Siemens 6SE9996-0XA21 T-Connector CM2 MMI PROFIBUS

Siemens 6SE9996-0XA21 T-Connector CM2 MMI PROFIBUS is a PROFIBUS T-connector designed to attach Siemens CB155 PROFIBUS module to a PROFIBUS DP network in Combimaster CM2 MMI configurations. This accessory forms the bus connection for the CM2 MMI PROFIBUS interface and is typically used with the CB155 module, with Siemens documentation noting the 6SE9996-0XA21 as the preferred T-connector. The product is part of the CM PROFIBUS component set, and the standard ecosystem includes the PROFIBUS terminator 6SE9996-0XA22 and cables 6SE9996-0XA23 (1 m), 6SE9996-0XA24 (5 m), 6SE9996-0XA25 (10 m) and the cable link 6SE9996-0XA26, which together support proper BUS termination and segment extension. Siemens also notes variant order numbers for different CS configurations (for example, CS B units may use 6SE9996-0XA18 or 6SE9996-0XA20 instead of 0XA21), but 6SE9996-0XA21 remains the canonical T-Connector for CM2 MMI PROFIBUS deployments.