Model Explanation

PXI: PXI Bus Standard (PCI eXtensions for Instrumentation)

2565: NI Switch Module Serial Number, defined as 16-channel SPST, 7 A, 250 VAC high-power relay module

Full Name: PXI-2565 / 777754-01 → 16-Channel, 7 A, SPST PXI Relay Module

Topology Alias: NISWITCH_TOPOLOGY_2565_16_SPST (Fixed 16×SPST, cannot be reconfigured via software) NI Technical Specifications

Switch and Electrical Characteristics

Topology: 16 independent SPST (Form A, normally open), not configurable as DPSTNI

Relay Type: Electromechanical, non-latching, field-replaceable socket-type relay

Maximum Switching Voltage: 125 VDC / 250 VAC (CAT II measurement class)

Maximum Switching / Load Current: 7 A (250 VAC); 5 A (125 VDC)

Maximum Switching Power: 1750 VA (AC); 625 W (DC)

On-State Resistance (Typical): <100 mΩ

Bandwidth: DC～10 MHz

Action Time (Typical): <15 ms

Relay Lifespan:

Mechanical Life: 1×10⁷ times

Full Load Electrical Life: 1×10⁵ times (7 A / 250 VAC)

Isolation Voltage: 1400 Vrms between backplane and channel

Trigger and Control

Trigger Line: Supports PXI Trigger 0～7

Scan List: Maximum 1024 steps, supports deterministic scanning

Scan Rate: Up to 5 times/second (full channel)

Physical and Environmental

Form: Standard PXI 3U single slot

Connectors: Front panel 32-pin Mini Combicon (male), screw terminals

Dimensions (Length × Width × Height): Approximately 216×20×130 mm

Weight: Approximately 0.32 kg

Operating Temperature: 0～55°C

Storage Temperature: -20～70°C

Power Consumption (5 V): Approximately 5.5 W

Interface and Communication Configuration

Front Panel I/O

32-pin Mini Combicon (male):

16 SPST: Each channel has 1 CH (signal terminal) and 1 COM (common terminal)

Pin Assignment: CH0～CH15, COM0～COM15, a total of 32 pins (NI) 

Backplane and Driver

Bus Interface: PXI Hybrid Slot (compatible with PXI-1/PXIe)

Power Supply: 5V power supply from PXI backplane

Driver Software: NI-SWITCH (IVI compatible), supports LabVIEW, TestStand, CVI, Python

Software Features: MAX identification, relay count, trigger management, scan list configuration

Core Functions

16 Independent High-Power SPST Switches: Each channel can be independently turned on or off, compatible with AC line voltage and DC power supply

High Voltage / High Current Capacity: 7 A / 250 VAC or 5 A / 125 VDC, covering most power testing requirements

On-site Replaceable Relays: Socket design, no need for factory return, reducing maintenance costs

Hardware Trigger + Deterministic Scanning: PXI backplane trigger synchronization, 1024-step scan list, improving test throughput

Relay Health Monitoring: On-board closing count, supporting predictive maintenance

High Isolation Voltage: 1400 Vrms between backplane and channel, ensuring system safety Applicable scenarios

Automotive electronic testing: ECU power circuit, load box, battery simulation, high-voltage wiring test

Industrial ATE: Power / load switching in mass production testing, relay module aging test, motor control

Energy and power: Photovoltaic module test, battery charge and discharge test, power distribution control

Military / Aviation: High-power power routing, electromagnetic coil control, onboard equipment power switching

General high-power switch: Replace mechanical switch to achieve automated programmed AC/DC power switching

User and maintenance instructions

Installation and configuration

Insert the PXI 3U single slot and fix it.

Install the NI-SWITCH driver, identify the module in MAX (topology fixed as 16-SPSST) NI.

Connect the 32-pin Mini Combicon cable. For high-power circuits, it is recommended to use multi-strand shielded wire and reliably ground.

Operation points

Power limit: Strictly follow the limits of 7 A / 250 VAC and 5 A / 125 VDC; for inductive loads (motors, coils), a rectifier diode or surge suppressor must be added to avoid overvoltage damage to contacts NI.

Trigger selection:

Low-speed debugging: Software immediate trigger;

High-speed synchronization: PXI hardware trigger (0-7 lines).

Channel independent control: 16 channels can be independently turned on and off, without interference.

Maintenance and calibration

Life monitoring: Read the number of closures through NI-SWITCH, warning for replacement when approaching 1×10⁵ times (full load).

Regular inspection: Check the Mini Combicon connector for looseness and oxidation every quarter; clean the contacts.

Environmental requirements: Working temperature 0-55°C, humidity 10%-90% (no condensation).

Relay replacement: Use the NI relay replacement kit, plug and unplug for on-site replacement, no welding required.