Siemens 6NH7800-3AA20

Siemens 6NH7800-3AA20 is a Sinaut ST7 TIM 32 communication processor designed for SIMATIC S7-300 installations, delivering a dedicated telecontrol link through an integrated MD2 modem. This TIM 32 variant includes the MD2 modem for a specialized connection, while MD3 and MD4 interfaces are not installed in this model, and it ships with a WAN connecting cable (6NH7700-2AR60) to enable network access. As part of the SINAUT ST7 family, the 6NH7800-3AA20 serves as a communications module rather than a PLC CPU, extending remote connectivity for industrial control and telemetry. Typical applications include remote monitoring and control of distributed field devices in automation networks, where the MD2-based link provides a direct telecontrol path between the S7-300 controller and distant subsystems. The part is documented specifically as TIM 32 with 6NH7800-3AA20, confirming its role as a communications processor within SIMATIC environments and its suitability for setups requiring a dedicated MD2 modem-enabled interface.