The Siemens 6GK7277-1AA10-0AA0 is a SCALANCE CSM 1277 Compact Switch Module designed specifically for the SIMATIC S7-1200 controller platform. It is an unmanaged 4-port Industrial Ethernet switch that multiplies the single Ethernet interface of an S7-1200 CPU, enabling simultaneous connection of up to three additional Ethernet devices such as operator panels (HMI), programming devices (PG), or other controllers.
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