Product Details

Modicon 0-77-750-0251D2, also stamped 0777500251D2, is an upgraded revision legacy Ethernet TCP/IP communication module for Modicon Quantum PLC racks. This quantum network adapter delivers stable 10/100 Mbps Ethernet connectivity for the Quantum CPU, supporting Modbus TCP, SNMP and built‑in web server for rack diagnosis, data modification and remote status monitoring. It transmits real‑time discrete inputs, analog process values, alarm notifications and operator setpoints between the local Quantum controller, HMI, SCADA and other networked automation nodes. The module is fitted with a standard RJ45 copper port and clear front LEDs for link activity and fault indication, drawing power directly from the Quantum backplane. Its onboard communication processor offloads protocol handling from the main CPU to lower PLC scan load. The PCB receives conformal coating, with ESD and surge protection on the Ethernet line, so this ethernet tcp/ip module can operate reliably inside electrical cabinets exposed to vibration, dust and electromagnetic interference. As a discontinued scarce industrial spare, this modicon comms spare card acts as a drop‑in replacement to restore Ethernet communication for ageing Modicon Quantum automation racks.

Basic Parameters

Brand: Modicon (Schneider legacy)

Model: 0-77-750-0251D2, alternative marking: 0777500251D2

Product Type: Quantum Ethernet TCP/IP Communication Module

Compatible Rack: Modicon Quantum backplane and chassis

Network Speed: 10 / 100 Mbps auto-negotiation

Supported Protocols: Modbus TCP, SNMP, HTTP embedded web server

Interface: RJ45 copper Ethernet connector

Diagnostic: Web rack viewer, data editor, event logging

Indicators: Link, activity, module fault LED

Power Source: Supplied via Quantum rack backplane

Installation: Single-slot rack mount

Product Status: Discontinued legacy automation spare

Net Weight: Approximately 285 g

Supported Functions

This ethernet tcp/ip module manages all TCP/IP packet transmission and reception for the host Quantum PLC. The quantum network adapter sends process data, fault codes and diagnostic information over Ethernet, and receives remote control commands from supervisory systems. This modicon comms spare card supports static IP assignment, link failure detection and timeout reporting to the main CPU. When network communication is interrupted, it keeps the last valid process data to prevent sudden process disturbance. It supports multi‑node Modbus TCP polling and global data sharing across distributed Quantum racks. It works in coordination with Quantum CPU, discrete and analog I/O modules and remote I/O adapters to build a plant‑wide Ethernet distributed control network.

Core Functions

As a dedicated network gateway for Modicon Quantum, this ethernet tcp/ip module connects the internal rack bus to industrial Ethernet, enabling remote access and data exchange without extra protocol converters. Its embedded web diagnostic pages simplify field troubleshooting and parameter checking. This quantum network adapter works as a direct spare to rebuild stable high‑speed TCP/IP communication for legacy Modicon Quantum control systems.

Hardware Specifications & Environmental Features

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Compact industrial plastic single-slot module

Protection: ESD and surge suppression for Ethernet signal lines

Anti-interference: Isolated Ethernet transformer, EMI filtering circuit

Compatibility: Modicon Quantum CPU, Quantum I/O modules, Modbus TCP compatible devices

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm Quantum rack firmware compatibility, IP address configuration, subnet setting and web server access rights before ordering.

This is from our current stock.

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