±5 V to 24 V, 6 Differential/Single-Ended Channels, 500 ns C Series Digital Module. The NI-9411 works with industrial logic levels and signals for direct connection to a wide array of industrial switches, transducers, and devices. The NI-9411 is a correlated digital module, so it can perform correlated measuerements, triggering, and synchronization when installed in a CompactDAQ chassis.