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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | A20B-8200-0361 (suffixes: /01A, /03A, etc.) |
| Board Type | 2-Axis Servo Control PCB (Axis Card) |
| Compatible CNC Series | FANUC Series 0i-C (0i-MC, 0i-TC, 0i-Mate-C) |
| Number of Axes | 2 axes (FSSB interface) |
| Interface | FSSB (FANUC Serial Servo Bus) optical fiber |
| Axis Current Rating | 5 A per axis (typical for 0i-C servo modules) |
| Graphics Function | Dual function as graphics engine for small 0i-TC systems |
| Mounting | Plugin card onto main 0i-C PCB (e.g., A20B-8200-039x series) |
| Control Method | Sine Wave PWM with Transistor Bridges (via external servo amplifiers) |
| Encoder Support | Incremental/absolute (αi, βi series motors via FSSB) |
| Dimensions (approx.) | ~160 mm × 100 mm (varies by revision and suffix) |
| Weight | ~0.15–0.25 kg (board only) |
| Power Supply | Derived from main 0i-C control unit backplane |
| Operating Temperature | 0°C to +45°C (inside control enclosure) |
| Revision Suffixes | /01A, /03A, etc. (indicate hardware/firmware revision) |
| Typical Use | 2-axis CNC machines (lathes, small mills) with 0i-C control |
Product Introduction
The FANUC A20B-8200-0361 (A20B-8200-0361/01A, /03A, etc.) is a 2-axis servo control PCB used in FANUC Series 0i-C CNC systems (0i-MC, 0i-TC, 0i-Mate-C). It provides FSSB-based axis control for up to two servo axes and doubles as a graphics engine for smaller 0i-TC configurations.
This board is chosen for its compact 2-axis density, proven reliability in legacy 0i-C machines, and direct compatibility with FANUC αi/βi servo amplifiers via FSSB. It is a critical component for 2-axis CNC lathes and small mills where replacement availability is critical.
A20B-8200-0361/01A
A20B-8200-0361/01A
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| SV0401/SV0430 alarm (FSSB error) | FSSB communication fault or axis card failure | ✅ High | Check FSSB status on CNC diagnostic screen; verify optical fiber connections | Usually requires axis card replacement or FSSB configuration check |
| No display, dead control unit | Main PCB or power supply failure | ❌ Low | Measure 24 VDC at control unit power terminals; check main PCB status LEDs | Issue is likely at main PCB or PSU, not the axis card itself |
| Axis drift or following error | Encoder feedback loss, servo tuning, or axis card fault | ⚠️ Medium | Monitor encoder feedback on servo diagnostics; check FSSB cable integrity | Replace axis card if FSSB errors persist; re-tune servo if needed |
| Graphics display issues (0i-TC) | Graphics engine fault on axis card | ✅ High | Test display with known-good axis card; check LCD cable and backlight | Issue is likely at axis card graphics section; replace card |
| Intermittent axis faults | Loose connector, FSSB cable damage, or noise | ⚠️ Medium | Reseat FSSB and control connectors; inspect FSSB cable shielding and routing | Clean contacts, reseat firmly; replace FSSB cable if damaged |
| Board fails after swap | Wrong axis count (0360 vs 0361) or revision mismatch | ✅ High | Compare old board label (A20B-8200-0360 vs 0361, suffix) before removal | Match exact part number and axis count on replacement |
If you’re stuck, send photos of the board label, main PCB slot, and any CNC/servo alarm screens. We’ll review them before you commit to a swap.
Frequently Asked Questions (FAQ)
Q: What’s the difference between A20B-8200-0360 and -0361?
A: The -0360 is a 4-axis servo control PCB for 0i-C systems, while the -0361 is a 2-axis version. Both provide FSSB axis control and graphics engine functions, but the 0361 is limited to 2 axes and is commonly used in 2-axis lathes and small mills.
Q: Can I use this board in 0i-D or 0i-F series controls?
A: No. The -0361 is specific to 0i-C series controls. 0i-D and 0i-F series use different main PCBs and axis cards (e.g., -047x, -058x). Always match the board to the exact CNC series.
Q: Will my servo parameters and PMC ladder survive an axis card swap?
A: Yes. The servo parameters and PMC ladder are stored in the CNC memory (FROM/SRAM), not on the axis card itself. As long as you replace it with the same 2-axis card, the existing parameters remain valid. Always back up your CNC parameters before hardware changes.
Q: Is this board compatible with αi, βi, or βiS servo amplifiers?
A: supports FSSB-based αi and βi series servo amplifiers. βiS (analog) amplifiers are not FSSB-based and require different axis control architecture. Always match servo amplifier series to FSSB configuration.
Q: Why is this cheaper than buying a new control unit from FANUC?
A: This is new surplus or inspected stock from decommissioned systems and authorized distributors. It’s genuine FANUC hardware, function-tested, but sold as a component rather than a complete new control unit. That’s why the price is lower while still carrying a 1-year replacement warranty.
Q: What condition is the unit in—new, used, or refurbished?
A: We list each unit explicitly: “New Original / New Surplus” means factory-sealed or unused surplus with original packaging; “Refurbished (tested)” means cleaned, electrically tested, and verified functional in a 0i-C control test rig. The product page or quote will state which applies.
Q: Do you provide test reports or FSSB communication logs?
A: Yes. For refurbished units, we can supply a basic functional test report (power-up, FSSB handshake, axis enable verification, graphics output check) and short test video on request. Just ask before purchase.
