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National Instruments USB-6525 Isolated digital I/O device with solid-state relay outputs
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National Instruments · Computer-based USB data acquisition

USB-6525

The NI USB-6525 is a bus-powered USB digital I/O device with eight isolated inputs and eight solid-state relay outputs. It supports industrial digital sensor monitoring and actuator switching within its specified electrical limits.

ManufacturerNational Instruments
ModelUSB-6525
Part Number779640-01
Product TypeIsolated digital I/O device with solid-state relay outputs
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Digital inputs8 channel-to-channel isolated inputs
Digital outputs8 isolated solid-state relays
Input range-60 to +60 VDC
Relay switching limits60 VDC or 30 Vrms; 500 mA maximum per channel
ConnectionUSB 2.0; screw-terminal signal connections
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Overview

Product overview

Key product information and technical features.

The USB-6525 combines isolated digital sensing and relay switching in a computer-connected device. Its bus-powered design supports industrial sensor and actuator interfaces without a modular DAQ chassis.

Signal wiring connects directly to screw terminals. The outputs switch an external load circuit rather than supply a programmable output voltage; load power and wiring must follow the NI connection instructions.

  • Separate banks of eight isolated digital inputs and eight isolated relay outputs.
  • Programmable input filtering and change detection.
  • Configurable power-up output states and a watchdog timer.
  • P1.7/PFI 0 can serve as the input to a 32-bit event counter.
Verified specifications

Technical data

Verified product specifications.

Digital input channels8, channel-to-channel isolated
Digital input voltage range-60 to +60 VDC
Output channels and relay type8, channel-to-channel isolated, normally open SSR
Maximum relay switching voltage60 VDC / 30 Vrms
Maximum switching current per channel500 mA
Relay switching rate at 90% duty cycle5 operations/s
Event counter1 shared with P1.7/PFI 0; 32-bit; 5 kHz maximum input frequency
Bus interfaceUSB 2.0 full-speed, 12 Mb/s
Signal connectorsTwo 16-position screw-terminal plug headers
Operating temperature0 to 55 °C
Condition & included items

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Condition

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Included

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Compatibility

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National Instruments

Manufacturer

USB 2.0

Computer interface

USB-6525

Isolated digital sensing and relay switching

Field connections

Direct screw-terminal wiring; no separate signal-interface accessory required.

Use external load power within relay ratings and follow NI guidance for inductive-load protection.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI USB-6525 Product PageProduct Page · ni.com
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NI USB-6525 User Guide and SpecificationsUser Guide And Specifications · docs-be.ni.com
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USB-6525 Dimensional DrawingsDimensional Drawings · ni.com
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NI 650x/651x/652x Cable and Accessory Compatibility GuideTechnical resource
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Shipping, warranty & returns

Commercial terms

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Shipping
Free Shipping. Full policy terms apply.
Warranty
30-Day Warranty. Standard coverage applies.
Returns
30-Day Returns. Return policy applies.
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does the USB-6525 supply 60 V to a load?

No. The 60 VDC rating is a relay switching limit, not a generated voltage. The load circuit uses an external power source.

Does it require a separate terminal-block accessory?

Signals connect directly to the device's screw-terminal connections; a separate signal-interface accessory is not required.

Can it count external events?

Yes. P1.7/PFI 0 can be configured for a 32-bit rising-edge event counter, with a maximum input frequency of 5 kHz.

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