Schneider TM258LF42DT Logic Controller: Compact 42-I/O Modicon M258

Product Overview

When downtime strikes your production line, the Schneider TM258LF42DT logic controller provides a dependable solution. Part of the Modicon M258 family, this compact base unit integrates 42 discrete I/O points, including 12 standard outputs, 4 fast outputs, 10 fast inputs, 12 regular inputs, and 4 additional regular inputs. Designed for 24 V DC operation, it ensures stable performance in demanding industrial environments.

Technical Specifications Breakdown

The TM258LF42DT delivers precise control with key specifications that matter for maintenance engineers. Its discrete input logic supports both sink and source configurations, with a guaranteed voltage state 1 at >= 15 V for fast and regular inputs, and state 0 at <= 5 V. Input impedance is 6 kOhm for fast and regular inputs, drawing 4 mA each. Configurable filtering times range from 0 ms to 12 ms, with anti-bounce filtering adjustable from 2 µs to 4 ms. Outputs are source logic, rated at 24 V DC with a voltage range of 19.2...28.8 V. The main supply accepts 20.4...28.8 V DC, consuming up to 13.03 W. Execution time per Boolean instruction is just 22 ns, backed by 128 MB Flash and 64 MB internal RAM.

Industry Applications

In packaging machinery, the TM258LF42DT handles high-speed counting with 8 counting inputs at 200 kHz, ensuring precise product tracking. For material handling systems, its CANopen master interface (via male SUB-D 9) enables seamless coordination with drives and sensors over bus lengths up to 5000 m at 10 kbit/s. The integrated Ethernet Modbus TCP/IP slave port (10BASE-T/100BASE-TX) simplifies connection to plant-wide SCADA systems, reducing integration time.

Installation & Setup Guidance

Mount the TM258LF42DT on a symmetrical DIN rail using its integrated support. Ensure the ambient temperature stays within 0...55 °C for horizontal installation without derating, or up to 60 °C with derating. For vertical mounting, limit to 50 °C. Maintain cable distances of 30 m for fast inputs, fast outputs, and regular inputs to preserve signal integrity. Use the isolated serial links (RJ45 for Modbus, mini B USB, and USB type A) for programming and diagnostics. The real-time clock offers drift <= 6 s/month with user calibration, backed by a CR2477M Renata battery for 1.5 years of data retention.

Maintenance & Reliability

From a maintenance engineer's perspective, the TM258LF42DT minimizes unplanned downtime through robust design. Its IP20 enclosure (per IEC 61131-2) protects against solid objects, while pollution degree 2 compliance ensures reliable operation in typical industrial settings. The unit withstands vibration up to 1 gn at 8.4...150 Hz on DIN rail and shock resistance of 15 gn for 11 ms. Regular inspection of the battery LED (red for BATT) and module status LED (green/red for RUN/MS) helps preempt issues. With an operating altitude up to 2000 m and storage from -25...70 °C, this controller suits diverse environments.

Compatibility & Integration

The TM258LF42DT integrates with multiple networks via its built-in ports: one CANopen master (SUB-D 9), one isolated serial link (RJ45) for Modbus RTU/ASCII at 300...115200 bps, and one isolated Ethernet port for Modbus TCP/IP. It also includes a mini B USB and an USB type A port for programming and data transfer. This flexibility allows seamless connection to Schneider Electric drives, sensors, and third-party devices, simplifying system upgrades.

Selection Guide & Purchasing Advice

Before ordering, verify your system voltage matches the 24 V DC supply (20.4...28.8 V limits) and confirm I/O count requirements (42 total). The TM258LF42DT is CE marked and carries CSA, C-Tick, cULus, and GOST-R certifications. For current lifecycle status and availability, contact AutoDCSTech, your trusted source for industrial automation parts. We stock this model and can advise on replacement options if needed.