Schneider Electric TM258LF42DR Modicon M258 PLC

The Schneider TM258LF42DR is a compact programmable logic controller from the Modicon M258 series. It combines a high‑performance CPU with a mix of on‑board I/O: 24 digital inputs (24V DC) and 18 relay outputs (2A per channel). The controller includes two CANopen ports, an Ethernet port, and a USB programming port. It supports integrated motion control for up to 4 axes (pulse or CANopen) and is programmable with SoMachine (now EcoStruxure Machine Expert). The TM258LF42DR is ideal for packaging, material handling, and textile machinery where relay outputs are needed for interfacing with contactors and solenoids.

Technical Specifications

• Model: TM258LF42DR

• Digital Inputs: 24 (24V DC, 8 high‑speed up to 100 kHz)

• Digital Outputs: 18 (relay, 2A per channel, individually isolated)

• High‑Speed Inputs: 8 (counting, interrupt, encoder)

• High‑Speed Outputs: 4 (PTO/PWM, 20 kHz)

• Communication:

• 1 × Ethernet (Modbus TCP)

• 2 × CANopen (master, up to 127 nodes)

• 1 × USB (programming)

• User Memory: 512 KB for program, 256 KB for data

• Motion Control: Up to 4 axes (electronic gearing, camming)

• Power Supply: 24V DC (20.4–28.8V)

• Operating Temperature: 0°C to 55°C

• Protection Rating: IP20

• Dimensions: 130 mm × 120 mm × 90 mm

I/O and Expansion

The relay outputs are suitable for switching AC or DC loads up to 2A. They are grouped as 4 commons (each common serves 4 or 5 outputs). The inputs are type 3 (IEC 61131‑2). The controller can be expanded with up to 7 TM2 or TM3 expansion modules, adding digital/analog I/O, temperature measurement, and counter modules.

Programming and Software

Programming is performed with SoMachine V4.3 or EcoStruxure Machine Expert. Languages supported: Ladder Diagram (LD), Structured Text (ST), Function Block Diagram (FBD), Sequential Function Chart (SFC), and Instruction List (IL). The software includes a CANopen configuration tool and a motion editor for cam profiles.

Applications

The TM258LF42DR is used in packaging lines (carton erectors, case sealers), conveyor systems, and small assembly machines. The relay outputs are ideal for driving pneumatic valves, motor starters, and indicator lamps.

Conclusion

The Schneider TM258LF42DR offers a balanced mix of digital I/O, relay outputs, and motion control in a compact package, making it a versatile choice for OEMs.