TM258LF42DT Schneider Electric Modicon M258 compact logic controller

Controls machine logic and coordinates integrated I/O for an M258 machine-control system. The captured evidence defines the documented system role; installation-specific limits remain explicit.

Documented system function

Rebuilt from individual evidence

System position

Unknown: Evidence boundary

The captured M258 hardware documentation identifies TM258LF42DT as a compact M258 logic-controller base with 42 I/O.

Controls machine logic and coordinates integrated I/O for an M258 machine-control system.

The controller connects machine I/O and CANopen field devices to the M258 control system.

Sits between field I/O and connected CANopen devices as the central M258 logic stage.

Upstream: Receives field input states and a machine-control program from the M258 system.

Downstream: Sends output states and CANopen control data to downstream machine devices.

Unknown: The captured sources do not establish the installed wiring, firmware, unit condition, site configuration, or current availability.

Exact reference: TM258LF42DT
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Controls machine logic and coordinates integrated I/O for an M258 machine-control system.
System position: Sits between field I/O and connected CANopen devices as the central M258 logic stage.
Upstream / inputs: Receives field input states and a machine-control program from the M258 system.
Downstream / outputs: Sends output states and CANopen control data to downstream machine devices.
Limitations: Unknown: The captured sources do not establish the installed wiring, firmware, unit condition, site configuration, or current availability.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The captured M258 hardware documentation identifies TM258LF42DT as a compact M258 logic-controller base with 42 I/O.
Confidence: medium
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence
Controls machine logic and coordinates integrated I/O for an M258 machine-control system.
Confidence: medium
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence
The controller connects machine I/O and CANopen field devices to the M258 control system.
Confidence: medium
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence

Inferences

Inferred system position: Sits between field I/O and connected CANopen devices as the central M258 logic stage.
Confidence: medium
Rationale: The source-backed product identity, documented function, and documented interface establish the adjacent stages; the stated system placement is an explicit inference.
- www.nexinstrument.com — retrieved 2026-09-12; medium confidence

Unknowns

Unknown: The captured sources do not establish the installed wiring, firmware, unit condition, site configuration, or current availability.
Confidence: low
Missing evidence: The captured sources do not establish the installed wiring, firmware, unit condition, site configuration, or current availability.

System position diagram

Diagram showing TM258LF42DT between its documented upstream and downstream system stages. — System position of TM258LF42DT inferred from the captured evidence.

View Mermaid source

flowchart LR\n  upstream["Receives field input states and a machine-control program from the M258 system."] --> item["TM258LF42DT"]\n  item --> downstream["Sends output states and CANopen control data to downstream machine devices."]

View diagram labels

Nodes: Receives field input states and a machine-control program from the M258 system.; TM258LF42DT; Sends output states and CANopen control data to downstream machine devices.
Edges: Documented upstream signal path; Documented downstream control path

Next action

Decision: The captured evidence supports a concrete system role for TM258LF42DT; verify the installation details before replacement.

Next action: Verify the installed I/O map, CANopen network, and machine program against the captured hardware documentation.

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