B&R Industrial Automation · System Modules For The X20 Hub System. Hub expansion module 1x hub 100 BASE-FX Fiber optic multimode cable Range up to 2 km Hot-swap-capable POWERLINK bus controllers X20BC8083 and X20BC8084 (starting with revision D0) and standalone hub X20HB8880 are equipped with a modular hub extension. 1 or 2 additional slots are available depending on the bus base. The X20HB1881 hub expansion module can be operated in these slots. It is important
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