Product Overview
Machine builders lose money when a single controller cannot handle fast counting, logic, and networking at once. The TM258LD42DR from Schneider Electric solves that problem. It is a compact logic controller in the Modicon M258 series. This unit packs 42 I/O, a dual-core processor, and embedded Ethernet into one 265 mm wide housing. For system integrators, that means fewer components, simpler panels, and lower total cost of ownership.
Cost-Efficiency by Design
Every specification on this controller maps to a cost or efficiency gain.
Processing Power That Reduces Cycle Time
The dual-core ARM Cortex-A8 processor splits work: Core1 handles program tasks, while Core2 manages communication tasks. This separation keeps logic execution fast even during heavy network traffic. The scan speed of 0.022 µs per Boolean instruction delivers over 45,000 Boolean instructions per millisecond. Faster scan times mean higher machine throughput and less wasted production time.
Memory for Complex Programs
With 128 K instructions of program memory and 64 MB RAM plus 128 MB Flash for data, this controller handles substantial applications without an immediate upgrade. You avoid the cost of a larger PLC and the engineering hours that migration would require.
I/O That Eliminates Extra Hardware
The 42 built-in I/O points include 26 digital inputs and 16 digital outputs. Among the inputs, 18 are regular 24 Vdc and 8 are fast HSC channels rated at 100 kHz. The outputs split into 4 fast transistor outputs at 0.1 A and 12 relay outputs at 2 A. Because high-speed counting is built in, you do not need separate counter modules. That saves panel space, wiring, and component cost.
Communication Without Add-On Cards
Built-in ports include Ethernet RJ45, CANopen (SUB-D9), RS-485 serial, and USB-B mini for programming. Supported protocols cover Modbus TCP, CANopen master, Modbus RTU/ASCII, and a proprietary programming protocol over USB. Embedded Ethernet removes the need for a separate communication module in many architectures, directly reducing hardware spend.
Technical Specifications
| Specification | Value |
|---|---|
| Series | Modicon M258 |
| Processor | Dual-core ARM Cortex-A8 |
| Program memory | 128 K instructions |
| Data memory | 64 MB RAM; 128 MB Flash |
| Digital inputs | 26 (18 regular 24 Vdc + 8 fast HSC 100 kHz) |
| Digital outputs | 16 (4 fast transistor 0.1 A + 12 relay 2 A) |
| High-speed counters | 8 × 100 kHz |
| Supply voltage | 24 V DC (19.2…28.8 V) |
| Power consumption | 17.22 W |
| Operating temperature | 0…+55 °C (0…+60 °C with derating) |
| Protection rating | IP20 |
| Dimensions (H×W×D) | 99 × 265 × 75 mm |
| Weight | 0.5 kg |
Where This Controller Pays Off
Packaging and Labeling Lines
High-speed counting at 100 kHz suits registration mark detection and product counting. The 4 fast reflex outputs respond quickly to sensor events. Together they reduce scrap and improve line speed, which lowers cost per unit.
Material Handling and Sorting
CANopen master capability connects drives and remote I/O over one cable. Fewer cables mean lower installation labor and easier troubleshooting. The 12 relay outputs at 2 A can switch valves and contactors directly, avoiding interposing relays.
Building Automation and Pump Control
Modbus TCP over Ethernet links the controller to SCADA and building management systems. Modbus RTU/ASCII over RS-485 supports legacy devices. This mix protects existing investments while enabling modern data collection.
Installation and Setup
Mount the controller on a standard DIN rail inside an enclosure rated for IP20 environments. Keep the 24 V DC supply within the 19.2…28.8 V range to protect internal circuits. Use the USB-B mini port for initial programming with SoMachine or EcoStruxure Machine Expert software. Route Ethernet, CANopen, and RS-485 cables away from high-voltage wiring to reduce noise. Allow airflow around the 99 × 265 × 75 mm housing, especially when operating near the upper temperature limit.
Expansion and Integration
The controller accepts up to 7 TM5 or TM2 expansion modules, reaching a maximum of 2400 I/O. Two free PCI slots accept optional communication or function modules. This scalability lets you start small and add capacity as production grows, spreading capital cost over time.
Maintenance and Reliability
Inspect the unit periodically for dust buildup and secure connections. Verify that enclosure temperature stays within the operating range. Relay outputs are mechanical and will wear over time, so plan replacement intervals based on switching frequency. The IP20 rating requires a clean, dry control cabinet. Following these practices extends service life and protects your automation investment.
Selection Checklist
Before ordering, confirm your I/O count, protocol needs, and panel dimensions. Check that your power supply delivers a stable 24 V DC. Verify that your programming software version supports the Modicon M258 platform. SpareTechPLC supplies genuine Schneider automation parts and can help confirm compatibility with your existing system.
Frequently Asked Questions
Does the TM258LD42DR include analog I/O?
No. This model provides digital inputs and outputs only. You can add analog capability through TM5 or TM2 expansion modules.
Which software programs this controller?
Use SoMachine or EcoStruxure Machine Expert from Schneider Electric.
How many expansion modules can I connect?
You can connect up to 7 TM5 or TM2 expansion modules, reaching a maximum of 2400 I/O.
What communication protocols are built in?
The controller supports Modbus TCP, CANopen master, Modbus RTU/ASCII, and a proprietary programming protocol over USB.
Is this controller still in production?
Yes. The lifecycle status is active, last verified in September 2026.
