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PXI-6521
PXI-6521, 16-Channel, PXI Digital I/O Module
Actual item may vary if no part number is provided on quote request.
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March 2025
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January 2025
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" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
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January 2025
National Instruments PXI-6521 PXI Digital I/O Module
The National Instruments PXI-6521 (Part Number: 779313-01) is a ±30 VDC, 16-Channel, 8 Relay Outputs, 8 Sink/Source Input, Isolated PXI Digital I/O Module. This module offers industry-standard 24 V logic levels and high channel isolation. For added safety, the PXI 6521 provides a keyed connector. The PXI-6521 is a measurement category II device; thus, it is designed to carry signal voltages ≤ 150 V. However, it can withstand up to 1,500 V surge voltage.
The NI PXI-6521 utilizes positive voltage. A high digital signal energizes the relay, whereas a low digital signal de-energizes it. While in the energized state, the COM contact remains lined up to the normally open (NO) contact. In the de-energized state for Form C relays, the common contact remains lined up to the normally closed (NC) contact. The default power-up states for both the Form C and Form A relays are de-energized, which makes contact open at NO and COM. For ensuring power-up in a predefined, known state, this model offers user-configurable power-up states. Users can have the power-up states configured using NI-DAQ with LabVIEW.
This digital I/O module can monitor changes on all input lines or selected input lines. The user can also program this device to send an interrupt against a change occurring on an input line. As far as the contact rating is concerned, this module offers 60 W/60 VA maximum switching power and 150 VAC maximum voltage. The National Instruments PXI 6521 consumes 100 mA max power while operating at 3.3 V (±5%) and 300 mA at 5 V.
| Model | PXI-6521 |
|---|---|
| Manufacturer | National Instruments |
| Part Number | 779313-01, 192320B-01 |
| Type | PXI Digital I/O Module |
| Digital Input Channels | 8 |
| Digital Output Channels | 8 |
| Digital I/O Logic Levels | 24V |
| Dimensions | 6.3 x 3.9 in. |
| Weight | 5.0 oz. |
| PXI-6521 Manual | User Manual and Maintenance Manual Available for Download |
| Price | Request a quote |
Associated part numbers for PXI-6521:
National Instruments PXI-6521 Frequently Asked Questions
Question: What is the output voltage range of the PXI 6521?
Answer: The PXI 6521 has an output voltage range of 0 V to 150 V.
Question: What is the single-ended digital I/O channel current drive of the NI PXI-6521?
Answer: The NI PXI-6521 has a single-ended digital I/O channel current drive of 2 A.
Question: What is the maximum switching power of the PXI-6521?
Answer: The maximum switching power of the PXI-6521 is 60 W/60 VA.
Question: What type of I/O connector is on the PXI-6521?
Answer: There is a 37-pin keyed male D-SUB I/O connector on the PXI-6521.
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