The National Instruments part number 778572-68 refers to the PXI-2568 SPST Relay Module, an advanced device designed for precise control in automation systems. It features 31 electromechanical, latching Single-Pole Single-Throw (SPST) relays, which allow for versatile connectivity from a single input to a single output based on control signals. The module utilizes a Form A latching design, meaning the switches default to a Normally Open state when inactive. In addition, it incorporates 15 Double-Pole Single-Throw (DPST) switches that can simultaneously control two circuits, with both poles operating in unison—when actuated, they open or close their respective circuits together.

This relay module supports a maximum switching voltage of 150 Volts between channels and between a channel and ground, ensuring a Category I safety rating, which indicates suitability for measurements on circuits not directly connected to mains power. The switching power capacity is rated at 60 watts or 62.5 VA, while the current-handling capability stands at a maximum of 2 Amperes per channel. Exceeding this current rating may lead to irreversible damage. The relays are capable of state changes in as little as 1 ms but may extend to a maximum of 3.4 ms, with a maximum switching speed of approximately 145 cycles per second, allowing for efficient operation in dynamic applications. The mechanical life of the relays is rated at 1 x 10^8 cycles, while the electrical life at a switching voltage of 10 Volts is 2.5 x 10^6 cycles.

Control of the relay switching is facilitated via 7 memory-addressable trigger lines, requiring a pulse width of 150 ns for activation or deactivation. The module operates with a power requirement of 6 Watts at 5 Volts or 2.5 Watts at 3.3 Volts. The dimensions of the PXI-2568 module are 21.6 cm x 2.0 cm x 13.0 cm (8.5 in. x 0.8 in. x 5.1 in.), with a lightweight design weighing approximately 227 g (8 oz), making it suitable for a wide range of industrial and laboratory applications.