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Brand | Fanuc |
Status | NEW/USED |
Warranty | 12 months/3 months |
Type | Servo PCB A20B-2101-0891 |
High-precision control | Use advanced algorithms to achieve precise speed and position control and improve equipment performance. |
Efficient heat dissipation design | Optimize heat dissipation structure to ensure long-term stable operation and reduce failure rate. |
Modular integration | Compact design, easy to install and maintain, and supports flexible system expansion. |
The Fanuc A20B-2101-0891 Relay Display Access Controller Board is a critical PCB module used within various Fanuc CNC systems to manage relay logic, operator display functions, and communication between machine interface modules. This original OEM board ensures stable operation, accurate relay sequencing, and reliable communication signals in demanding industrial machining environments.
Engineered for long-term durability, the A20B-2101-0891 supports high-frequency switching operations and is widely used in CNC lathes, milling machines, machining centers, and automated production lines where system uptime is essential.
This board ensures:
Accurate control of machine relays
Stable signal output to the operator panel
Reliable monitoring of machine status indicators
Seamless coordination between CNC logic and external devices
Its precision relay operation minimizes control delays, which is critical for automation cycles and high-speed machining.
Key durability advantages include:
Heat-resistant PCB substrate
Reinforced solder joints for vibration-heavy machines
High-quality relay driver components
Corrosion-resistant connectors to prevent communication loss
This ensures consistent performance even under long production shifts, CNC cabinet heat cycles, and ambient shop-floor contaminants.
Commonly found in:
Fanuc 0i / 0i Mate systems
Fanuc 16i / 18i / 21i platforms
Customized controls used by major machine builders
Configuration may differ by OEM machine model—contact us for compatibility confirmation.
Replacement is typically required when symptoms include:
Inconsistent relay operation or stuck relays
Display or panel indicator malfunction
Loss of communication between the operator panel and CNC mainboard
Random alarms related to relay or panel I/O
Overheated or visibly damaged relay driver circuitry
These faults often stem from power supply fluctuations, coolant contamination, or long-term relay-cycle fatigue.
To ensure correct replacement, technicians should verify:
Current PCB Part Number (A20B-2101-0891)
Machine tool model & CNC control type
Operator panel configuration and relay count
Wiring diagram or I/O mapping sheet
Providing a photo of your existing board greatly speeds up verification.
Always power down the machine and discharge capacitors before replacement
Clean all connectors to avoid oxidation-based signal loss
Check for damaged wiring that may have caused the original failure
Run a relay test cycle through the CNC diagnostic screen after installation
Verify that operator panel LEDs and display signals respond correctly
Proper commissioning prevents unexpected alarms and ensures full system restoration.
It controls relay output, manages display and panel indicators, and handles communication between the CNC control and operator interface. Essentially, it serves as the relay logic hub for machine functions.
Common indicators include non-responsive relays, flickering display indicators, intermittent I/O errors, or CNC alarms related to panel communication.
Yes—if the root cause is isolated to the board. However, it's recommended to inspect:
Power supply modules
Wiring harnesses
Grounding and electrical noise sources
to prevent recurrence.
Repaired PCBs may temporarily work but often lack long-term reliability due to aged components. OEM-original boards like this one deliver superior stability and lifespan in production environments.
Typically no, but a system relay test and I/O confirmation should be performed. In rare cases, custom machine builders may require panel configuration checks.
✔ Direct source for original, in-stock Fanuc components
✔ Rapid global shipping to minimize downtime
✔ Expert technical support from experienced CNC professionals
✔ Competitive pricing for OEM replacement parts
✔ Trusted by maintenance teams, factories, and machine tool distributors worldwide
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