YASKAWA JANCD-BB50 System Bus Backplane Product Description

1. Basic Information

Brand: YASKAWA (Yaskawa Electric)

Model: JANCD-BB50 (Derived Model: JANCD-BB50B)

Part Number: DF8203829-A0 (REV.A0 / REV.B)

Alias: JZNC-JRK00LB-611 (Matching Rack Assembly)

Product Type: CNC / Robot Controller System Bus Backplane (Backplane Board)

Origin: Japan

Board Label: JANCD-BB50 DF8203829-A0 REV.A0

Weight: Approximately 0.8 - 1.0 kg

Dimensions: Approximately 220mm × 150mm × 20mm 

II. Applicable System

Yaskawa Yasnac J50 series CNC controller (core baseboard)

Yaskawa Motoman early robot controller (MRC / XRC small system)

Compatible with JANCD series J50 dedicated board cards (CPU, servo, I/O, communication board)

III. Core Functions

JANCD-BB50 is the central interconnection baseboard of the J50 system, responsible for power supply and signal transmission of all modules:

Special bus distribution: Provides 8-slot J50 exclusive parallel bus, connecting CPU, servo, I/O and other board cards

Centralized power management: 24V DC main power supply is distributed to each slot, with independent overcurrent protection

Signal isolation transmission: All control / address / data buses are fully electrically isolated to suppress interference

System stability guarantee: Bus clock synchronization, short circuit protection, power filtering

Rack expansion support: Supports single / dual rack cascading, expanding I/O and axis control capabilities

Status real-time monitoring: Power, bus, fault status LED indication

IV. Hardware Specifications

1. Electrical Parameters

Power supply voltage: 24V DC ±10% (main power input)

Self power consumption: ≤6W

Bus standard: Yaskawa J50 dedicated parallel bus

Number of slots: 8 standard JANCD slots (including 1 CPU dedicated slot)

Protection mechanism: Each slot has independent fuse (overcurrent protection), bus short circuit protection

Isolation voltage: ≥1500V AC (bus - power side)

EMC standard: Complies with EN61000-6-2 industrial-level anti-interference

2. Physical and Environment

PCB material: FR-4 industrial-grade multilayer board, gold-plated bus contacts

Installation method: Controller rack direct insertion installation (配套 JZNC-JRK00LB rack)

Operating temperature： 0°C ~ +45°C

Storage temperature： -20°C ~ +60°C

Environmental humidity： 10%–80% RH (no condensation)

Anti-vibration： 10–55Hz， ≤4.9m/s²

Protection grade： IP20 (installed in control cabinet)

V. Interface and Structure

Power input： 24V DC large current terminal

Bus slots： 8 × JANCD gold finger edge connectors

Expansion ports： Rack cascading interface (connects to expansion backplane)

Status LED：

PWR (green)： 24V power is normal

BUS (green)： Bus is activated

ALM (red)： Bus / power failure

Ground terminal： Independent protection ground (PE)

Fixing method： Screw locking + rail clip

VI. Product Features

Core baseboard of the J50 system： Yasnac J50 CNC essential basic component， without this board， the system cannot start

Compact design with 8 slots： Suitable for small controllers， saving installation space

High-reliability industrial grade： Gold-plated contacts， anti-interference circuit， MTBF > 120，000 hours

Full isolation anti-interference： Three-layer isolation of bus / power / signal， suitable for strong electromagnetic workshop environment

Perfect compatibility： Supports the entire series of JANCD board cards of J50 (CPU， servo， I/O， communication)

Maintenance convenient： LED status lights quickly locate power / bus faults

Dual rack expansion： Supports system expansion， meeting multi-axis / multi-I/O requirements

VII. Installable Board Cards (Typical Configuration)

CPU board： JANCD-CP50 / CP50B (J50 main CPU)

Servo control board： JANCD-SV50 / SV51 (axis control module)

I/O board： JANCD-IO50 / IO51 (general digital I/O)

Communication Board: JANCD-COM50 (RS-232 / RS-485 communication)

Special Function Board: JANCD-AX50 (Additional Axis Control), JANCD-PWM50 (Pulse Output)

VIII. Application Scenarios

Yasnac J50 CNC Controller Core Bus Base Board

Small ABB Robot Control System (Early Models of MRC)

Maintenance and Replacement of CNC Lathe / Milling Machine / Grinding Machine J50 System

Upgrade and Expansion of J50 Controller for Old Automation Equipment

Small Multi-axis Motion Control System

IX. Related Models

JANCD-BB50B: BB50 Upgrade Version, Enhanced Bus Driver and Protection

JANCD-BB01 / BB02 / BB03: XRC Series 8/12/14 Slot Backboard

JANCD-B: Early Small Simple Backboard for MRC/XRC

JZNC-JRK00LB-611: Standard Frame Assembly for BB50

X. Usage and Maintenance Precautions

Installation / Disassembly must be completely powered off, release static electricity from the human body before operation

Ensure stable 24V DC power supply, ripple < 5%

Good grounding (grounding resistance < 4Ω), reduce interference risk

Board cards should be firmly inserted and tightened, no oxidation, dust, or deformation on the gold fingers

Do not plug or unplug the board cards while powered on, to avoid burning the bus and modules

When replacing, strictly check the model JANCD-BB50 and the revision version

Regularly check for looseness, burning, and color changes at the power terminals and slots

XI. Common Faults and Diagnostics

PWR light does not light up: 24V input failure, main fuse blown, power terminal loose

ALM light constantly on: Bus short circuit, failure of some board card pulling down the bus, overcurrent protection triggered

System cannot start: Backboard bus failure, CPU slot contact不良， abnormal clock signal

Board card not recognized： Slot contact不良， corresponding slot fuse blown， bus driver abnormal