National Instruments 776336-12

The National Instruments part number 776336-12 corresponds to the SC-2062 Electromechanical Relay, featuring eight channels and single-pole, double-throw (SPDT) relay configurations. This relay board includes one 26-pin male ribbon-cable connector along with 26 screw terminals, allowing for versatile interfacing. It is designed for either bench-top or rack-mount installation, accommodating optional flat plastic or metal wraparound covers. The NI 776336-12 interfaces seamlessly with any 8-bit digital port from various National Instruments Data Acquisition (DAQ) devices in the E Series/60xxE, 6503 (DIO-24), 6533 (DIO-32HS), and 6508 (DIO-96) families using appropriate SC-205x Series cable adapters. Notably, this relay does not require additional software beyond what is necessary for the accompanying data acquisition board. Each of the eight SPDT relays is triggered by a digital output line, where the normally closed (NC) contact is engaged when the output line is low, and the normally open (NO) contact engages when the output line is high. This design guarantees break-before-make operation, preventing simultaneous contact closures. The relay board features isolation up to 250 Vrms between the contacts and coil, as well as between contacts themselves, promoting safe operation. Designed to handle various field digital signals, the 776336-12 is compatible with National Instruments data acquisition boards connected to Macintosh II, IBM PS/2 Micro Channel, and PC/XT/AT systems. Users should exercise caution when connecting or disconnecting signal lines at the screw terminals to avoid shock hazards, particularly due to potential differences between signals and ground. The relay utilizes gold-plated silver nickel contacts, ensuring reliability and maintaining an initial contact resistance of no more than 100 mΩ.