The Siemens 3RK1911-1AA22 is an ECOFAST Hybrid fieldbus connection that transitions a PROFIBUS network from an IP20 environment (inside the control panel) to an IP65-rated field-side connection. It merges bus and power supply into a single hybrid cable run, using two channels with CU/CU socket-to-socket configuration for infeed. This eliminates the need for a separate power cable alongside the PROFIBUS drop, reducing routing complexity on the machine frame.
The transition module is designed for the boundary between the control cabinet (IP20 side) and the field cabling (IP65 side). On the cabinet side, it accepts a standard PROFIBUS connection; on the field side, it mates with ECOFAST hybrid connectors that carry both bus and 24 VDC power in a single cable sheath. The 2-channel configuration means two field devices can be fed from one transition point, each with its own bus address and power feed. The CU/CU socket/socket arrangement suggests a pass-through topology — the infeed enters one socket and continues out the other to the next device in the daisy chain, with the hybrid cable carrying both signals and power.