II. Model Interpretation

PXI: 3U single slot, standard PXI bus (compatible with PXIe hybrid slot), NI.

6529: 652x isolated DIO series, 48-channel pure isolated input model.

Architecture: 48 independent optically isolated DI, each channel independently referenced and completely isolated between channels.

Part Number: 779949-01NI.

Position: Preferred high-density isolated monitoring for medium voltage (≤60 V) at medium voltage level.

III. Technical Parameters (25℃)

Digital Input (DI)

Channels: 48 independent optically isolated DI (pure input)

Voltage Range: -60 VDC to +60 VDC (industrial wide voltage)

Logic Threshold: Low ≤ 1 VDC, High ≥ 3.2 VDC

Isolation: 60 VDC continuous between channels, 60 VDC between channel and ground

Input Current: Maximum 3 mA/channel

Input Filtering: Software programmable debounce (digital filtering) NI

Response Delay: Typical 65 μs

Signal Type: Sink/Source compatible (NPN/PNP universal)

Physical and Environmental

Size: 3U single slot (160×100 mm)

Operating Temperature: 0 to 55℃ NI

Power Consumption: +5 V@250 mA, +3.3 V@150 mA (approximately 1.7 W)

Certification: UL, CE, Measurement Category II (≤60 V) NI

IV. Interface and Communication Configuration

Front Panel Interface: 100-pin keyed SCSI master connector (error-proof insertion)

Adapter Cable: SH100-100, R10005050 (100-pin adapter cable)

Terminal Box: CB-100, SCB-100A (with isolation terminals)

Bus: PXI (PCI, trigger, 10 MHz reference clock, RTSI synchronization)

Driver: NI-DAQmx, supports LabVIEW, Python, C#, TestStand

Synchronization: PXI trigger bus / RTSI, multi-module synchronous acquisition

V. Core Functions

48-channel fully isolated medium voltage acquisition: Single card monitoring of 48 ±60 V sensors / contacts, 60 VDC channel-to-channel isolation completely cuts ground loop, pure input design focuses on high-density monitoring.

Wide voltage bidirectional compatibility: -60 to +60 VDC covers 24/48 V industrial standards, Sink/Source universal, compatible with NPN/PNP sensors, dry contacts, active signals.

Industrial-grade anti-interference and diagnosis: Programmable digital filtering for debouncing to prevent erroneous triggering, change detection event reporting, RTSI real-time synchronization for multi-module timing alignment.

High-density single slot: 48-channel 3U single slot, saves chassis slots, suitable for large-scale medium voltage isolated monitoring systems.

VI. Application Scenarios

Industrial Automation "High-density isolated monitoring": PLC expansion of 48 DI, 24–48 V sensor cluster acquisition, production line status / limit / button monitoring, no output requirement pure monitoring station NI.

Power and Energy Systems: State monitoring of low-voltage switch cabinets (≤60 V), relay protection contact acquisition, battery management system (BMS) voltage / status monitoring, isolated monitoring circuits.

Automotive Electronic Testing: 12/24/48 V system switch quantity acquisition, body control module (BCM) contact monitoring, low-voltage circuit status acquisition of new energy vehicles NI.

ATE and Test Systems: Test fixture status acquisition, relay matrix feedback monitoring, power circuit (≤60 V) isolated monitoring, safety interlock signal acquisition. Railway and Ship Control: On-board / Shipboard 24–48 V discrete isolation monitoring, highly reliable I/O in strong interference environments, centralized collection of multi-node status NI.

VII. Installation and Maintenance Instructions

Installation and Power On

Disconnect the card when power is off, and ensure the chassis is reliably grounded; after powering on, NI-DAQmx self-checks, no preheating required for NI.

Operating Temperature: 0–55℃. Keep the air ducts unobstructed and avoid overloading NI due to high temperature.

Wiring and Operation

Avoid frequent plugging and unplugging of the 100-pin interface; it is recommended to use the CB-100 isolation wiring box for intermediate transfer.

Input Voltage: **≤±60 VDC**,严禁 overvoltage； use shielded twisted-pair cables for long distances， keep away from strong electricity / motors.

Filtering Time： Set according to contact characteristics (10–50 ms)， configure change detection to trigger event reporting.

Daily Maintenance

Keep the interface clean， prevent dust accumulation during long-term inactivity； no calibration required， regularly check the tightness of wiring terminals NI.

Optical Isolation is long-term stable， has no mechanical wear， does not require frequent replacement； the isolation layer is subject to regular insulation tests (60 VDC/1 minute).