Compatibility

• FANUC CNC Series: 16i‑A, 18i‑A, 21i‑A (first‑generation i‑series controls)

• Controller: P90 controller with cache (early i‑series)

Key Specifications

• Processor: Intel Pentium (P90)

• Memory Support: DRAM slots for 4 MB / 8 MB / 12 MB modules

• Onboard Features: Integrated diagnostic LEDs for status monitoring

• Power: Low‑voltage DC (internal CNC bus powered)

• Environment: Industrial grade (0 °C to +55 °C, vibration/dust resistant)

Functions

• System Core: Executes CNC system software, PMC logic, and motion control algorithms

• Memory Management: Runs system programs, user programs, and data caching

• Bus Control: Manages internal CNC bus communication (I/O, axis cards, display)

• Diagnostics: LED indicators for power, reset, and error status

Applications

• Machine Tools: CNC mills, lathes, machining centers with 16i‑A / 18i‑A / 21i‑A systems

• Replacement: Direct replacement for failed CPU modules in existing FANUC i‑series controls

Notes

• Data Loss: Replacement requires restoring CNC parameters, programs, and tool data

• ESD Protection: Use anti‑static wrist strap during handling/installation