Siemens 6GK7277-1AA10-0AA0 Compact Switch Module (CSM 1277) connects a SIMATIC S7-1200 PLC to Industrial Ethernet and supports up to three additional nodes at 10/100 Mbit/s. It is an unmanaged switch with four RJ45 ports and requires an external 24 V DC power supply, featuring diagnostic indicator LEDs to monitor power and link status. Designed for the S7-1200 family, the CSM 1277 enables straightforward expansion of small Ethernet networks within the Siemens automation ecosystem.
