Schneider TM221CE16T M221 PLC 16 I/O Transistor

TM221CE16T Modicon M221 Logic Controller

Product Introduction

The TM221CE16T belongs to the Modicon M221 range and delivers precise control through its transistor-based output stage. This controller operates on a 24 V DC supply and includes 9 discrete inputs (4 of which are fast), 2 analog inputs, and 7 transistor outputs (including 2 fast outputs). Its compact design, combined with advanced positioning and counting functions, makes it an excellent choice for motion control, conveyor systems, and packaging machinery. Furthermore, the integrated Ethernet port supports Modbus TCP and Ethernet/IP protocols, ensuring smooth communication with higher-level systems.

Technical Specifications

Power Supply and Electrical Characteristics

The TM221CE16T requires a rated supply voltage of 24 V DC, with operational limits from 20.4 to 28.8 V DC. Its inrush current reaches a maximum of 35 A. Power consumption is rated at 11 W with a full complement of expansion modules and drops to just 4.6 W without them. Additionally, the controller supplies a 24 V DC sensor power output at 150 mA for the expansion bus, plus a 5 V output at 325 mA. These built-in power capabilities simplify system wiring by reducing the need for external power supplies.

Input Configuration

This logic controller provides 9 discrete inputs that comply with IEC 61131-2 Type 1 standards. Among these, four terminals (I0, I1, I6, I7) function as fast inputs with response times as low as 5 µs. The inputs accept 24 V DC signals and support both sink and source logic configurations. Furthermore, the TM221CE16T includes 2 analog inputs with a 0–10 V range and 10-bit resolution. Their conversion time is 1 ms per channel plus one controller cycle, while the absolute accuracy error stays within ±1% of full scale.

Transistor Output Stage

The TM221CE16T features 7 transistor outputs arranged in PNP (positive logic) configuration. Two of these outputs (Q0 and Q1) are fast outputs capable of 100 kHz operation in PWM or PLS modes. Outputs Q2 and Q3 support 5 kHz, while Q4 through Q6 operate at 0.1 kHz. Each output handles 0.5 A at 24 V DC, with a voltage drop of less than 1 V. Importantly, these outputs include overload and short-circuit protection at 1 A, with an automatic reset after 1 second. This protection feature enhances system reliability and reduces downtime.

Positioning and Motion Control

A key strength of the TM221CE16T lies in its integrated positioning functions. It supports two axes of PTO (Pulse Train Output) in pulse/direction mode at 100 kHz, as well as one axis in CW/CCW mode at the same frequency. Additionally, the controller offers PWM (Pulse Width Modulation), PLS (Pulse), and frequency generator functions. These capabilities make the Modicon M221 controller particularly suitable for simple servo drive control, stepper motor positioning, and variable speed applications without requiring dedicated motion modules.

High-Speed Counting

Four fast inputs on the TM221CE16T operate in high-speed counter (HSC) mode at frequencies up to 100 kHz. They support single-phase, A/B, and pulse/direction control signal types, with a counting capacity of 32 bits. Whether you need to monitor encoder feedback, count high-speed product flow, or measure rotational speed, these counters deliver the performance required. Their rapid response ensures accurate data capture even in demanding production environments.

Communication and Networking

Built-in Ethernet connectivity distinguishes the TM221CE16T from simpler controllers. The RJ45 port supports 10BASE-T/100BASE-TX and provides Modbus TCP client/server, Modbus TCP slave, and Ethernet/IP adapter services. For programming and diagnostics, a mini B USB 2.0 port offers a direct connection to SoMachine Basic software. Moreover, a non-isolated serial link with RS232/RS485 interfaces supports Modbus RTU/ASCII protocols, enabling communication with legacy devices. This combination of ports ensures the TM221CE16T integrates easily into both new and existing architectures.

Memory and Real-Time Capabilities

The controller houses 256 kB of RAM for user applications and data, plus another 256 kB for internal variables. An additional 256 kB of built-in flash memory backs up your application and key data. The real-time clock maintains accurate time with a monthly drift of ≤30 seconds at 25 °C, and the BR2032 lithium battery preserves settings during power outages for up to one year. Execution of 1,000 instructions takes only 0.3 ms, while Boolean instructions execute in 0.2 µs, ensuring responsive control even in complex logic sequences.

Expansion and Scalability

The TM221CE16T supports up to four I/O expansion modules, whether transistor or relay output types. This scalability allows you to tailor the system to your specific application needs without changing the main controller. The expansion bus draws power directly from the controller, simplifying installation. With object areas supporting up to 512 memory bits, 8,000 memory words, 255 timers, and 255 counters, the controller provides ample resources for medium-scale automation projects.

Mechanical and Environmental Specifications

Mounting Dimensions

The Modicon M221 controller measures 90 mm in height, 70 mm in depth, and 95 mm in width. It mounts on a top hat TH35-7.5/15 rail per IEC 60715, or on a panel using the optional fixing kit. Its lightweight design (0.346 kg) and compact footprint save valuable cabinet space, particularly when multiple expansion modules are installed side by side. The removable screw terminal blocks for inputs and outputs simplify wiring and maintenance tasks.

Operating Conditions

For horizontal installation, the ambient temperature range spans -10 to 55 °C, while vertical mounting supports -10 to 35 °C. Storage temperatures may range from -25 to 70 °C. Relative humidity between 10 and 95% (non-condensing) is acceptable in both operation and storage. With the protective cover fitted, the TM221CE16T achieves an IP20 protection rating, guarding against solid objects larger than 12.5 mm. These specifications make it suitable for most industrial environments, including those with moderate dust and moisture.

Mechanical Robustness

Vibration resistance is rated at 3.5 mm from 5 to 8.4 Hz and 1 gn from 8.4 to 150 Hz on both rail and panel mounting. Shock resistance reaches 147 m/s² with an 11 ms test wave duration. Such robust mechanical properties ensure the TM221CE16T maintains reliable operation in applications subject to continuous machinery vibration or occasional impacts. Equipment like presses, conveyors, and packaging lines benefit from this durability.

Electromagnetic Compatibility

The controller exhibits strong immunity to electromagnetic disturbances. It withstands electrostatic discharge of 4 kV contact and 8 kV air, radiated fields up to 10 V/m, and fast transients of 2 kV on power lines. Surge immunity includes 2 kV common mode on AC power lines and 0.5 kV differential mode on DC lines. Conducted and radiated emissions meet EN/IEC 55011 Class A limits, ensuring the Modicon M221 does not interfere with nearby sensitive electronics. Additionally, marine certifications (LR, ABS, DNV, GL) confirm its suitability for shipboard applications.

Insulation and Safety

Insulation ratings for the TM221CE16T include 500 V AC between fast inputs and internal logic, 500 V AC between outputs and internal logic, and 500 V AC between inputs and internal logic. Analogue inputs are non-insulated from each other and from internal logic. The controller complies with EN/IEC 61010-2-201 and EN/IEC 61131-2 standards, carrying certifications from RCM, CSA, cULus, IACS E10, ABS, LR, DNV-GL, and EAC. These approvals streamline global deployment and regulatory acceptance.

Installation Guidelines

Proper installation of the TM221CE16T ensures optimal performance and longevity. Begin by mounting the controller securely on a DIN rail or panel, ensuring adequate clearance for ventilation and cable access. Connect the 24 V DC power supply to the 3-terminal block, observing correct polarity. The removable terminal blocks for I/O simplify wiring: use shielded cables for fast inputs (up to 10 meters) and fast outputs (up to 3 meters) to minimize electrical noise. Unshielded cables work well for standard digital inputs and outputs up to 30 meters. For analog inputs, keep unshielded cable length to 1 meter or use shielded cable for longer runs. Finally, connect the Ethernet cable to the RJ45 port and, if needed, the USB cable for programming. Always terminate unused wires properly and secure all connections to avoid intermittent faults.

Packaging List

• 1 x TM221CE16T Modicon M221 logic controller

• 1 x Removable screw terminal block for inputs

• 1 x Removable screw terminal block for outputs

• 1 x Mini B USB 2.0 programming cable (length varies)

• 1 x Mounting clip for DIN rail

• 1 x Quick start guide (multi-language)

• 1 x Product label with serial number

Shipping: FedEx, UPS, DHL

Frequently Asked Questions

1. What software do I need to program the TM221CE16T?
The TM221CE16T is programmed using Schneider Electric's SoMachine Basic software. This free tool supports ladder logic, instruction list, and structured text, making it accessible for both beginners and experienced programmers.

2. Can the TM221CE16T control a stepper or servo motor directly?
Yes. The TM221CE16T includes two fast outputs (Q0, Q1) that support PTO in pulse/direction or CW/CCW mode at 100 kHz. This allows direct connection to many stepper drives and servo amplifiers without additional motion modules.

3. What is the difference between the TM221CE16T and the TM221CE16R?
The TM221CE16T uses transistor outputs (PNP) and requires 24 V DC power, while the TM221CE16R uses relay outputs and operates on 100–240 V AC. The TM221CE16T offers faster switching and positioning functions, making it better suited for motion control.

4. Does the TM221CE16T support Ethernet/IP communication?
Absolutely. The built-in Ethernet port supports Ethernet/IP adapter functionality, enabling the Modicon M221 to communicate with Rockwell Automation and other Ethernet/IP-compatible devices seamlessly.

5. What protection does the TM221CE16T have on its outputs?
Each transistor output on the TM221CE16T includes overload and short-circuit protection at 1 A. The protection resets automatically after 1 second, reducing system downtime and protecting connected loads from damage.