II. Model Interpretation

PXI: Compliant with the PXI industrial bus standard, can be used in PXIe mixed slots.

2569: The model code of the NI universal relay module series, representing a 100-channel SPST normally open electromechanical relay NI.

Full name: PXI-2569 100-Channel SPST PXI Relay Module NI.

Topology identifier: NISWITCH_TOPOLOGY_2569_100_SPST, the hardware topology is fixed and cannot be reconfigured by software NI.

III. Technical Parameters

(1) Switching and Electrical Characteristics

Topology: 100 independent SPST (Form A) normally open, each channel includes CH (signal terminal) and COM (common terminal); it can also be configured as 50 DPST NI.

Relay type: Electromechanical non-latching relay, gold-plated contacts NI.

Maximum switching voltage: 100 VDC / 100 Vrms (CAT I), peak 150 VNI.

Single-channel maximum switching/carrying current: 1 ANI.

Maximum switching power: DC 60 W, AC 125 VA.

On-resistance: Typical value < 100 mΩ.

Working bandwidth: DC ~ 20 MHz.

Action time: Typical 1 ms, maximum 2 ms.

Insulation withstand voltage: Channel-to-channel, channel-to-ground 150 Vrms; pulse withstand voltage 800 VNI.

(2) Life and Scan Parameters

Mechanical life: 2×10⁷ times on-off.

Full-load electrical life: 1×10⁵ times on-off.

Scan list: Maximum 32,000 steps programmable scan sequence NI.

Full-channel scan rate: Maximum 145 times/second NI.

(3) Trigger and Control

Trigger channels: Support hardware trigger bus from PXI backplane Trigger 0 to Trigger 7.

Minimum trigger pulse width: 150 ns.

Built-in functions: Each relay channel has an independent counter for life monitoring.

(4) Physical and Environmental Parameters

Form specification: Standard 3U PXI single-slot module NI.

Front-end connector: 200-pin D-SUB female connector NI.

Form size: 216 mm × 20 mm × 130 mm NI.

Weight: Approximately 0.45 kg NI.

Power supply: 5 V power supply from PXI backplane, typical power consumption 6.0 W NI.

Operating temperature: 0 ℃ ~ 55 ℃ NI.

Storage temperature: -20 ℃ ~ 70 ℃ NI.

Relative humidity: 5% ~ 85%, no condensation NI.

IV. Interface and Communication Configuration

Front-end I/O Interface

All external signals are led out through 200-pin D-SUB male connector, including 100 SPST channels (CH/COM), and the remaining pins are shielding ground and reference ground. Electrical isolation between channels, failure of a single channel does not affect other channels NI.

Bus and Software Communication

Bus interface: Standard PXI backplane bus, automatically acquires power, clock, and trigger signals, compatible with PXIe chassis mixed slots.

Driver: Standard NI- SWITCH driver, compliant with IVI specification NI.

Software support: Compatible with LabVIEW, TestStand, LabWindows/CVI, Python, etc. NI.

Basic functions: NI MAX can complete hardware identification, channel status reading, scan editing, trigger configuration, and on-off count query NI. Synchronization capability: Utilizing the PXI trigger bus, it enables high-precision synchronous switching of multiple modules and instruments.

V. Core Functions

Ultra-high channel density: 100 SPST channels in a single 3U slot, saving slots and suitable for large-scale multi-channel signal switching by NI.

Medium-power signal switching: Rated at 1 A/100 V, supporting medium-power loads, compatible with relays, solenoid valves, etc. control circuits by NI.

High-speed programmable scanning: 32,000-step scanning list, executed by hardware automatically, enhancing test efficiency by NI.

Hardware synchronization trigger: PXI backplane trigger, precise timing synchronization of multiple modules when switching, meeting requirements for high-speed parallel testing.

Relay life monitoring: On-board counter records the number of on/off cycles in real time, supporting predictive maintenance.

Wide frequency adaptation: DC to 20 MHz bandwidth, compatible with DC, industrial frequency, and low-frequency AC signals.

VI. Application Scenarios

Semiconductor / electronic component automated testing, achieving multi-pin signal selection by NI.

Automotive electronic testing, vehicle wiring, and on-board low-voltage circuit continuity detection by NI.

Industrial data acquisition system, multi-measurement point sensor signal multiplexing by NI.

Industrial ATE equipment, multi-channel control signals, and medium-power load programmable switching by NI.

Laboratory research and development platform, multi-channel signal routing, loop switching, and comparative testing by NI.

Large-scale distributed measurement and control system, high-density switch array, unified scheduling of multiple test signals by NI.

VII. Usage and Maintenance Instructions

Usage Points

Installation: Insert into a 3U standard slot, lock the panel screws, keep away from strong vibration and strong electromagnetic interference by NI.

Connection: Use matching 200-pin D-SUB cables, gently plug and unplug; use shielded cables for precise signals and reliably ground them by NI.

Electrical Limits: Strictly follow the 100 V/1 A rated parameters, prohibit overpressure and overcurrent; external series diodes for inductive loads by NI.

Trigger Mode: Software trigger for debugging; PXI hardware trigger for multi-module synchronization / high-speed scanning.

Power-on Specifications: Connect cables first, then power on; disconnect signal cables after power off, and prohibit plugging and unplugging while powered on by NI.

Maintenance Instructions

Regular Inspection: Check D-SUB connectors quarterly, clean dust, and troubleshoot loose or oxidized connections by NI.

Life Management: Regularly read the number of on/off cycles, replace before the load reaches 1×10⁵ times.

Environmental Control: Maintain dry and ventilated conditions, temperature 0~55 ℃, avoid condensation and dust accumulation by NI.

Fault Handling: Check wiring and grounding first for abnormal channels; relays cannot be replaced on-site, hardware faults require overall replacement or return to the factory by NI.

Storage Requirements: Disconnect cables when not in use, protect interfaces from dust, store in a dry environment at -20~70 ℃, away from high temperatures, corrosion, and strong magnetic fields by NI.

Calibration: Conduct functional verification once a year, test on-off status, conduction resistance, and other indicators by .