Schneider TM258LD42DT Compact Logic Controller

Schneider TM258LD42DT Compact Logic Controller

Product Introduction

The TM258LD42DT belongs to the Schneider Electric Modicon M258 series. This compact logic controller combines powerful processing, all-transistor outputs, and multiple communication ports in one unit. Specifically, it targets machine builders who need fast switching and flexible expansion. The controller runs on 24 VDC and fits DIN rail mounting inside standard cabinets. Meanwhile, its dual-core ARM Cortex-A8 processor separates program tasks from communication tasks. As a result, scan performance stays stable even under heavy network traffic. The TM258LD42DT supports up to seven TM5 or TM2 expansion modules, reaching a maximum of 2400 I/O points.

Technical Specifications

The processor uses a dual-core ARM Cortex-A8 architecture. Core1 handles program tasks, while Core2 manages communication tasks. Although clock speed is not published, scan speed reaches 0.022 µs per Boolean instruction. This equals more than 45,000 Boolean instructions per millisecond. Program memory holds 128 K instructions. Data memory includes 64 MB RAM internally and 128 MB Flash for storage.

For I/O capacity, the unit provides 26 digital inputs. Among them, 18 are regular 24 VDC inputs and 8 are fast HSC inputs rated at 100 kHz. Additionally, it offers 16 transistor outputs with source or PNP wiring. Each point delivers 0.5 A, and 4 of them are fast outputs. Furthermore, the controller supports 8 high-speed counters at 100 kHz and 4 fast reflex pulse outputs. Analog inputs and outputs are not available on this model. However, expansion modules can add analog and special functions later.

Communication is a strong point of this controller. Built-in ports include one Ethernet RJ45, one CANopen SUB-D9, one RS-485 serial link, and one USB-B mini programming port. Protocols cover Modbus TCP, CANopen master, and Modbus RTU or ASCII. In addition, two free PCI slots accept optional communication or function modules. Therefore, users can add fieldbus cards without replacing the base unit.

Mechanical and Environmental Parameters

The housing measures 99 × 265 × 75 mm in height, width, and depth. It carries an IP20 protection rating, so it must sit inside a clean enclosure. The supply voltage is 24 VDC, with a range of 19.2 to 28.8 V. Power consumption equals 13.03 W. Because the unit is self-powered, no backplane bus current applies. The net weight is approximately 0.5 kg.

Operating temperature ranges from 0 to +55 °C. With derating, it can reach +60 °C. Storage temperature spans -25 to +70 °C. Relative humidity sits between 10 and 95 percent, non-condensing. These ratings suit most industrial floors, but avoid condensation and direct moisture.

Installation Guide

First, mount the controller on a standard DIN rail inside a control cabinet. Keep at least 50 mm of free space above and below for airflow. Next, connect the 24 VDC supply to the dedicated power terminals. Verify polarity before switching on the power. After that, wire digital inputs and transistor outputs according to the terminal diagram. Use shielded cable for high-speed counter signals to reduce noise.

For communication, plug the Ethernet cable into the RJ45 port. Then connect CANopen or serial devices to their respective ports. Meanwhile, install SoMachine or EcoStruxure Machine Expert on your PC. Use the USB-B mini port for first-time programming. Finally, configure expansion modules in the software before running the machine. If you add PCI communication cards, power down the unit first.

Packaging List

• 1 × Schneider TM258LD42DT Compact Logic Controller

• 1 × Terminal block set

• 1 × Mounting clip pack

• 1 × Quick start guide

• 1 × Original carton box

Shipping methods: Fedex, UPS, DHL.

FAQ

Q1: What is the main difference between the TM258LD42DT and relay output models?
A: This model uses all transistor outputs rated at 0.5 A per point. Transistor outputs switch faster and suit high-cycle DC loads.

Q2: Can the TM258LD42DT handle analog signals?
A: No, the base unit has no analog inputs or outputs. However, you can add TM5 or TM2 expansion modules for analog functions.

Q3: Which programming software supports this controller?
A: You can use SoMachine or EcoStruxure Machine Expert. Both tools support configuration, programming, and diagnostics.

Q4: How many expansion modules can I connect?
A: The controller accepts up to 7 TM5 or TM2 expansion modules. This can reach a maximum of 2400 I/O points.

Q5: What communication protocols does the TM258LD42DT support?
A: It supports Modbus TCP, CANopen master, Modbus RTU, and Modbus ASCII. Two PCI slots allow extra communication modules.