The National Instruments PCI-6511 (Part Number: 778966-01) is a robust digital input/output device designed for critical industrial applications, featuring integrated watchdog functionality for increased reliability. This device is specially configured to monitor the state of connected actuators such as pumps, valves, and motors. In the event of an identified fault, the advanced output channels transition to a user-defined safe state, ensuring system protection against unforeseen errors. The device remains in this watchdog state until it is reset or the application writes new I/O values.

Equipped with 64 source/sink input lines, the PCI-6511 supports a maximum input voltage of ±30 VDC and a maximum input current of 12.5 mA per line. The device utilizes programmable data channels and change detection features to minimize the effects of noise on input lines, enabling reliable detection of digital state transitions. When a change is detected—either a rising or falling edge on one or more digital lines—the NI PCI-6511 triggers the application to perform a corresponding read operation via the NI-DAQmx software, independent of other data acquisition activities.

This advanced digital I/O device connects through a 100-pin keyed female SCSI connector and operates on a power requirement of +5 and +3.3 VDC with a total consumption of 250-300 mA. With a compact form factor measuring 5.94 in × 4.75 in and weighing only 3.1 oz, the PCI-6511 is designed for easy integration into various industrial systems. The product includes a warranty of 2-3 years, and user manuals are available for download, ensuring complete support for installation and maintenance. For pricing and further information, please contact a sales representative.