Fives Group 502-02778-50 Interface Module

Technical Specifications

Model： 502-02778-50

Brand： Fives Group (Giddings & Lewis)

Product Type: Rack mount interface PCB assembly for legacy G&L CNC control system

Module Feature:

Function: System interface module for Fives Group CNC platform. Acts as signal bridge between CPU, I/O, motion and peripheral boards on the control rack. Distributes address, data and control signals, converts signal levels and performs bus buffering to guarantee reliable inter-module communication for heavy horizontal boring mills and large machining centers.

Bus interface: Parallel backplane bus for high-speed bidirectional module communication Onboard components: Bus buffer ICs, address decoding logic, signal level shifter, transient surge protection, data latch circuit

LED indicators: POWER, BUS, ACT, FAULT diagnostic lights

Hardware self-diagnosis: Backplane bus handshake test, data read/write verification, power-up integrity check

Programming software: Fives Group proprietary CNC software for bus diagnostic and hardware resource identification

Electrical Parameters

Backplane supply: +5VDC

Power consumption: Max 7.4W

Mechanical & Structure:

Mounting: Rack slot mount with gold finger edge connector

Weight: 0.92kg

Protection class: IP20

Environmental:

Operating temperature: 0℃ ~ +55℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: Manufacturer discontinued legacy CNC rack interface module

System compatibility

Compatibility description: 502-02778-50 belongs to Fives Giddings & Lewis legacy CNC rack family. Compatible with G&L CPU, memory, I/O and motion control boards. Widely installed on heavy Fives horizontal boring mills.

Function

Function description: 502-02778-50 is rack interface board manufactured by Fives Group (Giddings & Lewis). It serves as the central signal interface for the CNC rack backplane. The onboard bus buffers isolate different modules and prevent signal loading conflicts. It routes data, address and control signals between CPU and all peripheral rack boards, supporting coordinated operation of axis control, spindle and I/O functions. Integrated surge protection protects adjacent PCBs from electrical transients. It is legacy rack communication interface spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off rack +5V backplane power. Insert 502-02778-50 board into rack slot and secure gold finger connector. Check all adjacent module gold finger contacts. Restore rack power, verify BUS and ACT LED indicators, run bus diagnostic test and confirm cross-board data communication.

Interface

Interface list: Backplane gold finger connector, multi-channel signal header,on-board POWER / BUS / ACT / FAULT LED indicators for Fives Group 502-02778-50.

Diagnostic

Troubleshooting: Multiple rack modules not communicating: Check backplane power, gold finger contact or damaged bus buffer chip. FAULT LED lit: Bus contention, data parity error or power rail abnormality. Intermittent system crash: Signal noise, poor grounding or aging buffer components.

Product Brief

Brief description: 502-02778-50 is Fives Group legacy rack interface board,provides bus buffering and signal routing between CNC rack modules on heavy CNC boring mills,discontinued CNC system interface PCB spare.