The BMEXBP1200 is a 12-slot Ethernet backplane from the Modicon X80 range — the physical backbone that holds I/O modules and a bus controller together. Slot breakdown: 8 for standard bus X modules, plus 4 dedicated to Ethernet X bus modules, which isolates high-speed communications on their own segment. Draws 164 mA from the 24 V DC supply and 86 mA from the 3.3 V DC rail, totalling 3.9 W on the 24 V side. That's the budget you need to reserve in the power module; the backplane itself doesn't drive field loads, but it does light up every module's bus interface. MTBF reliability is 1166108 hours.
IP20, ambient range 0 to 60 °C, humidity 5 to 95 % non-condensing.
Carries CE mark under Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU. That covers the backplane itself; the modules you plug in carry their own compliance. No UL or CSA listing in the spec, but the X80 range is typically installed under a UL 508A panel-level listing.