Channel & Physical Interface Configuration

• Channel Definition: 32-channel sinking-only digital input (external device sources current into module pins), no inter-channel galvanic isolation, divided into 4 independent 8-channel banks for grouping wiring
• Matching Accessories: Exclusive pairing with cFP-CB-1 screw terminal blocks and cFP-BP-4/cFP-BP-8 backplanes; incompatible with old FP-TB series terminal bases
• Status Indicators: 2 global green LEDs (POWER, READY) + 32 miniature single-channel green LEDs, each channel directly displays high/low logic state
• Hot Swap Performance: HotPnP powered hot swapping, no backplane bus downtime or signal disturbance to adjacent cFP modules during live plugging
• Mechanical Parameters: Single-width compact cFP form factor, bare module weight 193 g, flame-retardant PC housing, IP20 indoor dust protection

Core Electrical Input Parameters

• Logic Voltage Threshold: OFF ≤5 VDC, ON ≥10 VDC; minimum 2 V input hysteresis to eliminate signal jitter caused by ground potential drift
• Input Current Spec: OFF state ≤150 μA leakage current; ON state ≥330 μA trigger current, matching standard NPN proximity sensors
• Input Impedance: Fixed 30 kΩ ±6% passive input impedance, stable for long-distance field wiring within 100 meters
• Overvoltage Graded Protection: 0~30 VDC continuous withstand for all 32 channels; 0~±60 VDC transient withstand for max 8 random channels simultaneously
• Input Response Latency: 80 μs hardware-level synchronous sampling delay, consistent across all 32 channels without skew

Isolation & Anti-Interference Design

• Multi-layer Isolation Structure: Independent module-to-module isolation and field-to-backplane isolation; adjacent modules will not be damaged by high-voltage surge crosstalk
• Dielectric Withstand Index: 2,300 Vrms 5-second transient impulse withstand, 250 Vrms continuous CAT II field-to-backplane isolation
• Noise Suppression Mechanism: Built-in RC low-pass filter on each channel, natural suppression of 50/60Hz power frequency interference without external components
• Reverse Voltage Protection: -30 VDC reverse bias withstand for full channels, preventing polarity reversal wiring errors from burning the module

Hazardous Location & Safety Compliance

• Explosive Environment Certification: UL/ATEX/IECEx certified for Class I Div 2 Groups A/B/C/D T4, Zone 2 non-sparking hazardous locations
• Basic Safety Standards: IEC 61010-1, UL 61010-1, CSA C22.2 No.1010.1, Pollution Degree 2 indoor dry environment only
• Altitude Derating: Isolation voltage reduced by 30% when operating above 2000m, no high-altitude overvoltage protection by default
• Backplane Power Consumption: 1 W static power consumption, ultra-low load with no heat accumulation during long-term operation

Environmental & Shock-Vibration Reliability

• Operating Temperature: -40 ℃ ~ 70 ℃ full-range rating with no parameter derating
• Storage Temperature: -45 ℃ ~ 85 ℃, 10%–90% RH non-condensing humidity for transportation and storage
• Random Vibration: 5 grms 10–500 Hz compliant with IEC 60068-2-64, suitable for vibrating pump and fan cabinet installation
• Mechanical Shock: 50 g 3 ms half-sine operational shock, 30 g 11 ms half-sine transportation impact shock
• EMC Grade: CE/FCC/C-Tick Class A industrial electromagnetic emission, compliant with EN 61326 industrial anti-interference 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 network controllers
• Matching Terminal Blocks: cFP-CB-1 universal screw terminal block, no need for isothermal terminal accessories
• Official Replacement Model: NI-9423 C-series 32-channel sinking digital input module for CompactRIO system migration
• Official Status: Fully end-of-life, NI stopped firmware updates and official after-sales repair, only aftermarket inventory available

Software Compatibility

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

Pros & Limitations

• Pros: 32-channel ultra-high density single-width design, graded overvoltage protection for mixed signal wiring, module-to-module surge isolation avoiding cascading damage, built-in hysteresis for on-site noise resistance, ultra-low backplane power consumption, full hazardous location certification, hot-swap maintenance capability
• Limitations: Sinking input only incompatible with PNP sensors, no inter-channel isolation requiring external isolation for high-noise sites, discontinued official technical support, limited 60V overvoltage only for partial channels

Official Product Images & Visual Reference

• Front Panel Render: Grey cFP standard housing, dense 32-channel status indicator array on front panel, dual global status LEDs
• Assembly Physical Photo: cFP-DI-304 paired with cFP-CB-1 installed on cFP-BP-8 backplane, on-site wiring finished state
• Side Pinout Marking: Side printed channel grouping and COM pin definition for quick field wiring checking
• Document Source: NI official user manual 373352D, unwatermarked original factory images and dimensional drawings