Schneider 140NOE31100C Communication Module — Installation & Running Code Guide - Excellent PLC

📘 1. Introduction

The Schneider 140NOE31100C is an Ethernet communication module for Modicon Quantum PLC systems.
It provides high-speed data exchange between the PLC and external devices such as HMIs, SCADA systems, and other Ethernet-enabled controllers.

This guide covers:

Physical installation in a Quantum PLC rack
Wiring and network connection
Software configuration in EcoStruxure Control Expert
Sample ladder logic code for basic communication test

⚙️ 2. Tools & Preparation

Anti-static wrist strap
Small flat-head screwdriver
Shielded CAT5e/CAT6 Ethernet cable
Laptop with EcoStruxure Control Expert
Industrial Ethernet switch for testing
Multimeter to verify backplane voltage

⚠️ Always disconnect the PLC power before module insertion.

🏗️ 3. Hardware Installation

Step 1 — Power Down the PLC

Turn off the main power supply to the PLC rack.

Step 2 — Module Mounting

Locate the slot for the 140NOE31100C module.
Align the module with the backplane guide rails.
Slide the module evenly until it clicks.
Secure it using the side locking screw.

⚠️ Avoid lateral force to prevent bent pins.

Step 3 — Ethernet Connection

Connect the RJ-45 port to your network switch.
Use shielded CAT5e/CAT6 cable to reduce interference.
Verify proper grounding.

🖥️ 4. Software Configuration

Open EcoStruxure Control Expert.
In the project, add the 140NOE31100C module in the corresponding slot.
Configure Ethernet settings:
- Static IP: e.g., 192.168.1.50
- Subnet Mask: 255.255.255.0
- Gateway: 192.168.1.1 (if needed)
Enable Modbus TCP or Global Data as required.
Download configuration to PLC.
Confirm module recognized and RUN LED is green.

🔍 5. LED Indicators Reference

LED	Color	Status	Meaning
RUN	Green	ON	Module initialized
ERR	Red	OFF	Normal
ERR	Red	ON	Hardware or configuration error
LINK	Green	ON	Ethernet link detected
ACT	Yellow	Flashing	Data transmission active

🧩 6. Sample Running Code

Below is a basic ladder logic example for Modbus TCP communication using 140NOE31100C.
This code polls a remote device at IP 192.168.1.100 and reads register 40001 into PLC memory.

(* Modbus TCP Read Example for 140NOE31100C *)

PROGRAM PLC_Main

VAR

mbReadResult : BOOL;

mbRegisterValue : INT;

END_VAR
(* Initiate Modbus TCP Read *)

mbReadResult := MB_TCP_Read(

Module := NOE31100C_Slot5,

RemoteIP := '192.168.1.100',

StartAddress := 40001,

Quantity := 1,

Data := mbRegisterValue

);
(* Check result *)

IF mbReadResult THEN

(* Successfully read register *)

(* Example: turn ON output if value > 100 *)

IF mbRegisterValue > 100 THEN

Q0.0 := TRUE;

ELSE

Q0.0 := FALSE;

END_IF

ELSE

(* Error handling *)

ERR_LED := TRUE;

END_IF

END_PROGRAM

💡 Pro Tip: Replace NOE31100C_Slot5 with the actual module variable name in your project.
Always verify remote IP and register addresses before running code.

🔧 7. On-Site Verification

Confirm RUN LED is solid green.
Ping the module from your PC to verify network connectivity.
Observe LINK and ACT LEDs during ladder code execution.
Check Modbus TCP registers read correctly in PLC memory.

🧰 8. Troubleshooting Common Issues

Symptom	Cause	Action
RUN LED off	Module not seated	Re-seat module
ERR LED on	Firmware mismatch	Update firmware
LINK LED off	Bad cable or switch port	Check cable, swap ports
Cannot read remote registers	IP mismatch or firewall	Verify IP, disable firewall temporarily
Intermittent communication	EMI interference	Use shielded cables, separate from high-power lines

✅ 9. Final Verification Checklist

[✔] Module securely installed in rack
[✔] Ethernet cable connected and grounded
[✔] Module recognized in Control Expert
[✔] RUN LED green, ERR LED off
[✔] Ping test successful
[✔] Ladder logic communication test passed

After these steps, the 140NOE31100C module is fully operational and ready for industrial Ethernet communication.

Troubleshooting