Beckhoff Automation BK3120 Industrial Computer

Beckhoff BK3120 is a PROFIBUS DP bus coupler that provides DP V1 services to Beckhoff's BK3xx0 Bus Terminal system, acting as the PROFIBUS DP slave interface for connected I/O. It supports up to 64 DP bus terminals (255 with K-bus extension) and operates from a 24 V DC supply using a D-sub 9-pin bus connection; the module measures 50 mm wide, 100 mm high, 68 mm deep, weighs about 170 g, and mounts on a 35 mm DIN rail with IP20 protection. Electrical specifications include a 24 V DC supply with about 70 mA base current plus K-bus current (max 500 mA total), 2.5× starting current, and 500 V dielectric strength between power and fieldbus; a recommended fuse of up to 10 A is advised. Operating conditions span -25°C to +60°C (ambient) with up to 95% relative humidity (non-condensing); it complies with EN 60068 vibration/shock requirements and EN 61000 EMC immunity/emission standards. Certifications on the type plate include CE, UKCA, cULus, EAC, GL, IECEx and ATEX markings, reflecting Beckhoff's global deployment for PROFIBUS applications.