TM258LF42DT Modicon M258 Controller: 42 I/O CANopen PLC

Compact Power for Modern Automation

Industrial control systems are evolving rapidly, and the demand for compact yet powerful logic controllers continues to grow. The Schneider Electric TM258LF42DT from the Modicon M258 range addresses this need with a 42 I/O configuration that fits neatly into space-constrained panels. This controller is designed for applications that require precise control, fast response, and robust communication, making it a practical choice for machine builders and system integrators.

With a 24 V DC supply and integrated CANopen master capability, the TM258LF42DT simplifies network architecture while maintaining high performance. Its compact form factor—measuring 175 mm wide, 99 mm high, and 85 mm deep—allows for efficient use of cabinet space, and the 0.55 kg weight eases installation. Whether you are upgrading an existing line or building a new machine, this controller offers a balanced mix of I/O, speed, and connectivity.

Technical Specifications and Performance

The TM258LF42DT delivers a solid set of specifications that support demanding control tasks. It features 12 discrete inputs for regular use, 4 fast inputs, and 4 regular inputs, along with 12 discrete outputs and 4 fast outputs. This mix enables high-speed counting and precise output timing, which is essential for applications like packaging or material handling.

Input voltage is rated at 24 V DC, with a guaranteed high state at ≥15 V and low state at ≤5 V for all input types. The input current is 4 mA, and input impedance is 6 kOhm, ensuring stable signal detection. For outputs, the controller provides source-type logic with a 24 V DC output voltage, operating within a range of 19.2...28.8 V. The rated supply voltage is 24 V DC, with limits of 20.4...28.8 V, and power consumption is kept low at ≤13.03 W.

Execution time for Boolean instructions is just 22 ns, enabling fast logic processing. The controller includes 128 MB Flash memory and 64 MB internal RAM, providing ample space for programs and data. A real-time clock with user calibration maintains drift within ≤6 s/month, or <30 s/month without calibration at 25 °C, ensuring accurate time-stamping for event logging.

Connectivity and Integration

Communication is a key strength of the TM258LF42DT. It includes a CANopen master interface on a male SUB-D 9 connector, supporting various baud rates from 10 kbit/s up to 1000 kbit/s, with corresponding bus lengths ranging from 5000 m down to 4 m. This flexibility allows integration into different network topologies.

Additionally, the controller offers an isolated serial link on RJ45 for Ethernet Modbus TCP/IP slave (10BASE-T/100BASE-TX), and another isolated serial link for Modbus master/slave RTU/ASCII or character mode (RS232/RS485) at speeds up to 115200 bps. Two USB ports (mini B and type A) at 480 Mbit/s provide convenient programming and data transfer options. These connectivity options make the TM258LF42DT compatible with a wide range of industrial networks.

Application Scenarios

In a typical packaging line, the TM258LF42DT can manage high-speed counting of products using its fast inputs (200 kHz counting capability) and trigger precise output actions via fast outputs. The configurable filtering time (0 ms, 1.5 ms, 4 ms, or 12 ms) helps reject noise, while the anti-bounce filtering (2 µs...4 ms) ensures reliable switch readings.

For material handling systems, the CANopen master interface allows seamless connection to remote I/O blocks, drives, and sensors, reducing wiring and simplifying diagnostics. The controller's ability to handle 8 counting inputs at 200 kHz makes it suitable for encoder feedback or flow metering applications. Its IP20 protection (conforming to IEC 61131-2) is adequate for enclosed control cabinets, and the operating temperature range of 0...55 °C (horizontal, no derating) or up to 60 °C with derating ensures reliable operation in typical industrial environments.

Comparison with Similar Controllers

When compared to other compact PLCs in the market, the TM258LF42DT stands out due to its integrated fast I/O and CANopen master. Many controllers in this class offer only standard I/O, requiring additional modules for high-speed counting or network master functionality. The TM258LF42DT includes these features as standard, reducing overall system cost and complexity.

For instance, while some competitors may offer similar I/O counts, they often lack the 200 kHz counting inputs or the built-in CANopen master. This makes the TM258LF42DT particularly attractive for applications that demand precise motion control or real-time synchronization. Additionally, its dual Ethernet and serial ports provide more flexibility than controllers with only one communication interface.

Business Value and ROI

Investing in the TM258LF42DT can lead to significant cost savings over time. Its compact design reduces panel space and wiring, lowering installation costs. The integrated communication ports eliminate the need for separate gateway devices, further reducing hardware expenses. Moreover, the fast processing speed (22 ns per Boolean instruction) and high-speed I/O can improve machine throughput, directly impacting productivity.

Reliability is another key factor. The controller is certified to CSA C22.2 No 142, IEC 61131-2, UL 508, and CSA C22.2 No 213, and carries CE marking. It withstands vibration (1 gn, 8.4...150 Hz on DIN rail) and shock (15 gn for 11 ms), ensuring long-term operation in harsh conditions. This reduces unplanned downtime and maintenance costs, contributing to a lower total cost of ownership.

Why Choose AutoDCSTech

AutoDCSTech is a trusted supplier of industrial automation parts, offering genuine Schneider Electric products like the TM258LF42DT. We understand the importance of reliable components for your operations, and we ensure that every item we supply meets strict quality standards. With our competitive pricing and efficient logistics, we help you keep your projects on schedule and within budget.

Our team of automation experts is available to assist you with product selection and technical queries. Whether you need a single controller or bulk quantities, we are committed to providing excellent service and fast delivery. Contact AutoDCSTech today to order the TM258LF42DT or to learn more about our full range of automation solutions.

Frequently Asked Questions

What is the power supply requirement for the TM258LF42DT?

The TM258LF42DT requires a 24 V DC supply, with an allowable range of 20.4...28.8 V. The rated current for the main supply is 0.26 A, and the I/O power segment can draw up to 10 A. Ensure your power source can handle these requirements for reliable operation.

Can the TM258LF42DT be used as a CANopen master?

Yes, the TM258LF42DT includes an integrated CANopen master interface on a male SUB-D 9 connector. It supports baud rates from 10 kbit/s to 1000 kbit/s, with corresponding bus lengths up to 5000 m, allowing you to control a network of CANopen slave devices.

What are the fast input capabilities of this controller?

The controller has 4 fast inputs and 10 fast inputs (as per the data) that can handle counting at up to 200 kHz. These inputs are sink-type logic and have a guaranteed high state at ≥15 V and low state at ≤5 V. They are ideal for high-speed counting or frequency measurement.

Does the TM258LF42DT support Ethernet communication?

Yes, it has an isolated serial link on RJ45 for Ethernet Modbus TCP/IP slave, supporting 10BASE-T/100BASE-TX. This allows integration into Ethernet-based control systems for monitoring and data exchange.

What is the operating temperature range?

The TM258LF42DT operates from 0 to 55 °C without derating when installed horizontally, and up to 60 °C with derating. For vertical installation, the range is 0 to 50 °C. Storage temperature is -25 to 70 °C.