The National Instruments PCI-6521 is an industrial digital I/O board with eight 150 VAC/VDC relay outputs with maximum switching power of 60 W, and eight ±30 VDC digital inputs with 60 V channel-to-channel isolation and industry-standard 24 V logic levels. The digital inputs accept both sinking and sourcing signals. The NI PCI-6521 is a UL listed device with 60 V continuous and 620 Vrms withstand (5 seconds) channel-to-channel isolation. For added safety the PCI-6521 provides insulated covers on both sides of the board and requires a keyed connector. For added reliability, the PCI-6521 features watchdog timers to recover from a variety of computer and application faults. It also features programmable power-up states, digital filtering, and change detection for optimal control over your application. The PCI-6521 offers a keyed 37-pin D-Sub connector for connecting to NI low-cost high-voltage accessories. PCI-6521 takes advantage of NI-DAQmx driver software, which helps you achieve shorter setup times and increased productivity.
