Modicon M221 TM221CE40R Logic Controller Schneider Electric

TM221CE40R – Compact PLC with Relay Outputs and Ethernet

Product Introduction

The TM221CE40R belongs to the Modicon M221 series from Schneider Electric. This logic controller delivers a balanced mix of digital and analog I/O, relay outputs, and Ethernet connectivity. It serves small machines, conveyor systems, packaging lines, and HVAC applications. The controller supports up to 7 expansion modules, so you can scale I/O as needed. Its built-in Modbus TCP and serial communication simplify integration with HMIs, drives, and SCADA systems. Moreover, the TM221CE40R includes four fast inputs for high-speed counting up to 100 kHz. This feature makes it suitable for positioning or flow measurement tasks. Overall, the unit offers reliable performance in a compact footprint.

Technical Specifications

Power Supply and Inputs

The controller operates on a 100...240 V AC supply with limits from 85 to 264 V. It consumes up to 70 VA and handles inrush currents up to 40 A. For discrete inputs, the unit provides 24 points conforming to IEC 61131-2 Type 1. These inputs support sink or source wiring and operate at 24 V DC. Among them, 4 inputs are fast, with response times as low as 5 µs. Additionally, the TM221CE40R includes 2 analog inputs with a 0...10 V range and 10-bit resolution. The conversion time is 1 ms per channel plus one cycle time. Accuracy stays within ±1% of full scale, which ensures reliable measurements.

Output Characteristics

For outputs, this model offers 16 relay channels, normally open type. These relays handle voltages from 5...250 V AC and 5...125 V DC. Each output supports up to 2 A current, with a maximum of 8 A per common group. The relays are rated for various load types, including resistive and inductive. For example, resistive loads at 240 V/160 VA achieve 300,000 cycles. Inductive AC-15 loads at 240 V/36 VA also reach 300,000 cycles. Mechanical durability exceeds 20 million operations, so the relays last long in frequent switching applications.

Communication and Connectivity

The TM221CE40R includes three communication ports. First, an Ethernet RJ45 port supports 10BASE-T/100BASE-TX. It acts as a Modbus TCP server and client, plus DHCP client. Second, a non-isolated serial link (RS232/RS485) supports Modbus RTU/ASCII. Third, a USB mini B port enables fast programming at 480 Mbit/s. These options give you flexibility for connecting to programming terminals, operator panels, and field devices. Furthermore, the controller offers a 2 GB SD card slot for data logging and program backup.

Memory and Performance

The built-in memory provides 256 kB for programs, storing up to 10,000 instructions. Execution speed reaches 0.3 ms per 1,000 instructions for periodic tasks. Boolean instructions execute in 0.2 µs. The controller also includes a real-time clock with a drift of ≤30 s/month at 25 °C. For control applications, it supports up to 14 simultaneous PID loops. These loops help maintain precise regulation in temperature, pressure, or flow processes.

Mechanical and Environmental Specifications

Dimensions and Mounting

The TM221CE40R measures 160 mm wide, 70 mm high, and 70 mm deep. It weighs only 0.456 kg. You can mount it on a DIN rail (TH35-7.5 or TH35-15) or on a plate using a fixing kit. The compact size saves panel space, making it ideal for crowded cabinets.

Environmental Ratings

Operating temperature ranges from -10...55 °C for horizontal installation, and -10...35 °C for vertical mounting. Storage temperature spans -25...70 °C. Humidity tolerance is 10...95% without condensation. The unit has an IP20 protection rating when the cover is in place. For vibration, it withstands 3.5 mm (5...8.4 Hz) and 3 gn (8.4...150 Hz). Shock resistance is 10 gn for 11 ms. These specs ensure stable operation in industrial environments.

Electrical Immunity

The controller meets EN/IEC 61131-2 and EN/IEC 61010-2-201 standards. It resists electrostatic discharge up to 8 kV in air and 4 kV on contact. Fast transients up to 2 kV on power lines and relay outputs are tolerated. Surge withstand levels reach 2 kV common mode on AC power lines. Additionally, radiated and conducted emissions comply with EN/IEC 55011 Class A limits. These certifications confirm reliable operation even near heavy machinery or variable frequency drives.

Installation and Wiring Guide

Mounting Instructions

First, choose a flat, clean surface inside your control panel. For DIN rail mounting, clip the controller onto the rail until it clicks. Ensure the rail meets IEC 60715 standards. For panel mounting, use the optional fixing kit. Leave at least 50 mm of clearance above and below for ventilation. Avoid placing the unit near high-voltage or high-heat sources.

Wiring Recommendations

Use shielded cables for fast inputs and keep cable lengths under 10 m for those signals. For standard inputs and outputs, unshielded cables up to 30 m are acceptable. The screw terminal blocks are removable, so you can pre-wire them before insertion. Connect the 24 V DC sensor supply (250 mA max) carefully. Also, ensure the main power supply is within 85...264 V AC. For relay outputs, consider snubber circuits if switching inductive loads. This practice extends relay life and reduces electrical noise.

Grounding and Shielding

Proper grounding is essential. Connect the protective earth terminal to the panel ground. Use a low-impedance path to reduce noise susceptibility. For analog inputs, maintain separation from power wiring. This prevents interference and maintains accuracy. Additionally, tie shield drains at the controller end only, not at both ends, to avoid ground loops.

Packaging List

When you receive the TM221CE40R, the package includes the following items:

• 1 x TM221CE40R logic controller unit

• 1 x removable screw terminal block for inputs

• 1 x removable screw terminal block for outputs

• 1 x 3‑terminal block for 24 V DC power connection

• 1 x 4‑terminal block for analog inputs

• 1 x protective cover (pre-installed)

• 1 x quick start guide (printed)

Note: The SD card, programming cable, and mounting accessories are sold separately. For shipping, we use FedEx, UPS, or DHL depending on your region.

Frequently Asked Questions (FAQ)

1. Can I expand the I/O beyond the built-in 40 points?
Yes. The TM221CE40R supports up to 7 expansion modules. These can add up to 48 additional discrete outputs, especially useful for relay or digital expansion.

2. What software do I need to program this controller?
You can use EcoStruxure Machine Expert – Basic (formerly SoMachine Basic). This software is free and supports the full M221 series. It offers ladder, FBD, and IL programming.

3. How do I connect this PLC to a SCADA system?
Use the built-in Ethernet port with Modbus TCP protocol. The PLC works as a server or client. Alternatively, use the serial port with Modbus RTU for legacy systems.

4. What is the maximum counting frequency on fast inputs?
In single-phase or pulse/direction modes, the fast inputs support up to 100 kHz. In A/B quadrature mode, the limit is 50 kHz. This suits encoder and high-speed sensor applications.

5. Does the relay output support DC inductive loads?
Yes. For DC‑13 loads at 24 V/7.2 W, the relay lasts 300,000 cycles. At 24 V/24 W, it lasts 100,000 cycles. Always check the load rating and consider external protection for longevity.