Product Description:

The 3BP151 is a controller backplane produced by B & R Automation for the System 2005 Controllers series. As a passive carrier, it houses processor, power supply, and I/O cards so that machine-level logic, motion coordination, and fieldbus links can be consolidated inside a single enclosure. Within an automation cabinet, the unit acts as the structural and electrical backbone that interconnects plug-in modules and routes the internal system bus. Because the backplane itself is passive, the installed cards provide the computing and interface functions while the rack supplies the shared connection path.

The assembly is protected to IP20, which provides finger-safe touch protection but no sealing against splashed liquids. Its front rail spans 480 mm, while the card cage depth is only 23 mm, so it can fit in slim panels without consuming much cabinet space. Overall height reaches 165 mm, matching standard 19-inch sub-rack proportions for orderly cabinet layout. A total of 12 module connectors are arranged across the backplane, and each slot is keyed to help prevent mis-insertion while reserving positions for CPU, communication, and specialty I/O cards. The shallow profile also leaves more room in front of the rack for cable routing and ventilation paths.

Along the internal bus, the board allocates a maximum of 10 System/I/O positions for main control tasks. An additional 10 I/O addresses are reserved for expansion cards that increase sensing or actuator counts as the machine grows. Side clearances of 20 mm must be maintained during installation so natural convection can remove heat from populated modules. The same spacing also helps preserve signal quality across the copper backplane by limiting heat buildup and reducing crosstalk between adjacent cards. Keeping those clearances open also makes it easier to seat modules fully in their connectors without obstructing neighboring cards.