Siemens Compact Switch Module CSM 1277, order number 6GK7277-1AA10-0AA0, is an unmanaged Ethernet switch designed to connect a SIMATIC S7-1200 controller to Industrial Ethernet with four RJ45 ports at 10/100 Mbps. It supports connecting the S7-1200 and up to three additional nodes on the same network, providing a compact, fixed-port solution for small automation networks. The module is powered from an external 24 V DC supply and includes LED diagnostics to monitor link and activity status. This CSM 1277 module is part of the SIMATIC NET lineup, enabling simple, reliable Ethernet connectivity within the S7-1200 ecosystem.
