Channel & Physical Interface Configuration

• Channel Definition: 16-channel sinking-only digital output (current flows into module pins), zero inter-channel galvanic isolation, 8 shared VSUP and 8 shared COM public terminals
• Matching Accessories: Paired exclusively with cFP-CB-1 screw terminal blocks and cFP-BP-4/cFP-BP-8 backplanes; incompatible with traditional FP-TB series terminal bases
• Status Indicators: 2 global green LEDs (POWER, READY) + 16 tiny single-channel green LEDs for real-time on-state monitoring
• Hot Swap Performance: HotPnP powered hot swapping, no backplane bus crash or adjacent module data loss during plug-and-play
• Mechanical Parameters: Single-width compact cFP form factor, bare module weight 110 g, flame-retardant PC housing, IP20 indoor protection

Core Electrical Output Parameters

• External Supply Voltage Range: 5–25 VDC (full temperature rating); 25–30 VDC (derated to -40 ℃ ~ 50 ℃ only)
• Per-Channel Current Rating: 2 A continuous sinking current, on-state output impedance fixed at 0.12 Ω, causing 0.12 V voltage drop per 1 A load current
• RSS Squared-Sum Current Limit: ≤16 A² total power at -40~60 ℃; ≤12 A² at 60~70 ℃, the core thermal protection mechanism to avoid uneven channel heating
• Off-State Characteristics: Maximum 50 μA residual leakage current, negligible for low-power relay loads below 1 W
• Switching Latency: 50 μs hardware-level deterministic response delay, suitable for fast interlock logic control

Load Protection & Wiring Restrictions

• Onboard Flyback Suppression: Built-in miniature flyback diodes for transient voltage clamping, only valid for low-energy inductive loads below 20 mH
• Inductive Load Mandatory Rule: External freewheeling diode must be installed within 45 cm of solenoid/relay coils to prevent MOSFET breakdown; onboard diodes cannot replace external protection
• Short-Circuit Risk Warning: Output pins cannot short to VSUP positive rail, which will cause irreversible single-channel burnout without external fuses
• Recommended Fuse Specification: 2 A fast-blow 250 V fuse for each VSUP branch to meet CAT II overcurrent protection standards

Isolation & Hazardous Location Safety Compliance

• Isolation Structure: Complete double galvanic isolation between field output side and backplane communication/power bus; no isolation between adjacent output channels
• Dielectric Withstand Index: 2,300 Vrms 5-second transient impulse withstand, 250 Vrms continuous CAT II field-to-ground isolation
• Explosive Environment Certification: UL/ATEX/IECEx certified for Class I Div 2 Groups A/B/C/D T4, Zone 2 AEx nA IIC T4 hazardous locations
• Basic Safety Standards: IEC 61010-1, UL 61010-1, Pollution Degree 2, maximum safe operating altitude 2000 m
• Altitude Derating: Isolation voltage reduced by 30% when operating above 2000 m to comply with insulation safety requirements

Environmental & Shock-Vibration Reliability

• Operating Temperature: -40 ℃ ~ 70 ℃ (≤25 V supply); -40 ℃ ~ 50 ℃ (25–30 V supply)
• Storage Temperature: -45 ℃ ~ 85 ℃, 10%–90% RH non-condensing humidity for storage and transportation
• Random Vibration: 5 grms 10–500 Hz compliant with IEC 60068-2-64, adaptable for vehicle-mounted cabinet scenarios
• Mechanical Shock: 50 g 3 ms half-sine operational shock, 30 g 11 ms half-sine transportation shock
• EMC Grade: CE/FCC/C-Tick Class A industrial electromagnetic emission, compliant with EN 61326 industrial immunity standards

Compatibility Matching List

• Matching Backplanes: cFP-BP-4 (4-slot), cFP-BP-8 (8-slot) Compact FieldPoint backplanes
• Matching Controllers: cFP-2120, cFP-2220 Ethernet remote FieldPoint controllers
• Matching Terminal Blocks: cFP-CB-1 universal screw terminal block (no need for isothermal version)
• Official Replacement Model: NI-9474 C-series 8-channel high-current sinking DO module for CompactRIO migration
• Official Status: Fully end-of-life, no official firmware updates or new stock, only aftermarket inventory and third-party repair

Software Compatibility

• Required Drivers: NI-FieldPoint legacy driver suite, NI-VISA backend auxiliary driver
• Configuration Tools: NI MAX, FieldPoint I/O standalone configuration utility
• Development Software: LabVIEW 2019 and earlier versions, LabWindows/CVI
• Supported OS: Windows XP/7/10; no native Windows 11 driver compatibility, incompatible with LabVIEW 2021+ new versions

Pros & Limitations

• Pros: Industry-leading 2 A per-channel sinking drive capacity, rigorous RSS thermal current limiting to avoid module burnout, dual-layer multi-indicator status feedback, wide extreme temperature adaptability, explosive environment certification, hot-swap online maintenance, high transient isolation withstand
• Limitations: Sinking-only output unable to drive high-side referenced loads, no inter-channel isolation requiring external isolation for mixed hazardous circuits, strict temperature-based current derating, outdated legacy driver ecosystem

Official Product Images & Visual Reference

• Front Panel Official Render: Grey compact cFP housing, front dual global LEDs + 16 miniature channel status lights, rear gold finger backplane connector
• Assembly Physical Photo: cFP-DO-403 installed with cFP-CB-1 terminal block on cFP-BP-8 backplane, complete wiring assembly
• Module Side Marking Photo: Side printed pin assignment diagram for on-site quick wiring query
• Document Source: NI official manual 373354C, unwatermarked factory original pictures and dimensional drawings