FANUC A02B-0306-B502 Series 31i-A5 CNC Controller Unit

FANUC A02B-0306-B502 Series 31i-A5 CNC Control Basic Unit

Technical Specifications

• Brand: FANUC
• Model: A02B-0306-B502
• Category: CNC Control Basic Unit
• Series: FANUC Series 31i-A5
• Configuration: LCD-mounted type, 2 slots
• Supply Voltage: 24 VDC ±10%
• Heat Output: 33 W (7.2" STN monochrome LCD-mounted type)
• Operating Temperature: 0 to 58 °C
• Storage/Transport Temperature: −20 to 60 °C
• Relative Humidity: 75%RH or less normal; up to 95%RH short periods (≤1 month), no condensation
• Built-in Ports: JD36A (RS-232C), JD51A (I/O Link), CD38A (Ethernet)
• Protocols: RS-232C, I/O Link, Ethernet
• Communication Expansion: Via backplane I/O modules and 2 onboard slots
• Dimensions: Outline drawing per B-63943EN/02 Appendix A
• Weight: ~2.2 kg
• Lifecycle: Legacy generation, superseded by Series 30i/31i/32i-B

Core Performance and Environmental Resilience

• The A02B-0306-B502 runs on a stable 24 VDC ±10% supply for consistent control performance.
• Two onboard slots accept option boards and reduce the need for external expansion hardware.
• A 33 W heat output matches the 7.2" STN monochrome LCD-mounted configuration.
• The control unit handles ambient temperatures from 0 to 58 °C during continuous operation.
• Storage and transport tolerate −20 to 60 °C without stressing internal electronics.
• Normal humidity stays at 75%RH or less, with short-term exposure up to 95%RH allowed.
• FANUC engineered the unit to resist electrical interference through shielded I/O Link and Ethernet ports.
• The two-slot layout supports flexible machine configurations while keeping the footprint compact.

Installation Guide

• Mount the A02B-0306-B502 in a clean cabinet with sufficient airflow and low vibration.
• Connect the 24 VDC supply through a dedicated circuit rated for ±10% voltage tolerance.
• Route the JD36A RS-232C cable away from high-current lines to reduce noise coupling.
• Link JD51A to the I/O Link bus and verify termination before you power the system.
• Attach CD38A Ethernet to the factory network using shielded twisted-pair cabling.
• Insert option boards into the two slots and secure them before energizing the unit.
• Confirm ambient temperature stays below 58 °C during a full load test run.
• Record the outline drawing dimensions from B-63943EN/02 Appendix A for panel clearance.

Package Contents

• One FANUC A02B-0306-B502 Series 31i-A5 CNC control basic unit
• One protective shipping carton with anti-static foam
• One connector protection set for JD36A, JD51A, and CD38A
• One quick reference label with port and slot identification
• Shipping via FedEx, UPS, or DHL according to your delivery preference

FAQ

• Q: What supply voltage does the A02B-0306-B502 require?
  A: The unit runs on 24 VDC ±10% and needs a dedicated supply circuit.
• Q: What does the two-slot configuration offer?
  A: Two onboard slots accept option boards for flexible I/O and function expansion.
• Q: Which communication ports come built in?
  A: The unit provides JD36A RS-232C, JD51A I/O Link, and CD38A Ethernet ports.
• Q: What is the operating temperature range?
  A: The control unit operates from 0 to 58 °C in normal ambient conditions.
• Q: How much heat does the unit produce?
  A: The 7.2" STN monochrome LCD-mounted type generates 33 W of heat output.
• Q: What is the unit weight for cabinet planning?
  A: The control unit weighs approximately 2.2 kg without packing materials.
• Q: Is the product new and in stock?
  A: We supply brand-new original units, and we keep stock available for immediate order.
• Q: How fast do you ship and which carriers do you use?
  A: We dispatch within 5 days using DHL, FedEx, or UPS.
• Q: What is your return policy?
  A: We support returns within 30 days of delivery.
• Q: Is this model still in active production?
  A: FANUC classifies the Series 31i-A5 generation as legacy and superseded by the B series.