The National Instruments PXI-6521 is a 16-channel, isolated digital I/O module for PXI Express systems. It provides 8 sink/source inputs and 8 relay outputs, making it ideal for a variety of applications, including:

• Data acquisition
• Industrial automation
• Test and measurement
• Machine control

The PXI-6521 features a high-speed backplane interface that supports data transfer rates up to 80 MB/s. It also has a built-in isolation barrier that protects the module from ground loops and other electrical noise.

Here are some of the key features of the National Instruments PXI-6521:

• 16 channels of digital I/O
• 8 sink/source inputs
• 8 relay outputs
• High-speed backplane interface (80 MB/s)
• Built-in isolation barrier
• Support for multiple programming languages, including C++, Visual Basic, and LabVIEW

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