Schneider TM221C24T Modicon M221 24IO PNP 24V DC

The Schneider Electric TM221C24T is a compact base unit (logic controller) from the Modicon M221 series, designed for building low-cost and scalable industrial automation systems with a wired architecture. This model is a single-block PLC that integrates a central processor, power supply, discrete and analog inputs/outputs, and built-in communication ports, making it an ideal solution for controlling machines and small process lines.

This controller belongs to the TM221C series and is based on transistor outputs (PNP) and a 24 VDC supply. It is equipped with 14 discrete inputs (including 4 fast), 10 transistor outputs (including 2 fast), 2 0-10 V analog inputs, and 1 USB port for programming.

The key feature of the TM221C24T is support for SD memory cards (up to 2 GB) for program backup and firmware updates, as well as a built-in expansion cartridge slot, providing the flexibility to expand functionality without replacing the base unit. The controller is designed for operation at temperatures from -10 to +55°C (horizontal mounting) and has an IP20 protection rating.

Key Features and Benefits

Compact base unit with 24 inputs/outputs: The PLC has built-in 14 discrete inputs, 10 transistor outputs (PNP), and 2 0-10 V analog inputs. This is sufficient to control most small machines and mechanisms without the need for additional expansion modules.

High-speed channels for precise control: 4 high-speed inputs (I0, I1, I6, I7) with a 5 µs response time and 2 high-speed outputs (Q0, Q1) with frequencies up to 100 kHz support PWM, PLS, and frequency generator modes. This allows for connecting incremental encoders (A/B, single-phase, pulse/direction) and controlling servo drives, stepper motors, and high-speed counters.

Scalability with TM3 modules: The base unit can be expanded with up to 7 TM3 modules (digital, analog, and specialized) for local I/O architecture, and up to 14 modules for remote I/O architecture. The maximum number of addressable discrete I/Os reaches 264, and the number of analog I/Os reaches 114, allowing the system to grow as requirements grow.

Advanced communication capabilities: The controller is equipped with two RS-485 (RJ45) serial ports, one of which functions as a Modbus master/slave (RTU/ASCII), and the other as a Modbus master/slave or SoMachine-Network. A USB port (mini-B USB 2.0) is used for programming and PC communication. An expansion cartridge slot is also available (for example, for adding an Ethernet port), and an SD card slot (up to 2 GB) allows for firmware backup and updates.

Large memory and high performance: 256 KB of on-board RAM for applications and data, plus 256 KB for internal variables. Backup is available to the on-board Flash memory (256 KB) and an SD card. The processing time for 1K binary instructions is only 0.2 ms, ensuring high performance even with complex algorithms.

Input versatility and ease of connection: Discrete inputs support "sink" or "source" logic (positive/negative), allowing connection of both PNP and NPN sensors. The input current is 7 mA for discrete inputs and 5 mA for fast inputs.

Protection and reliability: Outputs have electronic overload and short-circuit protection with automatic reset (1 s). The inrush current is 35 A. The controller is certified by maritime registers: DNV-GL, LR, ABS, as well as CE, UL, CSA, EAC, RCM, confirming its suitability for use in shipbuilding and hazardous industrial facilities.

Specifications

Parameter Value

Catalog Number TM221C24T

Modicon M221 Series

Device Type PLC

Supply Voltage 24 VDC (20.4…28.8 V Range)

Number of Discrete Inputs 14 (including 4 fast)

Discrete Input Type Sink or Source (positive/negative logic)

Nominal Input Voltage 24 VDC

Discrete Input Current 7 mA

Fast Input Current 5 mA

Number of Discrete Outputs 10 (including 2 fast)

Discrete Output Type Transistor, PNP (positive logic)

Output Voltage 24 VDC

Output Current (per channel) 0.5 A

Max. Current per total 5 A

Number of analog inputs 2 (0-10 V)

Analog input resolution 10 bits

Conversion time (analog input) 1 ms per channel + controller cycle time

Processing time (1K binary operations) 0.2 ms

RAM memory 256 KB (application) + 256 KB (internal variables)

Flash memory 256 KB

SD card support Yes, up to 2 GB

Max. Number of TM3 expansion modules: 7 (local architecture) / 14 (remote)

Communication interfaces: 1 x USB (mini-B), 2 x RS-485 (RJ45)

Communication protocols: Modbus RTU/ASCII (master/slave), SoMachine-Network

Built-in functions: PWM, PLS, frequency generator, counter (A/B, single-phase, pulse/direction)

Output protection: Overload and short-circuit protection (1 A, automatic reset)

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