ABB 1SAP220500R3001 D2 Bus Communication Interface Module

ABB DC551-CS31 CS31 bus module — part number 1SAP220500R0001 (revision R3001 is listed alongside R0001) — is a D2 Bus Communication Interface Module that serves as a CS31 bus interface for decentralized I/O in ABB AC500/CS31 control systems. It plugs into a TU551 or TU552 terminal base and communicates with a CS31 master over the 1‑wire CS31 bus. The device provides 8 digital inputs and 16 digital outputs that operate at 24 V DC, with each output rated up to 0.5 A. It is powered from a 24 V DC supply with a maximum draw around 0.5 A. This CS31 module enables remote I/O expansion for sensors and actuators in automation installations, allowing modular, scalable I/O topologies without routing every signal to the central controller. Proper installation requires a CS31-compatible base and CS31 wiring, and the module integrates with ABB’s CS31 ecosystem for reliable controller communication.