Siemens 6DD2920-0AQ0 SU70 Input / Changeover Module – SIMADYN D 6DD2920-0AQ0 is the Siemens SU70 Input / Changeover Module used within the SIMADYN D control platform. SIMADYN D is Siemens' modular control platform for technology and drive control. Its hardware architecture includes CPU, I/O, communication and specialized technology modules, with engineering support through STEP 7, CFC and SFC. The SU70 is identified within this architecture as an Input / Changeover Module,