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BMXNOC0401 Modicon M340 Ethernet network module

Schneider Electric M340 Ethernet TCP/IP module with four RJ45 ports and I/O scanning services.

System role

Rebuilt from individual evidence

Schneider Electric identifies BMXNOC0401 as a Modicon M340 Ethernet TCP/IP network module with four RJ45 10/100 ports.

The Schneider Electric data sheet documents Modbus TCP and EtherNet/IP I/O scanning and messaging, an embedded four-port switch, RSTP and port mirroring.

The module connects the Modicon M340 rack to Ethernet devices and exchanges control data through the documented network services.

Exact reference
BMXNOC0401
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
The module routes Modbus TCP and EtherNet/IP traffic for the M340 system.
System position
It sits between the M340 rack bus and the connected Ethernet control network.
Upstream / inputs
The M340 rack supplies the module and Ethernet devices supply network messages.
Downstream / outputs
The module scans, exchanges and diagnoses Ethernet control data for the M340 system.
Limitations
Unknown: the network topology, configured services, firmware and condition of an individual module.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

  • Schneider Electric identifies BMXNOC0401 as a Modicon M340 Ethernet TCP/IP network module with four RJ45 10/100 ports.

    Confidence: high

  • The Schneider Electric data sheet documents Modbus TCP and EtherNet/IP I/O scanning and messaging, an embedded four-port switch, RSTP and port mirroring.

    Confidence: high

Inferences

  • The module connects the Modicon M340 rack to Ethernet devices and exchanges control data through the documented network services.

    Confidence: medium

    Rationale: The documented product function and interfaces establish its position between the named upstream and downstream system stages.

Unknowns

  • Unknown: the network topology, configured services, firmware and condition of an individual module.

    Confidence: low

    Missing evidence: The captured sources do not inspect the individual unit or its installation configuration.

System position diagram

BMXNOC0401 connects the controller with the field system in the documented signal path.

Reading limit: system position only, not a wiring or safety drawing.

The module connects the Modicon M340 rack to Ethernet devices and exchanges control data through the documented network services.

Enlarged system diagram

BMXNOC0401 connects the controller with the field system in the documented signal path.

The module connects the Modicon M340 rack to Ethernet devices and exchanges control data through the documented network services.

View Mermaid source
flowchart LR; Controller --> Module; Module --> Field
View diagram labels
Nodes
Controller; BMXNOC0401; Field system
Edges
Control data; Processed signal

Next action

The captured manufacturer evidence supports publishing BMXNOC0401 with the documented system role.

Unknown: the network topology, configured services, firmware and condition of an individual module.

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