24 V, 8-Channel (Sourcing Output), 100 µs C Series Digital Module. The NI-9472 works with industrial logic levels and signals to connect directly to a wide array of industrial switches, transducers, and devices. Each channel is compatible with signals from 6 V to 30 V, features transient overvoltage protection between the output channels and the backplane, and has an LED that indicates the status.