Siemens 6GK7277-1AA10-0AA0 Compact Switch Module

Siemens 6GK7277-1AA10-0AA0 is the Compact Switch Module (CSM 1277) used to connect a SIMATIC S7-1200 PLC to an Industrial Ethernet network and extend the network to up to three additional nodes. This unmanaged switch supports 10/100 Mbit/s Ethernet and provides four RJ45 ports for straightforward device-to-device connections such as controllers, I/O blocks, and other networked modules. It requires an external 24 V DC power supply and includes LED diagnostics to monitor link status and activity at a glance. The package is described as part of the SIMATIC NET family and typically ships with product documentation (including the electronic Equipment Manual on CD-ROM for the S7-1200 module). The 6GK7277-1AA10-0AA0 variant is specifically built to facilitate small, low-complexity network topologies by aggregating the S7-1200 and up to three additional participants into a compact, unmanaged switch, delivering reliable 10/100 Mbps performance for industrial applications where configuration-free operation is desirable. Unmanaged by design, it requires no software configuration.