The National Instruments PXI-2567 is a 64-channel PXI relay driver module engineered to control relays exceeding standard module voltage and current capabilities. Organized into 8 independent banks of 8 channels each, it can drive 32 two-coil latching relays using dual-channel control. The module supports both internal and external power sources up to 50 V DC, with per-channel drive capability of 600 mA and module-level capacity of 25 A. External power operation eliminates internal supply constraints for demanding test scenarios.
Technical Specifications
Power & Drive Capability
• Maximum drive voltage: 50 V DC (external or internal)
• Maximum drive current per channel: 600 mA
• Maximum drive current per module: 25 A
• Internal 5 V supply: 8 W (0.5 A maximum)
• Internal 12 V supply: 6 W (1.25 A maximum)
• Internal 3.3 V supply: 0.5 W
• User-replaceable fuses: 5 V (F2 A, 125 V) and 12 V (F0.75 A, 125 V)
Protection & Performance
• Overvoltage protection: 80 V maximum
• Over-current protection: 1.5 A minimum threshold
• Over-temperature protection: 150 °C junction temperature
• Flyback protection per channel
• Single-channel operate time: 60 µs typical at 25 °C
• Channel on-resistance (RDSon): 0.280 Ω maximum across 0–600 mA drive range
• Channel off leakage current: 50 µA typical (13 V) to 200 µA typical (25 V)
Trigger Interface
• Input sources: PXI trigger lines 0–7, front panel
• Input minimum pulse width: 150 ns (150 ns recognition without digital filtering)
• Input voltage levels: –0.5 V to +5.5 V, with logic thresholds at +0.7 V (max low) and +2.0 V (min high)
• Output pulse width: Software-selectable 1 µs to 62 µs
• Output voltage (front panel): 3.3 V TTL, 8 mA nominal
Physical & Interface
• Form factor: 3-slot PXI
• Dimensions: 21.6 × 2.0 × 13.0 cm
• Connector: 78-pin D-SUB
– Key Features
• 64 independent relay driver channels in 8-bank configuration
• Dual power sourcing: internal regulated supplies or external 50 V DC
• High channel density with 0.280 Ω on-resistance minimizes voltage drop
• Per-channel protection against overvoltage (80 V), over-current (1.5 A), and over-temperature (150 °C)
• Low leakage current enables precision switching in high-impedance circuits
• Fast operate time of 60 µs supports high-speed relay sequencing
• PXI trigger integration with software-configurable output pulse widths
– Typical Applications
• Automated relay control for high-current test circuits
• Multi-channel signal routing in production test systems
• Power switching in thermal chamber and environmental chamber interfaces
• Latching relay sequencing in complex test sequences
– Compatibility & Integration
Part Number: 778572-67. Driven by NI-SWITCH software across LabVIEW, LabWindows/CVI, C/C++, Python, and .NET development environments.
