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NI PXI-6521

150 V Mechanical Relay Outputs, 30 V Digital Inputs

  • 2 A switching current, 60 W switching power
  • 24 V logic, sinking or sourcing inputs
  • 8 nonlatching mechanical relay outputs, 150 VAC/VDC
  • Prog. power-up states and input filters, watchdog timers, change detection
  • NI measurement services software with configuration utility for easy setup
  • Channel-to-channel isolation: 60 V continuous, 620 Vrms withstand for 5 seconds
  • Data Sheet  |   Configure System popup

View Diagram

Select one of the following options for product configuration and pricing:

Select Module and Accessories Below »   Configure and Price a Complete PXI System »
 
Module Accessories   Chassis, Controllers, Modules Software & Services
Step 1: Verify Device and Quantity Selection
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
779313-01 NI PXI-6521 -- For price, select country  

Each NI PXI-6521 requires: 1 Cable, 1 Connector Block

NI PXI-6521 Cable Connector Block
Step 2: Select Cable
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
Shielded
778621-02 SH37F-37M Cable (2m)
NI Recommended
-- For price, select country  
778621-01 SH37F-37M Cable (1m) -- For price, select country  
Step 3: Select Connector Block
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
Screw Terminals
779491-01 CB-37F-HVD - Unshielded
NI Recommended
-- For price, select country  
779444-01 TB-2621 - Unshielded -- For price, select country  
779185-01 TB-37F-37CP - 37-Pin Crimp and Poke Terminals, shell w/strain relief, No Cable Required -- For price, select country  
778673-01 CB-37FH - Unshielded,Horizontal DIN Rail Mount -- For price, select country  
778672-01 CB-37FV - Unshielded,Vertical DIN Rail Mount -- For price, select country  
779353-01 CB-37F-LP - Unshielded -- For price, select country  
779184-01 TB-37F-37SC - 37-Pin Solder Cup Terminals, shell w/strain relief, No Cable Required -- For price, select country  
Step 4: Select Optional Accessories
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
Other
779445-01 37-Pin High-Voltage Accessory Safety Kit -- For price, select country  
Step 5: Add to Cart or Get a Quote

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

The National Instruments PXI-6521 is an industrial digital I/O module with eight 150 VAC/VDC relay outputs with maximum switching power of 60 W, and eight ±30 VDC digital inputs with 60 V channel-to-channel isolation and industry-standard 24 V logic levels. The digital inputs offer connectivity to both sinking and sourcing signals. The NI PXI-6521 is a UL listed device with 60 V continuous and 620 Vrms withstand (5 s) isolation. For added safety the PXI-6521 requires a keyed connector. For added reliability, the module features watchdog timers to recover from a variety of computer and application faults. It also features programmable power-up states, digital filtering, and change detection for optimal control over your application. The PXI-6521 offers a keyed 37-pin D-Sub connector for connectivity to NI low-cost high-voltage accessories. PXI-6521 takes advantage of NI-DAQmx driver software, which helps you achieve shorter setup times and increased productivity.

Specifications Documents


Specifications Summary

General 
Form FactorPXI
OS SupportWindows, Real-Time, Linux
Measurement TypeDigital
Isolation TypeCh-Ch Isolation
Analog Input 
Number of Channels0
Analog Output 
Number of Channels0
Digital I/O 
Number of Channels8 DI/8 DO
TimingSoftware
Logic Levels24 V
Maximum Input Range-30..30 V
Maximum Output Range0..150 V
Input Current FlowSinking, Sourcing
Programmable Input FiltersYes
Output Current FlowRelay, Form A, Relay, Form C
Current Drive (Channel/Total)2 A/16 A
Watchdog TimerYes
Supports Programmable Power-Up States?Yes
Supports Handshaking I/O?No
Supports Pattern I/O?No
Counter/Timers 
Number of Counter/Timers0
Timing/Triggering/Synchronization 
Synchronization Bus (RTSI)No
Physical Specifications 
Length16 cm
Width10 cm
I/O Connector37-pin D-Sub

Factory Installation

Reduce your setup time with National Instruments installation services and get a system you can use out of the box. Factory installation services include:

  • Installation of all individual hardware and software components as well as full testing to eliminate conflicts
  • Custom documentation plus a custom restore and startup utility
  • 2-year warranty and calibration coverage

This service is only available for PXI, CompactRIO, and Compact FieldPoint systems.

Extended Warranties

National Instruments designs and manufactures all products to minimize failures, but we know unexpected failures can still occur. Extended warranties provide a fixed economical price at the time of system purchase covering any repair costs for up to three years.

  • Significant cost savings compared to individual repair incidents
  • Fault location, diagnostics, and repair by NI any time the system product fails
  • All parts and labor costs covered as well as any adjustments needed to bring the hardware back to manufacturing specifications

Calibration

NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. We provide manual calibration procedures, services to recalibrate your products, and automated calibration software to calibrate many of our measurement products.

Training

NI training is the fastest, most certain route to productivity with NI tools and successful application development.

Repair Services

  • You can return your registered product under warranty at no additional labor and parts cost. NI offers fault location, diagnostics, and repair any time the system fails as well as any adjustments needed to bring the hardware back to manufacturing specifications.
  • Contact us to obtain a Return Material Authorization (RMA) form and shipping instructions
  • View your RMA support request status online
  • Register your product

Technical Support

www.ni.com/support

Select your application need to see compatible software options for the NI PXI-6521.

Application Need

Graphical Programming Text-Based Programming
Select any of the following software products
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
776670-09 NI LabVIEW Full Development System for Windows (English)
NI Recommended
-- For price, select country  
777756-09 NI LabVIEW Full Development System for Linux -- For price, select country  
776675-01 LabVIEW Application Builder for Windows (English)
NI Recommended
-- For price, select country  
777755-03 NI LabVIEW Application Builder for Linux -- For price, select country  
778406-03 NI LabVIEW Report Generation Toolkit for Microsoft Office -- For price, select country  
778807-09 DIAdem Advanced Edition (English) -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Select any of the following software products
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
776800-09 LabWindows/CVI Full Development System for Windows -- For price, select country  
778801-09 NI Measurement Studio Professional Edition for Microsoft Visual Studio -- For price, select country  
779384-03 NI LabWindows/CVI Run-Time Module for Linux -- For price, select country  
777875-03 NI LabWindows/CVI Enterprise Connectivity Toolkit for Windows -- For price, select country  
778807-09 DIAdem Advanced Edition (English) -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Other compatible software: ANSI C/C++, C#, Visual Basic .NET, Visual Basic 6.0
Graphical Programming Text-Based Programming
Option 1: Select one of the following NI Developer Suite packages or Configure Your NI Developer Suite >>
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
DS410841 NI Developer Suite Core with Automated Test Option (English) -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Option 2: Select any of the following software products
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
776670-09 NI LabVIEW Full Development System for Windows (English)
NI Recommended
-- For price, select country  
777756-09 NI LabVIEW Full Development System for Linux -- For price, select country  
776675-01 LabVIEW Application Builder for Windows (English)
NI Recommended
-- For price, select country  
777755-03 NI LabVIEW Application Builder for Linux -- For price, select country  
777777-09 NI TestStand Development System for Windows -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Option 1: Select one of the following NI Developer Suite packages or Configure Your NI Developer Suite >>
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
DS410841 NI Developer Suite Core with Automated Test Option (English) -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Option 2: Select any of the following software products
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
776800-09 LabWindows/CVI Full Development System for Windows -- For price, select country  
778801-09 NI Measurement Studio Professional Edition for Microsoft Visual Studio -- For price, select country  
779384-03 NI LabWindows/CVI Run-Time Module for Linux -- For price, select country  
777875-03 NI LabWindows/CVI Enterprise Connectivity Toolkit for Windows -- For price, select country  
777777-09 NI TestStand Development System for Windows -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Other compatible software: ANSI C/C++, C#, Visual Basic .NET, Visual Basic 6.0
Graphical Programming Text-Based Programming
Option 1: Select one of the following NI Developer Suite packages or Configure Your NI Developer Suite >>
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
DS410863 NI Developer Suite Core with Control Design and Simulation Option (English) -- For price, select country  

Please select the country where you will use the product(s) so that we can provide you with accurate pricing, availability, and purchasing information

Option 2: Select any of the following software products
Part
Number
Description Est Ship Days Glossary Definition US Dollars
(change)
Qty
776670-09 NI LabVIEW Full Development System for Windows (English)
NI Recommended
-- For price, select country  
777756-09 NI LabVIEW Full Development System for Linux -- For price, select country  
780050-09 NI LabVIEW Control Design and Simulation Module -- For price, select country  
778941-03 NI LabVIEW System Identification Toolkit for Windows -- For price, select country  
778552-03 NI LabVIEW Simulation Interface Toolkit for Windows -- For price, select country