B&R Industrial Automation GmbH X20BM31 Bus Module

The X20BM31 bus module from B&R Industrial Automation is the base bus interface for all double-width X20 I/O modules in the X20 system, providing the core interconnection and power distribution among multiple double-width modules in a configuration. It is a 24 VDC keyed unit that carries the internal I/O power supply through to connected modules, with a backplane bus power draw of 0.13 W. The nominal I/O supply is 24 VDC, and the module specifies a permissible contact load of 10 A for the connected I/O devices. The X20BM31 carries IP20 protection and is CE- and UKCA-certified, with UL/cULus listing for industrial control equipment in appropriate configurations. This bus module serves as the foundational element for expanding X20 I/O installations in automated machinery and processes, enabling reliable power distribution and seamless module-to-module communication across double-width I/O assemblies.