FP-DO-400
May 15, 2026

FP-DO-400

The FP-DO-400 / cFP-DO-400 is an 8‑channel sourcing digital output module for NI FieldPoint and Compact FieldPoint distributed I/O systems. It controls 5–30 VDC devices with high current capability and is designed for industrial automation, relay/valve control, and general discrete output applications. It supports hot‑swapping and includes built‑in diagnostics for easy maintenance.

Description

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FP-DO-400 / cFP-DO-400

National Instruments FieldPoint / Compact FieldPoint 8‑Channel Sourcing Digital Output Module

Status: Legacy / EOL (still widely used in installed base)

General Description

The FP-DO-400 / cFP-DO-400 is an 8‑channel sourcing digital output module for NI FieldPoint and Compact FieldPoint distributed I/O systems. It controls 5–30 VDC devices with high current capability and is designed for industrial automation, relay/valve control, and general discrete output applications. It supports hot‑swapping and includes built‑in diagnostics for easy maintenance.

Part Numbers

  • Model: FP-DO-400 (FieldPoint) / cFP-DO-400 (Compact FieldPoint)

  • NI PN: 777318‑400 (cFP-DO-400)

Key Specifications

  • Channels: 8 × sourcing digital outputs

  • Voltage Range: 5–30 VDC

  • Output Current (10–30 VDC):

    • Per channel: 2 A max

    • Total (all channels): 8 A max

  • Output Current (5–10 VDC):

    • Per channel: 0.67 A max

    • Total: 1.35 A max

  • Update Rate: 20 kHz (all channels)

  • Isolation: 2,300 Vrms bank isolation (no channel‑to‑channel isolation)

  • Indicators: Green LED per channel (ON/OFF status) + POWER LED

  • Operating Temperature: ‑40 °C to +70 °C

  • Hot‑Swappable: Yes

  • Dimensions (cFP-DO-400): 4.2 × 4.3 × 3.6 in (106.7 × 109.2 × 91.4 mm)

  • Weight: 4.8 oz (136 g)

Main Features

  • High‑current sourcing outputs: Directly drive relays, valves, indicators, CMOS/TTL devices

  • Wide voltage support: 5–30 VDC covers most industrial discrete devices

  • Hot‑swap capable: Replace modules without shutting down the system

  • Optical bank isolation: 2,300 Vrms protects against voltage transients

  • Built‑in diagnostics: Simplify troubleshooting and maintenance

  • Common ground plane: Simplifies field wiring

Applications

  • Industrial automation & machine control

  • Relay, solenoid, and valve driving

  • Indicator lights and panel displays

  • CMOS/TTL device control

  • Distributed I/O in process control

  • Retrofit and replacement of legacy FieldPoint systems

Compatibility

  • Works with FieldPoint (FP) and Compact FieldPoint (cFP) chassis/network modules

  • Programming: LabVIEW, LabWindows/CVI, NI-DAQmx

Replacement Note

For new designs, migrate to NI CompactRIO (cRIO) with C‑Series digital output modules (e.g., NI‑9472) for higher performance, tighter integration, and modern OS support.


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