Schneider TWDLCAA40DRF Twido Compact Controller

TWDLCAA40DRF Compact Base Controller for Small Automation Projects

Product Introduction

The Schneider TWDLCAA40DRF serves as the core of many small to medium automation systems. This compact base controller integrates power supply, processor, and I/Os in one unit. You get 24 discrete DC inputs plus 16 discrete outputs. The output mix includes 14 relays and 2 transistors, giving you flexibility for different load types.

Furthermore, the TWDLCAA40DRF supports up to 7 I/O expansion modules. This allows you to reach a maximum of 152 I/Os with screw terminals. The controller also features a memory cartridge slot for program backup. An external battery (TSXPLP01) provides up to 3 years of data retention for internal RAM.

Power Supply and Electrical Characteristics

Rated Supply Voltage

The unit operates on a 100 to 240 V AC rated supply. Acceptable voltage limits range from 85 V to 264 V. Network frequency is 50 or 60 Hz, with limits between 47 and 63 Hz. Power consumption reaches 65 VA at 100 V and 77 VA at 264 V.

Output Power and Protection

A built-in 24 V DC sensor supply delivers 0.4 A. The input current is 790 mA, while inrush current stays below 35 A. Internal fuse provides power protection. Insulation resistance measures over 10 MOhm at 500 V between I/O and earth, as well as between supply and earth.

Isolation and Dielectric Strength

Dielectric strength reaches 1500 V for one minute between I/O and earth terminals. The same rating applies between supply and earth terminals. Insulation between channels and internal logic is 1500 Vrms for one minute. These features ensure reliable operation in industrial environments.

Discrete Input Specifications

Input Configuration

The controller includes 24 discrete DC inputs. Input voltage is rated at 24 V DC, with actual limits from 20.4 V to 26.4 V. The input logic supports sink or source wiring, giving you installation flexibility.

Input Current and Impedance

Input current varies by terminal. For terminals I0.0 to I0.1, current is 11 mA with 2100 Ohm impedance. For I0.6 to I0.7, the same 11 mA and 2100 Ohm apply. Meanwhile, I0.2 to I0.5 draw 7 mA with 3400 Ohm impedance. Terminals I0.8 to I0.23 also use 7 mA and 3400 Ohm.

Filter Times

Filter times differ based on input terminal and state. For I0.0 to I0.5 at state 1, the filter time is 35 µs plus programmed filter time. At state 0, it becomes 40 µs plus programmed filter time. For I0.6 to I0.23, state 0 uses 150 µs plus programmed filter, while state 1 uses 40 µs plus programmed filter.

Discrete Output Specifications

Output Mix

The TWDLCAA40DRF provides 16 discrete outputs in total. Specifically, you get 14 relay outputs and 2 transistor outputs. This combination allows you to drive both AC and DC loads with the relays, while transistors handle high-speed switching.

Relay Output Ratings

Each relay output handles 2 A at 240 V AC for resistive or inductive loads. The same 2 A rating applies at 30 V DC. Operating rate is 30 cycles per minute. Minimum load is 0.1 mA, and contact resistance stays below 30000 µOhm.

Output Durability

Mechanical durability exceeds 20 million cycles for relay outputs. Electrical durability reaches 100,000 cycles under rated load. These ratings ensure long-term reliability in typical industrial applications.

Communication and Programming Features

Integrated Communication Ports

The controller includes a non-isolated serial link with mini DIN connector. It supports RS232C and RS485 interfaces. Communication modes include Modbus RTU and ASCII. The controller can act as master or slave in half-duplex mode at speeds up to 38.4 kbit/s.

Memory and Processing

Program memory holds 3000 instructions. Execution time is 1 ms per 1000 instructions. System overhead adds 0.5 ms. The internal RAM stores 128 counters, 128 timers, 256 internal bits, and 3000 internal words. Double words and floating point values are also supported.

Built-in Functions

The controller includes event processing and PID functions. Additionally, it offers two PWM or PLS channels at 7 kHz. Counting inputs include two 32-bit channels at 20 kHz and four 16-bit channels at 5 kHz. Two analog adjustment points are available, with ranges of 0-1023 and 0-511.

Real-Time Clock

A real-time clock is integrated. Drift stays within 30 seconds per month. Operating time on battery backup is 30 days. This clock is useful for time-stamped events and scheduled operations.

Mechanical Dimensions and Environmental Ratings

Physical Dimensions

Length is 70 mm, width is 90 mm, and height is 95 mm. Product weight is 0.525 kg. The compact footprint saves space in control cabinets.

Environmental Conditions

Operating temperature ranges from 0°C to 55°C. Storage temperature extends from -25°C to 70°C. Relative humidity tolerance is 30% to 95% without condensation. IP20 protection rating is provided.

Certifications

The product carries CSA and UL certifications. CE marking confirms compliance with European standards.

Mechanical Robustness

Vibration resistance depends on mounting method. On DIN rail, the unit withstands 0.075 mm at 10-57 Hz and 1 gn at 57-150 Hz. On a panel with fixing kit, it handles 1.6 mm at 2-25 Hz and 4 gn at 25-100 Hz. Shock resistance reaches 15 gn for 11 ms.

Installation Guidelines for the TWDLCAA40DRF

Mounting Instructions

Mount the controller on a 35 mm symmetrical DIN rail or directly on a panel. For DIN rail mounting, ensure the rail is properly grounded. For panel mounting, use the optional fixing kit to improve vibration resistance. Allow adequate space for ventilation and wiring access.

Wiring Connections

I/O connections use non-removable screw terminal blocks. Use proper wire gauges for the rated currents. For relay outputs, consider using snubber circuits when switching inductive loads. This reduces electrical noise and extends contact life.

Expansion Module Connection

You can add up to 7 I/O expansion modules. Connect them sequentially to the right side of the base controller. Each module adds more I/O points. With all expansion slots filled, total I/O count reaches 152 for screw terminal types.

Memory Cartridge Installation

The memory cartridge slot accepts optional cartridges for program backup. Insert the cartridge carefully to avoid bending pins. Use the cartridge to store your application program or to transfer it to other Twido controllers.

Packaging List

• 1 x Schneider TWDLCAA40DRF Compact Base Controller

• 1 x Non-removable screw terminal block (pre-installed)

• 1 x Quick start guide

• 1 x Battery cover (battery TSXPLP01 sold separately)

Shipping Information

We ship worldwide using FedEx, UPS, and DHL. Tracking numbers are provided within 24 hours after dispatch.

Frequently Asked Questions (FAQ)

1. Can the TWDLCAA40DRF control both AC and DC loads?
Yes. The 14 relay outputs can switch both AC and DC voltages up to 240 V AC or 30 V DC at 2 A. The 2 transistor outputs are suitable for DC loads only and support higher speed switching.

2. What programming software is required for this controller?
TwidoSuite is the recommended software. It supports all Twido controllers including the TWDLCAA40DRF. The software allows ladder diagram and instruction list programming.

3. How do I retain data during a power loss?
Internal RAM is backed up by an external battery, model TSXPLP01. This battery provides up to 3 years of data retention. Alternatively, you can use a memory cartridge in the dedicated slot for program backup.

4. What is the maximum distance for Modbus communication?
The RS485 serial link supports communication distances up to 1,200 meters at lower baud rates. At the maximum 38.4 kbit/s, keep the cable length under 500 meters for reliable operation.

5. Can I mix sink and source inputs on this controller?
Yes. The discrete inputs support both sink and source logic. This means you can connect NPN or PNP sensors without changing hardware. Simply wire the common terminal accordingly.