN rail
• Shock resistance: 15gn for 11ms
• Microbreak immunity: 10ms
• IP degree: IP20
• Marking / certifications: CE, CSA, UL

Performance and Environment

• Measurement range: The DC input window spans 20.4-28.8V and matches standard 24V field devices.
• Response speed: Input filters run from 35µs to 150µs, so fast sensor pulses still register.
• Counting accuracy: The 32-bit counter handles 20000Hz pulses without losing counts.
• Noise immunity: 1500Vrms channel isolation and 10ms microbreak immunity protect logic during dips.
• Environment tolerance: The 0-55°C range and IP20 housing suit cabinet mounting in most plants.
• Altitude range: Operation holds to 2000m, which covers most industrial sites worldwide.

Installation Guide

• Clip the base unit onto a 35mm symmetrical DIN rail or fix it to a panel plate.
• Wire mains to the supply terminals and keep the internal fuse in place.
• Connect 24V DC sensors to the built-in 0.25A sensor supply output.
• Use the non-removable screw terminals for all input and output field wiring.
• Add up to 4 expansion modules when the project needs more I/O points.
• Plug the RS485 cable into the mini DIN port for Modbus communication.

Package Contents

• 1 x Schneider Electric TWDLCAA24DRF compact base controller
• 1 x Terminal label sheet
• 1 x Product documentation sheet

Warranty and Shipping

• We cover the controller with a 12-month warranty against manufacturing defects.
• We ship by FedEx, UPS or DHL depending on destination and service level.
• Each unit packs in anti-static wrap and a protective carton.

FAQ

• Q: How many I/O points can the TWDLCAA24DRF reach with expansion?
  A: It grows to 88 points with 4 removable-terminal modules, or 152 points with HE-10 connectors.
• Q: Does the controller keep its program after a power cut?
  A: A lithium-backed RAM keeps data for 30 days, and the battery lasts about 10 years.
• Q: Can the relay outputs drive a contactor coil directly?
  A: Yes. Each relay switches 2A at 240V AC for resistive and inductive loads.
• Q: What communication protocol does the built-in port use?
  A: The RS485 port runs Modbus RTU or ASCII as master or slave at 38.4 kbit/s.
• Q: Which cartridge fits the free slot?
  A: The slot takes a memory cartridge or a realtime clock cartridge.

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