B&R Industrial Automation · System Modules For X20 Redundancy Systems. Active hub expansion module 2x Fast Ethernet hub for redundant wiring Hot-swap-capable The X20BC8084 POWERLINK bus controller and the X20HB8884 module are equipped with an integrated link selector function. An additional 1 or 2 slots are available, depending on the bus base used. The active X20HB2885 hub expansion module can be operated in these slots. The active hub expansion module is equipped w
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