II. Model Interpretation

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

6527: 652x Isolated DIO series, full-channel opto-isolation + solid-state relay output model

Architecture: 24 independent opto-isolated DI; 24 independent solid-state relay DO, completely isolated between channels

Part Number: 777802-01

Position: High-reliability non-contact switch + preferred choice for strong interference environment monitoring

III. Technical Parameters (25℃)

1. Digital Input (DI)

Channels: 24 independent opto-isolated DI

Voltage range: 3–28 VDC (compatible with 24 V industrial standard)

Logic threshold: High ≥ +11 V, Low ≤ +4 V

Isolation: Channel-to-channel 2500 Vrms (1 minute), Channel-to-ground 2500 Vrms

Input filtering: Hardware fixed + software programmable debounce

Response delay: Typical 150 μs

2. Solid-state Relay Output (DO)

Channels: 24 independent solid-state relay DO (no contacts)

Switch voltage: 0–30 VDC

Switch current: 120 mA/channel continuous

Isolation: Channel-to-channel 2500 Vrms, Channel-to-ground 2500 Vrms

Output capacitance: 55 pF @1 V

Power-on state: Programmable (all off / all on)

Output readback: Supports software reading of output status (diagnostic verification)

3. Physical and Environment

Size: 3U single slot (22×124×126 mm)

Operating temperature: 0–55℃

Power consumption: Approximately 2.0 W

Certifications: UL, CE, Measurement Class II

IV. Interface and Communication Configuration

Front panel interface: 68-pin SCSI female connector (dumb design)

Adapter cable: SH68-68, R6805050 (68-pin adapter)

Terminal box: CB-68, SCB-68A (with isolation terminals)

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

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

Synchronization: PXI trigger bus, multi-module synchronous acquisition and control

V. Core Functions

24DI High Isolation + 24DO Solid-state Non-contact: Single card monitoring of 24 channels of 24 V sensors + driving of 24 small-power DC loads, 2500 Vrms channel-to-channel isolation completely cuts off ground loop current, non-contact solid-state relay lifespan ≥ 1 billion times, far exceeding mechanical relays.

Industrial-grade strong anti-interference: Full-channel opto-isolation + high voltage rating 2500 Vrms, resistant to motor, frequency converter, high-voltage surge interference, suitable for harsh industrial environments.

Output readback diagnosis: Software can read the actual state of the output relay, closed-loop verification of control logic, simplifies system debugging and fault troubleshooting.

Wide voltage input compatibility: 3–28 VDC input range, compatible with global 24 V industrial sensors (NPN/PNP universal).

High-density single slot: 48 channels 3U single slot, saves chassis slots, suitable for large-scale I/O isolation systems.

VI. Application Scenarios

Industrial Automation "High-reliability Monitoring + Non-contact Control": PLC expansion isolation DIO, 24 V sensor acquisition + indicator lights / small relays driving, production line status feedback + non-contact actuator control.

Power and Energy Systems: Switch cabinet status monitoring + small power coil driving, relay protection contact acquisition, high-voltage isolation monitoring circuit. Automotive electronic testing: Binary quantity collection for BCM + Low-power load driving for vehicle lights / door locks, 12/24 V system isolation monitoring.

ATE and test system: Test fixture status collection + Relay matrix control, Power supply circuit isolation on/off, Safety interlock signal closed-loop.

Railway / Ship Control: Isolated monitoring of on-board / shipboard binary quantities + Control of low-power actuators, High-reliability I/O in strong interference environment.

VII. Installation and Maintenance Instructions

Installation and Power On

Disconnect the card and ensure the chassis is reliably grounded; Power on and the NI-DAQmx self-checks, no preheating required.

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

Wiring and Operation

Avoid frequent plugging and unplugging of 68-pin interface; It is recommended to use the CB-68 isolation wiring box for intermediate transfer.

Input Voltage: **≤28 VDC**, Output Current: **≤120 mA/channel**, Do not short circuit; Use shielded twisted pair for long-distance, keep away from strong electricity / motors.

Filtering Time: Set according to contact characteristics (10–50 ms), Watchdog Timeout Time: Set according to safety requirements (100–500 ms).

Daily Maintenance

Keep the interface clean, prevent dust accumulation when idle for a long time; No calibration required, regularly check the tightness of wiring terminals.

Solid-state relays have no mechanical wear, long service life, and do not need frequent replacement; Isolation layer is subject to regular insulation tests (2500 Vrms/1 minute).