Description
Product Introduction & Engineering Value
The 140NOE77100 is the communications layer between a Quantum PLC rack and Ethernet-based plant systems. In a typical installation, it may serve HMI, SCADA, engineering workstation, Modbus TCP device, or supervisory-network traffic while the PLC CPU continues handling the control application. Its dual RJ45 interfaces support Ethernet network connections at 10 or 100 Mbps.
Replacement work requires more than matching the connector. IP addressing, Modbus TCP device tables, routing, FTP/HTTP services, SNMP settings, firmware, and the application’s communication configuration may all be tied to the original module. A replacement that powers up but carries the wrong network configuration can still produce a complete SCADA outage.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 140NOE77100 |
| Platform | Modicon Quantum |
| Module Type | Ethernet TCP/IP communication module |
| Ethernet Ports | 2 × RJ45 |
| Ethernet Speed | 10/100 Mbps |
| Ethernet Standard | IEEE 802.3 |
| Network Protocol | TCP/IP |
| Application Protocols | Modbus TCP/IP, HTTP, FTP, SNMP |
| Web Services | HTTP server |
| File Transfer | FTP |
| Network Management | SNMP |
| Addressing | IP-based Ethernet addressing |
| Module Installation | Quantum backplane |
| Typical Communication | HMI, SCADA, programming, Modbus TCP devices |
| Bus Current | Approximately 450 mA |
| Power Dissipation | Approximately 2.5 W |
| Operating Temperature | 0–60°C |
| Storage Temperature | -40–85°C |
Schneider identifies the 140NOE77100 as a Quantum Ethernet TCP/IP module with two RJ45 ports and 10/100 Mbps capability. The module supports multiple Ethernet services rather than functioning solely as a basic network interface. (se.com)
Field Application & the “Trench” Experience
A legacy Quantum PLC continues controlling a process normally, but the operator stations suddenly lose live data. The PLC’s I/O remains healthy. Pumps are running. Interlocks are intact.
The problem is upstream.
The maintenance team checks the 140NOE77100. Link indicators show network activity, but the SCADA workstation cannot establish the expected Modbus TCP connection. Rather than immediately replacing the module, the technician compares the current IP configuration with the archived PLC/network documentation and checks the Ethernet switch port, cable, subnet, and Modbus TCP connection parameters.
That distinction is important. A healthy Ethernet link does not prove that application-layer communication is working.
Specific application scenarios:
- SCADA data acquisition: exchanging PLC registers with supervisory servers.
- Operator HMI networks: providing Ethernet access to Quantum process data.
- Modbus TCP device integration: connecting meters, drives, analyzers, and other Ethernet field devices.
- Engineering networks: supporting PLC programming and diagnostic access.
140NOE77100
140NOE77100
Transparency SOP: QA & Testing
For New Surplus or refurbished 140NOE77100 stock, communication testing should cover more than link LEDs.
- Catalog verification — Confirm
140NOE77100on the actual module. - Physical inspection — Check the housing, RJ45 connectors, backplane connector, status LEDs, and labeling.
- Controlled power-up — Install the module in a compatible Quantum rack.
- Ethernet link test — Verify both RJ45 interfaces establish physical Ethernet connectivity.
- IP communication test — Assign a controlled test configuration and verify network reachability.
- Modbus TCP test — Connect a suitable test client and verify register communication.
- Service verification — Where applicable, test HTTP, FTP, and SNMP functionality.
- Diagnostic check — Verify module status and network diagnostics.
- Final report — Document firmware/configuration state and classify the unit as New Surplus, Used, or Refurbished.
PRO TIP: For a communications module, “powers on” is a very weak test result. A meaningful QA report should identify which Ethernet and application-layer functions were actually exercised.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Link light does not equal Modbus TCP communication.
The RJ45 port can show physical Ethernet connectivity while the PLC remains unreachable at the application layer. Check IP addressing, subnet configuration, TCP services, and Modbus TCP parameters before replacing hardware.
⚠️ Trap #2 — Record the original IP configuration.
Before removing a failed 140NOE77100, document its IP address, subnet mask, gateway where applicable, connected switch ports, and the network role of each Ethernet port.
PRO TIP: Keep a screenshot or written record of the existing configuration with the spare-parts documentation. It is much faster than reconstructing network settings during a production outage.
⚠️ Trap #3 — Check firmware before loading an archived application.
Quantum Ethernet modules have firmware-dependent features and configuration requirements. Do not assume that an older application/network configuration can be transferred blindly to a module running a substantially different firmware revision.
⚠️ Trap #4 — Don’t confuse the 140NOE77100 with the CPU’s built-in Ethernet interface.
The 140NOE77100 is a dedicated Quantum Ethernet communication module. Its configuration and communication role can differ from an Ethernet interface integrated into a Quantum CPU. Confirm which network path the application actually uses before ordering a replacement.
Dynamic FAQ
Q: What is the Schneider 140NOE77100?
A: It is a Modicon Quantum Ethernet TCP/IP communication module with two Ethernet ports. It supports Ethernet-based communication services including Modbus TCP/IP.
Q: How fast is the 140NOE77100 Ethernet interface?
A: The module supports 10/100 Mbps Ethernet through its two interfaces.
Q: What protocols does the 140NOE77100 support?
A: Its Ethernet communication functions include Modbus TCP/IP, HTTP, FTP, and SNMP.
Q: What should I check before replacing a 140NOE77100?
A: Record the IP configuration, subnet/gateway settings, Ethernet port connections, Modbus TCP device configuration, SCADA/HMI communication parameters, firmware revision, and any active HTTP/FTP/SNMP configuration.
Q: Is the 140NOE77100 discontinued?
A: Yes. Schneider Electric lists the 140NOE77100 as discontinued. Because it can be deeply integrated into a legacy Quantum network, an exact spare can be useful when the immediate objective is restoring an existing system rather than beginning a network migration.
Q: How should New Surplus 140NOE77100 inventory be verified?
A: Confirm the exact catalog number, inspect both ports and the backplane connector, and request evidence of actual Ethernet communication testing. Ideally, the test should include IP connectivity and a Modbus TCP transaction rather than only a power-up check. The supplier should also state the New Surplus condition, test status, warranty period, and return terms.
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