NI PXI-6528 Digital Input / Output Module

The NI PXI-6528 is a PXI Digital I/O module delivering 24 optically isolated digital input channels and 24 solid-state relay outputs for industrial switching and control applications. Channel-to-channel optical isolation protects low-voltage logic from high-voltage front-end signals across an input range of −60 VDC to +60 VDC. Each input accepts up to 3.0 mA; each SSR output (normally open Form A) handles up to 150 mA. The module connects via 100-pin keyed SCSI connector and integrates into PXI systems through standard PCI Local Bus and PXI hardware architecture.

– Technical Specifications

• 24 optically isolated digital input channels
• 24 solid-state relay output channels (normally open Form A)
• Input voltage range: −60 VDC to +60 VDC
• Maximum input current: 3.0 mA per channel
• Maximum output current (SSR): 150 mA per channel
• Power consumption: +3.3 VDC at 400 mA (typical), +5 VDC at 250 mA (typical)
• Output connector power: +4.0 to +5.25 VDC, 1 A maximum
• Interface: 100-pin keyed female SCSI connector
• Physical dimensions: 6.3 × 3.9 inches

– Key Features

• Entirely software-configurable; no jumper settings required
• Programmable power-up states for safe initialization with industrial actuators
• Software-selectable digital filtering with programmable intervals for debouncing
• Change detection with interrupt capability on user-defined or all input lines
• Watchdog timer enabling failsafe output configuration during system faults
• RTSI bus interface for timing and trigger distribution to compatible devices
• PXI Star Trigger input support

– Typical Applications

High-voltage industrial switching, isolated relay control, process automation, sensor signal isolation, and failsafe control systems requiring optical channel-to-channel separation and watchdog protection.

– Compatibility & Integration

Fully compatible with NI-DAQmx driver software and National Instruments development environments. Adheres to PCI Local Bus and PXI standards for direct integration into PXI chassis systems.