I. Product Introduction

Brand: Yaskawa

Model: JANCD-MB20 (Revision: Rev A01, Part Number: DF8101356)

Series: YASNAC J300 (Numerical Control) / JZNC-RK20 (Robot)

Function: System main control + Backplane bus + Power distribution + CPU / Memory integration

Alias: J300 Motherboard, RK20 Main Control Board, MB20 System Motherboard

Core Purpose:

As the core carrier of the J300 numerical control system, it is equipped with JCP10 CPU board, JSP spindle board, JMM memory board, and JIF communication board.

Used in the JZNC-RK20 robot control cabinet, it coordinates motion control, I/O, and external communication.

Provides system bus, power management, battery backup, and LED status indication.

II. Technical Parameters

1. System Core

CPU: 32-bit, with onboard slots for JANCD-PC20 CPU board

Memory: Onboard RAM + slots for JANCD-MM20 memory board

System Bus: J300 dedicated backplane bus (40-pin), connecting all subboards

Backup Battery: NEC 5.5V lithium battery (data retention)

2. Interfaces and Terminals

CN1: DC24V power input (system power supply)

CN2: Battery interface (5.5V, data backup)

CN3: Operation panel / MDI interface

CN4: RS-232C (upper computer / programmer)

CN5: I/O bus (connects external I/O units)

Backplane slots: JCP10 (CPU), JMM01/MM20 (memory), JIF10 (communication), JSP02/04/11 (spindle)

3. Electrical and Environment

Power Supply: DC24V ± 10%, power consumption approximately 50W

Size / Weight: Approximately 250×220×30mm, weight 2.5kg

Operating Temperature: 0–45℃, humidity 30%–85% (no condensation)

LED Indicators: PWR (power), SYS (system), BAT (battery), ERR (fault)

III. System Composition (Typical Configuration)

MB20: Motherboard (foundation)

PC20: CPU board (core computing)

MM20: Memory board (program/data storage)

JIF10: Communication board (networking / upper computer)

JSP04/JSP11: Spindle control board

CPS-10NB: Power unit (配套 RK20)

IV. Installation and Status

Installation： On the bottom motherboard slot of the J300 cabinet， fix and insert each subboard.

Normal power-on： PWR constantly on， SYS flashing， BAT constantly on， ERR off.

Battery Replacement： 5.5V lithium battery， life approximately 2–3 years， replace when BAT light is on.

V. Common Alarms

ALM01： System bus error → Check subboard insertion tightness， backplane contact

ALM02： Low battery voltage → Replace 5.5V lithium battery

ALM03： CPU abnormal → Check PC20 board， reinsert and replug