Siemens AG 6FC9310-1MB01 Keyboard Circuit Board

Siemens 6FC9310-1MB01 is a SINUMERIK keyboard changeover switch accessory for SINUMERIK CNC systems. This three-channel (3-WAY) V.24/RS-232-C switch routes the keyboard connection among up to three sources, allowing selection of the active keyboard interface without rewiring. Suppliers describe it explicitly as a SINUMERIK (ACCESSORIES) KEYBOARD CHANGEOVER SWITCH (V.24) with 3 CHANNELS, and the ordering number is consistently listed as 6FC9310-1MB01 (with variant references such as 6FC93101MB01). In practical terms, it functions as a dedicated keyboard switch box used within SINUMERIK installations to manage multiple keyboard or terminal interfaces that communicate over V.24/RS-232-C. The part is marketed by several authorized vendors, including Lektronix and BVS Electronics, under that exact model and description, confirming its role as a three-channel keyboard changeover solution for SINUMERIK environments. Typical applications include SINUMERIK machine tools or CNC cells where a single operator keyboard may be shared across multiple controllers or where keyboard input routing needs to be switched quickly.