Product Details

Modicon 0-77-750-0251C2 (also marked 0777500251C2) is a legacy ethernet communication module and reliable tcp/ip network adapter designed for Modicon Quantum PLC racks. This quantum comms card provides high-speed Ethernet connectivity for the Quantum CPU, supporting Modbus TCP, SNMP and embedded web server functions for remote diagnosis, data editing and rack status viewing. It exchanges real-time discrete signals, analog process values, alarm messages and setpoint instructions between the local Quantum controller, HMI, SCADA and other networked automation nodes. The module features a standard RJ45 Ethernet port, dedicated status LEDs for link, activity and fault indication, and it draws power directly from the Quantum backplane bus. Its onboard processor offloads network protocol processing from the main PLC CPU to reduce scan cycle load. With conformal coated PCB and robust surge suppression for the Ethernet line, this ethernet communication module can run stably in electrical cabinets with vibration, dust and electromagnetic interference. As a discontinued hard-to-source industrial spare, this tcp/ip network adapter serves as a drop-in replacement to restore Ethernet network communication for ageing Modicon Quantum automation racks.

Basic Parameters

Brand: Modicon (Schneider legacy)

Model: 0-77-750-0251C2, alternate marking: 0777500251C2

Product Type: Quantum Ethernet TCP/IP Communication Module

Compatible Rack: Modicon Quantum backplane and chassis

Network Rate: 10 / 100 Mbps auto-negotiation

Supported Protocols: Modbus TCP, SNMP, HTTP web server

Port: RJ45 copper Ethernet connector

Diagnostic Function: Built-in web rack viewer and data editor

Indicator LED: Link, activity, module fault status

Power Supply: Powered via Quantum rack backplane

Mounting: Single-slot rack insertion

Product Status: Discontinued legacy automation spare

Net Weight: Approximately 280 g

Supported Functions

This ethernet communication module manages all TCP/IP network traffic for the host Quantum PLC. The tcp/ip network adapter transmits process data, alarm codes and diagnostic information over Ethernet and receives remote operator commands from supervisory systems. This quantum comms card supports static IP configuration, network fault detection and event logging; it will report link loss and communication timeout to the main CPU. When network interruption occurs, it retains the last valid process data snapshot to avoid sudden disturbance to the running process. It supports multi-node Modbus TCP polling and global data exchange between distributed Quantum racks. It works seamlessly 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 communication module bridges the internal rack bus and industrial Ethernet, enabling remote access and data exchange without extra protocol converters. Its integrated web diagnostic tool simplifies on-site troubleshooting and parameter checking. This tcp/ip 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 assignment, network subnet setting and web access permission before ordering.

This is from our current stock.

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