I. Basic Information (FC300B Specification)

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

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

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

Board Size: 235 × 140 mm (Half-length board)

Weight: Approximately 0.27 kg

Power Supply: DC 24V ±10% (20.4–26.4V), approximately 1.2 A (≈29W)

Operating Temperature: 0°C ~ +40°C

Version: FC300B (Rev.A03/B0); FC300B-3 is the common machine number

II. FC300B vs FC300 (Core Differences)

FC300B is the hardware optimized upgraded version of FC300, with fully compatible functions. The key improvements are in stability and compatibility: Table

Comparison item FC300 (original version) FC300B (upgraded version)

Hardware version Rev.A01/A02 Rev.A03/B0 (final version)

PCB material Standard FR-4 High Tg flame-retardant PCB, resistant to high temperature and humidity

Power supply anti-interference General Enhanced EMI filtering, 24V surge suppression

Bus driver Basic version Upgraded Mechatrolink-II transceiver, more stable communication

Soldering process Ordinary Lead-free process, longer lifespan in high-temperature workshop

Common problems Occasional bus packet loss, high-temperature alarm Repaired initial version bugs, stable long-term operation

Market status Outdated / Rare Mainstream circulation, priority replacement model

III. Core functions (same as FC300, more stable hardware)

1. 3-axis servo independent control

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

Total axis combination:

FC250 (8 axes) + FC300B (3 axes) = 11 axes

FC251 (12 axes) + FC300B (3 axes) = 15 axes

Up to 2 FC300B → 18 axes (I80 upper limit)

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

2. Interface and diagnosis

CN1–CN3: 3-axis servo output (Mechatrolink-II)

CN20: System parallel bus (connected to the backplane, communicates with FC250/FC251)

CN21: Cascading port (can connect a second FC300B)

LED: Power, bus, 3-axis status, alarm light, quick fault location

3. Motion control characteristics

3-axis linear / circular interpolation independent calculation, reducing the load on the main control

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

Rigid tapping, electronic gear: supports spindle synchronization and multi-axis synchronization ratio

IV. Compatibility and pairing (must be combined)

Main control board: JANCD-FC250 (standard) / FC251 (high-end)

Expansion board: JANCD-FC300B / FC300B-3 (1 = +3 axes)

PLC board: JANCD-FC210 / FC211

Backplane: JANCD-FC001

Cannot be used alone: must rely on FC250/FC251 power supply and scheduling

V. Common faults (FC300B less common)

A. 300 bus error: CN1–CN3 interface / cable damage

Bus light red, no response from 3 axes: CN20 backplane contact failure or bus chip failure

24V power light does not light up: backplane power supply abnormal or internal fuse melting

High-temperature alarm: cooling air duct blocked or environmental temperature exceeds the limit (improved in FC300B)

VI. Application scenarios

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

Small 3+2 five-axis, turning-milling combination

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

FC300 original version upgrade replacement (stability priority)