The Siemens 3SF5811-2AB10 is an AS-Interface emergency-stop pushbutton in a square metal enclosure with a red mushroom actuator and yellow top. It carries one AS-i slave configured as an F slave with two inputs (2I), meaning it reports its status directly over the AS-i bus without a separate safety relay — the safety controller reads the E-stop state through the AS-i network. Rated IP67, so the housing and the actuator seal against dust and temporary immersion — suitable for washdown zones on packaging lines or outdoor conveyor transfer stations. The 22 mm mounting diameter fits standard panel cutouts, and the enclosure fastens vertically or horizontally. The rotate-to-unlatch mechanism means the operator twists the mushroom head to reset after a stop; positive opening is confirmed, so the NC contacts physically break even if welded — this is the mechanical safety feature that meets IEC 60947-5-1 requirements for emergency-stop devices.
Integration notes
The AS-i slave type is F slave, 2I — this is a safety slave that communicates via the AS-i safety protocol. It requires a safety monitor on the AS-i network to interpret the F-slave data. The pre-wired strip terminal simplifies field wiring: no separate connector needed, just strip and clamp. The metal enclosure and holder give it mechanical robustness for heavy-use environments like machine tools or material handling. This covers most indoor industrial environments and unheated storage conditions.