Schneider TM221C40T Transistor PLC 24V DC 40 I/O

Modicon M221 TM221C40T Controller – 24V DC Transistor Output

Product Introduction

The Schneider Electric TM221C40T belongs to the Modicon M221 family of compact logic controllers. This version operates on a 24 V DC power supply and features transistor outputs for high-speed switching applications. It is specifically designed for motion control, positioning, and pulse-width modulation tasks.

With 40 built-in I/O points, this controller handles complex automation requirements without needing extensive expansion. The transistor outputs provide faster response times than relay versions, making the TM221C40T suitable for applications requiring precise timing and frequent switching cycles.

Technical Specifications

The TM221C40T includes 24 discrete inputs, with 4 of them configured as fast inputs for high-speed counting. These inputs comply with IEC 61131-2 Type 1 standards and support both sink and source logic. Additionally, the unit provides 2 analog inputs with a 0...10 V range and 10-bit resolution.

For output control, this controller offers 16 transistor outputs rated at 0.5 A each with a 24 V DC output voltage. Among these, 2 fast outputs (Q0 and Q1) support 100 kHz operation in PWM or PLS mode, while outputs Q2 and Q3 run at 5 kHz. The remaining outputs operate at 0.1 kHz.

The built-in memory includes 256 kB for user applications and data RAM, plus another 256 kB for internal variables. A flash memory backup preserves your application and data automatically. You can also expand storage using an optional 2 GB SD card.

Processing is remarkably fast, with Boolean instruction execution taking just 0.2 µs. A 1K instruction task completes within 0.3 ms. The controller supports 14 simultaneous PID regulation loops and includes a real-time clock with minimal drift.

Positioning and Motion Control

A key advantage of the TM221C40T is its built-in positioning capability. It supports 2 axes of PTO (Pulse Train Output) in pulse/direction mode at 100 kHz, or 1 axis in CW/CCW mode. This makes the controller an excellent choice for simple servo and stepper motor applications.

The 4 fast inputs support high-speed counting up to 100 kHz in single-phase, pulse/direction, or A/B modes. Additionally, the controller features PWM (Pulse Width Modulation), PLS (Pulse), and frequency generator functions, providing versatile motion control options.

Communication and Connectivity

For programming and monitoring, the TM221C40T includes a mini B USB 2.0 port operating at 480 Mbit/s. Two non-isolated serial links are available: one RS485 port and one RS232/RS485 combo port, both using RJ45 connectors. These support Modbus RTU/ASCII protocols in master or slave mode.

The serial transmission rates range from 1.2 to 115.2 kbit/s, enabling flexible integration with HMIs, drives, and SCADA systems. The USB port provides a convenient connection for programming with SoMachine software.

Protection and Durability

The transistor outputs feature overload and short-circuit protection at 1 A with automatic reset after 1 second. This protection safeguards both the controller and connected devices from damage during fault conditions.

The mechanical durability of the transistor outputs exceeds 20 million cycles, significantly outlasting relay-based alternatives. The leakage current is only 0.1 mA, and the voltage drop remains below 1 V, ensuring efficient power delivery to connected loads.

Mechanical and Environmental Specifications

This logic controller measures 160 mm wide, 90 mm high, and 70 mm deep, weighing just 0.456 kg. It mounts on standard TH35-7.5 or TH35-15 DIN rails, or directly on a panel using an optional fixing kit.

The operating temperature range is -10...55 °C for horizontal mounting and -10...35 °C for vertical installation. Storage temperatures span from -25 to 70 °C. The unit maintains full functionality in 10...95 % relative humidity without condensation.

With an IP20 protection rating, the TM221C40T suits ordinary and hazardous locations. It carries multiple marine certifications, including ABS, LR, and DNV-GL, along with CE, CSA, and UL marks.

Immunity and Compliance

The controller meets stringent EMC standards. Electrostatic discharge immunity reaches 4 kV contact and 8 kV air per IEC 61000-4-2. Radiated field immunity is rated at 10 V/m from 80 MHz to 1 GHz.

For conducted disturbances, it withstands 10 Vrms from 0.15 to 80 MHz. Surge immunity is 2 kV common mode on AC power lines and relay outputs. Conducted emissions comply with EN/IEC 55011 Class A limits for industrial environments.

Power line microbreaks up to 10 ms do not affect operation, ensuring stable performance during momentary grid fluctuations. The shock resistance rating of 147 m/s² makes it suitable for vibration-prone environments.

Installation Guide

Follow these steps for proper installation:

1. Mounting: Secure the controller on a DIN rail or panel using the integrated clips. Ensure adequate clearance for ventilation and cable routing.

2. Wiring: Connect the 24 V DC supply to the 3-terminal block. Use shielded cables for fast inputs (max 10 m) and fast outputs (max 3 m). For digital I/O, unshielded cables up to 30 m are acceptable. Keep analog input cables under 1 m to maintain signal integrity.

3. Expansion: Attach up to 7 relay output modules to the expansion bus. Power is automatically supplied from the main unit.

4. Communication: Connect programming devices via USB or serial links. Set the transmission rate according to your network requirements.

5. Configuration: Use SoMachine or EcoStruxure Machine Expert – Basic software to program the controller. Both tools support all object areas, including 512 %M bits, 8000 %MW words, and 255 timers/counters.

Packaging List

• TM221C40T logic controller (1 unit)

• Removable screw terminal blocks for inputs and outputs

• 3-terminal power supply connector

• 4-terminal analog input connector

• DIN rail mounting clips (pre-installed)

• Quick start guide (printed)

Shipping carriers: FedEx, UPS, DHL

Frequently Asked Questions

1. What is the main difference between TM221C40T and TM221C40R?
The TM221C40T uses transistor outputs with 24 V DC and supports high-speed switching, PWM, and positioning functions. The TM221C40R uses relay outputs with AC/DC capability but lacks fast output features.

2. Can the TM221C40T control stepper motors directly?
Yes, the TM221C40T supports PTO outputs for stepper and servo drives. You can control up to 2 axes in pulse/direction mode at 100 kHz.

3. What software do I need to program this Modicon M221 controller?
Use Schneider Electric SoMachine or EcoStruxure Machine Expert – Basic. Both provide full support for the M221 series.

4. How many expansion modules can I connect to this logic controller?
The TM221C40T supports up to 7 relay output expansion modules, provided total power consumption stays within the built-in supply limits.

5. Is the real-time clock battery replaceable?
Yes, the BR2032 lithium battery is user-replaceable. It typically lasts 4 years and maintains the clock and data during power interruptions.