Description
The Giddings & Lewis 502-04125-10R3 (often designated as 502-04125-10 or PIC900 CSMCPU) is a high-performance Programmable Industrial Controller (PIC) Central Processing / Motion Controller Module belonging to the G&L PIC900 series platform (now supported by Rockwell Automation / Giddings & Lewis legacy support). Designed for heavy-duty machine tool automation, multi-axis motion control, and high-speed discrete logic processing, the CSMCPU module coordinates synchronized servo axes and machine input/output routines across industrial manufacturing cells.
Key Specifications & Identification
| Attribute | Details |
| Manufacturer | Giddings & Lewis (G&L / Rockwell Automation legacy) |
| Model / Platform | PIC900 Series / CSMCPU Controller Module |
| Catalog / Assembly P/N | 502-04125-10R3 (Revision 3 / Series 10) |
| Primary Function | Central Processing & Multi-Axis Motion Control |
| System Architecture | Rack-mounted module for G&L PIC900 backplane chassis |
| Memory / Programming | Non-volatile user memory for ladder logic and motion application code |
| Communication Ports | Serial communication ports (RS-232/RS-485) for programming and operator terminal interface |
| Diagnostic Features | Onboard status LEDs (Run, Fail, Battery, Communications) |
Primary System Functions
- Synchronized Motion & Logic Execution: Combines deterministic ladder logic processing with high-speed multi-axis motion profiles to control complex machinery, such as CNC mills, metal formers, and automated transfer lines.
- Backplane Resource Management: Acts as the master processor for the PIC900 rack, managing backplane communications, servicing local digital/analog I/O modules, and coordinating data transfers across expansion racks.
- Servo Loop Control: Generates position and velocity commands for connected axis control modules, maintaining precise synchronization and profiling across multiple mechanical axes.
- Non-Volatile Memory Storage: Stores user application programs, system parameters, and machine configurations in onboard battery-backed RAM or EEPROM memory.
Servicing & Installation Guidelines
- RAM Battery Backup & Replacement: The module relies on an internal lithium battery to retain user logic and parameter memory when power is off. Periodically test or replace the battery according to maintenance schedules to prevent memory loss.
- Rack Insertion Safety: Always turn off rack power (chassis supply) before inserting or removing the PIC900 CSMCPU module to avoid electrical arcing, bus lockup, or damage to backplane connector pins.
- ESD Precautions: High-density microprocessors and memory ICs on the board are sensitive to electrostatic discharge. Always wear a grounded anti-static wrist strap during handling and maintenance.
- Software Tool Compatibility: Program backups, firmware updates, and online diagnostics typically require legacy G&L software suites (such as PiCPro) running on compatible programming terminals.
