8-Slot, Virtex-5 LX85 FPGA, MXI-Express CompactRIO Chassis—The NI‑9155 is a rugged MXI‑Express chassis for high-performance, high‑channel‑count applications. With the NI‑9155, you can add C Series I/O modules to your PXI system or industrial PC. You can daisy chain up to six NI‑9155 chassis in a single chain and connect up to eight chains to a single controller.