The National Instruments PCI-6521 is a high-performance digital I/O module designed for industrial automation applications. With a part number of 779312-01, this device features a robust channel configuration, offering eight source/sink input lines and eight electromechanical relay output lines capable of handling up to 150 Vac/Vcc. The maximum input voltage is rated at ±30 VDC, with a maximum input current of 12.5 mA per line, ensuring versatile connectivity and control. It incorporates advanced safety features such as computerized I/O watchdogs, which activate customizable safe output states in case of errors, thus facilitating a secure recovery from fault conditions. The module is equipped with programmable power states, digital filtering, and change detection, providing comprehensive control for various applications. The PCI-6521 operates reliably within Windows environments, even during critical software interruptions.

The device is UL-certified, reflecting its compliance with established safety standards to guarantee secure operation. A keyed 37-pin male D-SUB connector prevents accidental connections between high and low voltage devices, while protective covers on both sides enhance user safety. The PCI-6521 operates with a +5 VDC power requirement at 600 mA and measures 6.9 inches by 3.9 inches, weighing 0.37 pounds. It is compatible with NI-DAQ 7.5 and NI-DAQmx driver software, making it a suitable choice for engineers seeking reliable and dependable digital I/O solutions. For additional information, user manuals are available for download, and interested parties can contact a sales representative for pricing details.