Schneider Electric Modicon M221 TM221M16R Logic Controller – 16 I/O Relay, 24 V DC

The TM221M16R from Schneider Electric's Modicon M221 range delivers compact, reliable control for demanding industrial automation tasks. This logic controller combines 8 discrete inputs, 2 analogue inputs, and 8 relay outputs on a single 70 mm wide DIN-rail module. Engineers choose the TM221M16R for its flexible I/O architecture, fast counting inputs, and integrated communication ports. The controller operates on 24 V DC supply and supports up to 7 local expansion modules or 14 remote I/O modules.

Key Technical Specifications

• Brand: Schneider Electric
• Model: TM221M16R
• Product Range: Modicon M221
• Supply Voltage: 24 V DC (limits: 20.4–28.8 V)
• Discrete Inputs: 8 sink/source, IEC 61131-2 Type 1
• Analogue Inputs: 2 channels, 0–10 V, 10-bit resolution, 10 mV LSB
• Discrete Outputs: 8 relay, normally open, 2 A per output
• Output Voltage: 5–125 V DC / 5–250 V AC
• Total I/O: 16 discrete channels
• Fast Counting Inputs: 4 HSC channels at 100 kHz, 32-bit
• Analogue Conversion Time: 1 ms per channel + 1 controller cycle
• Input Response Time: 5 µs turn-on/off (I0, I1, I6, I7); 35 µs other terminals
• Output Response Time: 10 ms turn-on / 10 ms turn-off
• Analogue Accuracy: ±1 % of full scale
• Operating Temperature: -10…55 °C (horizontal); -10…35 °C (vertical)
• Storage Temperature: -25…70 °C
• Relative Humidity: 10…95 % non-condensing
• Ingress Protection: IP20 with cover
• Altitude: 0–2000 m operating / 0–3000 m storage
• Communication: USB mini-B, RS485 (serial 1), RS232/RS485 (serial 2)
• Protocols: Modbus RTU/ASCII master/slave, SoMachine-Network
• Memory: 256 kB application RAM, 256 kB internal variables, 256 kB flash backup
• Real-Time Clock: Yes, drift ≤30 s/month at 25 °C
• PID Loops: Up to 14 simultaneous
• Dimensions: 90 × 70 × 70 mm (H × D × W)
• Weight: 0.264 kg

Installation Guide

• Mount the TM221M16R on a top hat TH35-15 or TH35-7.5 rail per IEC 60715, or use a panel fixing kit.
• Connect 24 V DC supply to the 3-terminal block, observing polarity and inrush current of 35 A.
• Wire discrete inputs to the removable 10-terminal screw block; use shielded cable under 10 m for fast inputs.
• Wire relay outputs to the removable 11-terminal block; keep unshielded output cables under 30 m.
• Connect analogue inputs with unshielded cable under 1 m to preserve signal integrity.
• Use the mini-B USB port for programming, or the RJ45 serial ports for Modbus networks.
• Insert an optional SD card (up to 2 GB) for data storage; use BR2032 or CR2032X battery for backup.
• Verify ambient temperature does not exceed 55 °C horizontal or 35 °C vertical installation.
• Ensure pollution degree ≤2 and altitude ≤2000 m for rated operation.

Environmental & Immunity Performance

• Electrostatic discharge: 8 kV air / 4 kV contact per IEC 61000-4-2.
• Electromagnetic fields: 10 V/m 80 MHz–1 GHz; 3 V/m 1.4–2 GHz; 1 V/m 2–2.7 GHz per IEC 61000-4-3.
• Fast transients: 2 kV power lines and relay output; 1 kV I/O and serial link per IEC 61000-4-4.
• Surge withstand: 2 kV common mode power lines and relay output; 1 kV I/O per IEC 61000-4-5.
• Conducted disturbances: 10 V 0.15–80 MHz per IEC 61000-4-6.
• Magnetic field immunity: 30 A/m at 50/60 Hz per IEC 61000-4-8.
• Vibration resistance: 3.5 mm at 5–8.4 Hz; 1 gn at 8.4–150 Hz on rail or panel.
• Shock resistance: 98 m/s² for 11 ms.
• Microbreak immunity: 10 ms.

Package Contents

• 1 × Schneider Electric TM221M16R logic controller
• 1 × removable screw terminal block, 10 terminals (inputs)
• 1 × removable screw terminal block, 11 terminals (outputs)
• 1 × 3-terminal block for 24 V DC supply
• 1 × 4-terminal connector for analogue inputs
• 1 × mini-B USB programming connector
• Packaging dimensions: 10.04 × 10.83 × 12.81 cm
• Package weight: 440 g
• Shipping via FedEx, UPS, or DHL

Frequently Asked Questions

• What makes the TM221M16R suitable for mixed signal applications? It combines 8 discrete inputs, 2 analogue inputs, and 8 relay outputs on one compact module.
• How many expansion modules can I connect? You can add up to 7 local I/O modules or 14 remote I/O modules.
• Does the controller support high-speed counting? Yes, it provides 4 fast inputs at 100 kHz with 32-bit resolution for HSC mode.
• What communication protocols does the TM221M16R support? It supports Modbus RTU/ASCII master/slave and SoMachine-Network via RS485 and RS232 ports.
• Can I use the controller in marine environments? Yes, it holds DNV-GL, ABS, and LR certifications for marine applications.
• What is the relay output durability? Mechanical durability reaches 20,000,000 cycles; electrical durability varies by load type and voltage.

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