Giddings & Lewis 502-03853-20R3 CPU Module

Technical SpecificationsModel：502-03853-20R3 Brand：Giddings & Lewis Product Type: Single-slot plug-in PiC900 series main CPU processor module for PiC900 rack backplane

Module Feature:Function: PiC900 CNC core processor board, responsible for G-code interpretation, multi-axis motion interpolation, PLC logic execution, I/O scheduling and system alarm management for heavy horizontal boring mills and machining centers. Onboard memory: Flash memory for firmware; battery-backed RAM to retain part programs, machine parameters and offset data Backplane communication: High-speed parallel bus to exchange data with I/O, encoder and SERCOS modules Watchdog circuit: Hardware watchdog for system crash protection LED indicators: OK, RUN, FAULT diagnostic status lights Hardware self-diagnosis: Memory integrity test, backplane bus check, watchdog timeout detection, power rail monitoring Programming software: PiCPro for parameter download, part program management and module diagnostic testing

Electrical ParametersBackplane supply:+5V from PiC900 rack backplane Power consumption:Max 4.7W Battery:Onboard lithium backup battery for memory retention

Mechanical & Structure:Mounting:Plug into PiC900 rack single slot Weight:0.24kg Protection class:IP20

Environmental:Operating temperature:0℃ ~ +60℃ Ambient humidity:5~85% non-condensing Certification:CE Status:Manufacturer discontinued legacy CNC CPU module

System compatibility502-03853-20R3 belongs to Giddings & Lewis PiC900 control platform. Compatible with PiC900 backplane, SERCOS fiber communication boards, digital I/O, analog I/O and encoder feedback modules. Widely fitted on G&L 70A horizontal boring mills and PMC CNC boring machines.

Function502-03853-20R3 is PiC900 main CPU processor module manufactured by Giddings & Lewis. It is the central computing unit of PiC900 CNC system. It decodes G-code, calculates multi-axis interpolation trajectories, runs built-in PLC logic and communicates with peripheral modules over rack backplane. The backup battery preserves CNC parameters and programs during power loss. It is critical main controller spare for legacy heavy G&L CNC machine tools.

InstallationFollow lockout/tagout safety procedure before installation. Cut off rack backplane power. Insert 502-03853-20R3 module into PiC900 backplane slot and lock retainer. Check backup battery status before power-up. Download machine parameters and part programs via PiCPro. Power on rack and run self-test, then verify axis motion and I/O functions.

InterfacePiC900 backplane gold-edge connector,on-board OK / RUN / FAULT LED indicators for Giddings & Lewis 502-03853-20R3.

DiagnosticCPU boot failure:Check backplane +5V supply, module seating or failed backup battery. FAULT LED lit:Watchdog timeout, memory corruption or backplane communication error. No axis movement:Missing or misconfigured SERCOS communication module, incorrect parameter setup.

Product Brief502-03853-20R3 is Giddings & Lewis legacy PiC900 main CPU processor module,for G-code parsing and multi-axis motion calculation on heavy CNC boring mills,discontinued CNC CPU spare card.