I. Basic Information

Material Number: DF920040-D0 (FC300B Rev.B0)

Compatible System: YASNAC I80 / I80M (must be paired with FC250/FC251 mainboard)

Assembly Backplate: JANCD-FC001 (I80 standard backplate, single slot)

Board Size: 235 × 140 mm (I80 half-length board, shorter than FC250)

Weight: Approximately 0.27 kg

Power Supply: DC 24V ±10%, approximately 1.2 A (power consumption ≈ 29W)

Operating Temperature: 0°C ~ +40°C

Version: FC300B (Rev.A03/B0, final production version)

II. Core Functions (Independent 3-axis Servo Control)

1. Axis Expansion Capability (Core)

Independent control of 3-axis servo (Mechatrolink-II bus, dedicated feed axis)

Total axis combinations:

FC250 (8 axes) + FC300 (3 axes) = 11 axes

FC251 (12 axes) + FC300 (3 axes) = 15 axes

Up to 2 FC300s can be inserted, expanding to 18 axes (within the I80 limit)

Interpolation Cycle: 125μs (standard) / 62.5μs (with FC251 automatic speed increase)

2. Interface Configuration (Special Servo Channels)

CN1–CN3: 3-axis servo outputs (Mechatrolink-II, blue D-Sub 50-pin)

CN20: System parallel bus (connects to the backplate, high-speed communication with FC250/FC251)

CN21: Cascading port (can connect to a second FC300)

LED Diagnostic Lights: 3-axis status + power + bus + alarm, quick fault location for individual axis failure

3. Motion Control Characteristics (Special Feed)

3-axis linear / circular interpolation independently calculated, reducing the load on the mainboard

Servo Synchronization Precision: ±1μs, suitable for 3-axis linkage machining centers

Rigid Drilling: Supports M06/M19 spindle synchronization, fast response

Electronic Gears: 3-axis interconnection can set synchronization ratios, suitable for synchronous lathes / grinders

4. System Monitoring and Diagnosis

Real-time Monitoring: 3-axis current, position deviation, temperature, communication status

Fault Isolation: A single-axis failure does not affect the operation of the mainboard and other axes

Alarm Codes: Unified with the I80 system, displayed directly on the panel (e.g. A.300 bus error)

III. Compatibility and Pairing

✅ Required Combination (3-axis Expansion Scenario)

Mainboard: JANCD-FC250 (standard) / FC251 (high-end)

Expansion Board: JANCD-FC300B (1 board = +3 axes, 2 boards = +6 axes)

PLC Board: JANCD-FC210 / FC211

Backplate: JANCD-FC001

✅ Replacement and Restrictions

Replace FC240/FC242: FC300 is a pure servo-specific board, more stable than FC24x, with high cost-effectiveness for 3-axis scenarios

Cannot be used alone: Must rely on the power supply and scheduling of FC250/FC251 mainboard

Incompatible with Old Systems: Only I80/I80M, cannot be used for I60/C70

Cascading Limit: Up to 2 FC300s, total axis number ≤ 18 axes

IV. Common Fault Phenomena

Axis servo alarm "A.300 bus error" → CN1–CN3 interface damage or bus cable break

3 axes no response, LED bus light red → CN20 backplate contact failure or bus chip failure When performing coordinated processing, the contour error is large → The interpolation cycle does not match (not paired with FC251) or the servo parameters have drifted

The 24V power indicator does not light up → The backplane power supply is abnormal or the internal fuse of the board has blown

V. Differences between FC300, FC260, and FC240 Table

Project FC300 (3-axis dedicated) FC260 (8-axis dedicated) FC240 (general 4-axis)

Extended axis count 3-axis servo 8-axis servo 4-axis servo + IO

Board size Half length (235mm) Full length (267mm) Full length (267mm)

Power consumption ≈29W ≈7.5W ≈10W

Interpolation operation Independent 3-axis operation No independent operation No independent operation

Applicable scenarios 3-axis / 4-axis small and medium-sized machine tools 16–24-axis large machine tools 8–12-axis general machine tools

Price Medium High Medium

VI. Application scenarios

I80 system 3-axis / 4-axis machining centers, CNC lathes

Small five-axis machine tools (3+2 axes), turning-milling combination

Special 3-axis synchronous equipment (such as grinding machines, hobbing machines)

Upgrade of the original FC240 system for 3-axis scenarios, improving stability