The VW3-A58354U is a N2 communication option card designed for the Altivar 58 drive series from Telemecanique. It slots into the drive to add N2 (Metasys) network connectivity, enabling supervisory control and monitoring from a building management system.
The N2 protocol is a legacy building-automation bus used primarily in Metasys systems by Johnson Controls. Fitting this card to an Altivar 58 drive lets the drive appear as a node on that network — speed reference, status, and fault codes pass over the serial link without hardwired I/O.