Schneider Electric TM258LF42DT

Overview of the Modicon M258 Logic Controller (TM258LF42DT)

Introduction

The Modicon M258 Logic Controller, model TM258LF42DT, represents a compact and robust solution for managing a variety of automation tasks. Engineered for seamless integration, this controller is part of Schneider Electric's Modicon series, renowned for reliability and performance in industrial environments.

Technical Specifications

Input/Output Configuration

The controller boasts 42 discrete I/Os, with a nuanced composition of inputs and outputs to suit rapid processing needs: 10 are fast inputs, 12 are standard inputs, and the remaining 20 include 12 outputs and 4 fast outputs. Input logic varies—fast inputs and regular inputs are sink-type, whereas standard inputs are source-type. Inputs accept a 24 V DC signal with voltage states guaranteed above 15 V (active) or below 5 V (inactive). Input impedance stands at 6 kOhm for both fast and regular inputs, ensuring stability and noise immunity.

Output Characteristics

Output logic operates as a source, with discrete output voltage at 24 V DC, and is capable of withstanding voltage limits from 19.2 to 28.8 V. Fast outputs can manage a discrete output current of 4 mA, tailored for quick responses in automation tasks.

Power Supply and Consumption

The unit requires a 24 V DC supply with operational limits between 20.4 to 28.8 V, catering to a range of power supply scenarios. The controller's power consumption is modest at 13.03 W, with distinct rated currents specified for various power segments and the provision for peak current handling for transient conditions.

Memory and Processing

With 128 MB of flash memory and 64 MB of internal RAM, the TM258LF42DT is well-equipped for complex logic and data-intensive applications. The lack of a real-time clock or the presence of a user-calibration option ensures the system maintains accurate timekeeping critical for time-stamped events and operations.

Connectivity

The controller's connectivity is versatile, with an array of isolated serial links including Modbus RTU/ASCII, Modbus TCP/IP, USB, and CANopen interfaces. These options provide flexibility in communication with other devices and networks, adhering to various baud rates and transmission speeds.

Signal Indication and Interface

Local signaling is robust, with dedicated LEDs indicating the status of I/O channels, communication, network status, and system health. This feature is invaluable for at-a-glance diagnostics and monitoring.

Mounting and Dimensions

The device is designed for symmetrical DIN rail mounting, with dimensions conducive to compact industrial spaces—175 mm in width, 99 mm in height, and 85 mm in depth, and it weighs a modest 0.55 kg.

Environmental Compatibility and Certification

Operational Durability

The controller is designed to withstand an ambient operational temperature range of 0 to 55 °C without derating and possesses certifications like UL 508 and IEC 61131-2, indicative of its ruggedness. It is also compliant with various standards for shock, vibration, and electromagnetic resistance, ensuring reliable performance in harsh industrial settings.

Compliance and Sustainability

In adherence to environmental regulations, the TM258LF42DT complies with REACh, EU RoHS, and China RoHS, confirming the absence of toxic heavy metals and other hazardous substances. Its PVC-free construction and adherence to WEEE directives underscore Schneider Electric's commitment to sustainability and environmental responsibility.

Conclusion

The TM258LF42DT from Schneider Electric’s Modicon M258 series is a versatile and efficient logic controller that is well-suited for a range of industrial applications. It brings together robust I/O capabilities, reliable power handling, ample memory resources, diverse connectivity options, and adherence to environmental and operational standards, making it a solid choice for automation systems requiring compact and resilient control solutions.

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