I. Core Positioning and Function

This is a dedicated high-speed signal interface board for the LX3/i80 CNC and servo drive, spindle, and external I/O unit, used for high-speed data interaction between the CNC and servo/spindle, as well as between the CNC and external I/O modules.

Core Functions:

✅ Parallel Bus Communication: High-speed transmission of instructions and feedback between the CNC and servo/spindle

✅ I/O Expansion Interface: Connects remote I/O modules (such as JANCD-IO21)

✅ Position Feedback Processing: Preprocessing of encoder/gauge scale signals

✅ System Bus Bridging: Signal conversion between the backplane bus and external devices

II. Key Specifications

Interface: 2×50-pin high-density connector (CN1: bus, CN2: I/O expansion)

Communication Rate: High-speed parallel bus (compatible with LX3 CNC with 1ms interpolation cycle)

Power Supply: Backplane DC5V (±5%), Power Consumption ≤ 8W

Size: Standard JANCD large board (approximately 310×215 mm)

Environment: 0℃～45℃, 10%～90% RH (no condensation)

Board Number: DF820 series (exact as per the physical object)

III. Differences from Similar Models (CNC vs Robot) Table

Model Compatible System Type Key Differences

JANCD-IF21 LX3/i80 CNC High-speed I/F Interface Board Machine Bus Communication, 50-pin Interface

JANCD-IO21 LX3/i80 CNC Digital I/O Board 40 Input / 40 Output, Terminal Rack Connection

JANCD-YIF21-E DX200 Robot Robot Interface Board Servo / Encoder Signals, Robot-specific

JANCD-I0OIB XRC Robot Standard I/O Board 40 Input / 40 Output, Peripheral Connection

IV. Common Faults and Troubleshooting

Communication Error (CNC displays ALM40x):

Clean the gold fingers, replace the slot

Check if the pins of CN1/CN2 connector are bent

Measure the DC5V on the backplane

I/O No Response:

Confirm that the I/O module connected to CN2 matches (e.g. IO21)

Check the module power supply and address setting

Overheating and System Crash:

Clean the cooling fan and air duct of the control cabinet

Check if there are bulges or burn marks on the capacitors and chips on the board