The NI PXI-6527 is a 48-bit parallel digital I/O module for PXI systems, featuring 24 optically isolated inputs and 24 solid-state relay outputs. It delivers galvanic isolation up to 60 VDC between the computer and all channels, making it ideal for industrial control applications where noise immunity and ground-loop prevention are critical. The module interfaces via a 100-pin connector and operates within 0 to 50 °C, consuming 500 mA maximum at +5 VDC.
Technical Specifications
Digital Inputs
• 24 channels, optically isolated
• Input voltage range: 0 to 28 VDC
• Logic high threshold: 2 to 28 VDC
• Logic low threshold: 0 to 1 V
• Isolation: 60 VDC (channel-to-channel and computer)
• Maximum input current: 1.5 mA at 5 V; 8 mA at 24 V
• Digital filtering available to suppress transient glitches
• Edge-triggered change notification on user-selected lines
Digital Outputs
• 24 channels, solid-state relay type
• Output voltage range: 0 to 60 VDC, 0 to 30 Vrms
• Maximum switch current: 120 mA
• Isolation: 60 VDC or 30 Vrms (channel-to-channel and computer)
• Overcurrent limiting: ~260 mA typical
• Configurable power-up state (default open/high)
• TTL and non-TTL switching capability
Physical and Environmental
• Total I/O: 48-bit (24 input, 24 output)
• Connector: 100-pin female
• Dimensions: 6.3 x 3.9 inches
• Operating temperature: 0 to 50 °C
• Storage temperature: -20 to 70 °C
• Power requirement: 500 mA maximum at +5 VDC
– Key Features
• Channel-to-channel isolation mitigates noise and ground loops
• Optical isolation on all inputs eliminates common-mode coupling
• Solid-state relay outputs rated to 120 mA with integrated overcurrent protection
• Wide input sensing range accommodates 5 V and 24 V logic standards
• Programmable edge detection enables event-driven I/O handling
• Software-configurable output power-up states for safe initialization
– Typical Applications
• Industrial equipment control and monitoring
• High-noise manufacturing environments
• Multi-voltage system integration
• Safety-critical digital switching
• Data acquisition from isolated sensor networks
– Compatibility & Integration
Supported under Windows 2000/NT/XP with NI-DAQ 7 driver software. LabVIEW provides real-time performance capabilities. Compatible with LabWindows/CVI and Measurement Studio development environments.
