Modicon M221-24I/O TM221C24 Programmable Controller - T2UK Variant

The Modicon M221-24I/O TM221C24 is a compact, all-in-one programmable logic controller from Schneider Electric's M221 series. Designed for small to medium-sized machines, this controller offers 24 integrated I/O points (digital inputs and transistor outputs) with PNP configuration. The T2UK variant is tailored for the UK market with specific voltage and certification requirements. It features embedded Ethernet for easy connectivity and programming.

CPU and Performance

Powered by a 32-bit Cortex-M3 processor at 72 MHz, the TM221C24 delivers fast execution of logic and arithmetic operations. User program memory is 256 KB, with 128 KB of data memory. The cycle time is typically 0.3 ms for 1K instructions. It supports up to 128 function blocks and 32 tasks.

Integrated I/O Configuration

The base unit includes 14 digital inputs (24 VDC, PNP, 4 of which can be high-speed counters up to 60 kHz) and 10 transistor outputs (PNP, 0.5 A, 24 VDC, with 2 outputs configurable as PWM). No analog inputs are built-in, but expansion via optional modules (up to 7) provides analog, temperature, and additional digital I/O.

Communication Ports

The controller has one Ethernet port (10/100 Mbps) supporting Modbus TCP, EtherNet/IP, and web server functions. It also includes one RS-232/RS-485 serial port (programmable for Modbus RTU or ASCII) and a USB mini-B port for programming and data exchange.

Programming Software

Programming is performed using EcoStruxure Machine Expert - Basic or SoMachine Basic, which supports ladder diagram and instruction list. The software includes built-in simulation, online monitoring, and a library of predefined function blocks for PID, counters, timers, and communication.

Motion and Special Functions

The TM221C24 supports two-axis motion control via pulse train outputs (PTO) or PWM for simple positioning applications. It also includes onboard PWM outputs for dimming or speed control. High-speed counters can be used for encoder feedback.

Environmental and Electrical Data

Operating temperature: -10°C to +55°C, storage: -40°C to +70°C. Power supply: 24 VDC (20.4-28.8 V), consumption approx. 100 mA (plus external load). Enclosure rating: IP20 (needs cabinet).

Installation and Wiring

Mounting is via DIN-rail or panel with screw clips. Removable spring-clamp terminals simplify wiring. All I/O terminals are clearly labeled. The Ethernet port supports auto-MDI/MDIX.

Applications

Ideal for packaging machines, conveyors, textile machinery, and small handling systems. Its compact size and built-in Ethernet make it suitable for IIoT-enabled devices.

Diagnostics and Security

Status LEDs for power, run/stop, and I/O. The controller includes a real-time clock with battery backup for data logging. Security features include user password protection and access control.

Compliance

CE, UL, and CCC certified. Complies with EN 61131-2, IEC 61000-6-2/4.

In summary, the Modicon M221-24I/O TM221C24/T2UK PLC provides a cost-effective, feature-rich solution for small automation projects, combining logic, motion, and networking in a compact package.