2-Channel, 11 A, C Series Busbar Module—The NI‑9997 allows you to route external excitation to both modules and sensors, and it offers channel‑to‑channel, CAT II isolation. You can use the NI‑9997 to protect your system from dust and debris in industrial settings while adding functionality and routing sensor excitation. The NI‑9997 does not provide an external connection to the chassis backplane.