I. Basic Information

Model: CFP-DO-403 (cFP-DO-403)

Manufacturer: National Instruments (NI)

Series: Compact FieldPoint (cFP)

Part Number: 777318-403

Status: Obsolete (Out of Production)

Location: High-density 16-channel current sink output, compatible with 24V relays / solenoids / indicator lights

Output Type: Sink (Current Sinking, Low Level Active)

II. Core Specifications (Electrical / Channels)

Number of channels: 16 independent digital outputs

Output voltage: 5–30 VDC (compatible with 24V industrial standard)

Current per channel: 2 A (maximum), total module current 16 A

Conduction resistance: ≤ 0.3 Ω (low loss)

Logic levels:

ON (low): Output ≈ 0 V (Sink conducts, load current flows into the module)

OFF (high): Output ≈ Vsupply (Sink is cut off)

Isolation: 250 Vrms CAT II (channel - backplane isolation), withstand voltage test 2300 Vrms / 5 seconds

Response time: ≤ 1 μs (high-speed switching)

Update rate: 20 kHz (full channel)

Protection: Reverse polarity protection (±30V), independent overcurrent / short circuit protection per channel

Connector: 68-pin VHDCI female connector (requires CFP-CB-1 wiring base)

Indicator lights: 1 green LED per channel; 1 green LED for POWER/READY each

III. Mechanical and Environmental

Dimensions: 127 × 66 × 24 mm (standard cFP module)

Weight: Approximately 180 g

Installation: cFP-BP-4 / BP-8 backplane, hot-swappable (HotPnP)

Operating temperature: -40 °C ~ +70 °C

Storage temperature: -55 °C ~ +85 °C

Humidity: 10%–90% RH, no condensation

Vibration: 5 grms (random) / 5 g (sinusoidal), 10–500 Hz

IV. Wiring and Base

Must be paired with: CFP-CB-1 (36-pin universal wiring base)

Wiring specifications: 16–26 AWG copper wire, stripped 6 mm, torque 0.5–0.6 N·m

Power supply: External 5–30 VDC distributed to the module and load via CB-1

V. Compatibility

Backplane: cFP-BP-4 (4 slots), cFP-BP-8 (8 slots)

Controller: cFP-180x / 2000 / 2100 series

Software: LabVIEW, FieldPoint Explorer, Modbus RTU/TCP

VI. Discontinued Replacement (Direct Replacement)

Recommended replacement: NI-9476 (C series, 16-channel 24V Sink output, per channel 2A, isolation, direct replacement)

Base replacement: NI-9923 (C series universal terminal base)

VII. Typical Applications

16-channel relay / contactor control

24V solenoid valve, pneumatic valve drive

Indicator lights, buzzer alarm output

Small motor start-stop control

Industrial control cabinet I/O centralized control