What this 1FK2 servo delivers on the S120 bus
The Siemens 1FK2104-5AF11-0SB0 is a SIMOTICS S-1FK2 HD servo motor sized at M0 = 2.4 Nm with PN = 0.75 kW at nN = 3000 rpm on a 380–480 V supply, and PN = 0.375 kW at nN = 1500 rpm on a 200–240 V supply — meaning a single frame covers both the 400 V and 230 V SINAMICS S120 line-ups without re-sizing the mechanics. A holding brake is fitted, so the motor holds the load at standstill without back-driving the drive; the absolute single-turn 22-bit encoder (AS22DQC) gives the position loop the resolution it needs for high-dynamic axes without an external mounted encoder.
Connections, shaft, and enclosure for cabinet or machine mounting
The shaft is cylindrical D19 × 40 mm and the housing is rated IP65, which keeps coolant and cutting-fluid splash out of the machine envelope typical of machine-tool and packaging-line axes — the seal rating is at the body, not at the connector face. Both the power connector and the DRIVE-CLiQ plug are size M17, so cable selection is constrained to the M17 signal-and-power cordset family rather than mixed M23/M12 layouts. Because DRIVE-CLiQ carries the encoder and electronic nameplate data over the same cable, motor identification on the S120 is automatic at first power-up — the commissioning engineer only needs to confirm the topology slot in STARTER or TIA Portal, not hand-enter encoder resolution or motor parameters.
Compliance and the made-to-order commercial code
The motor has been RoHS-compliant since 01-07-06, and REACH Art. 33 candidate-list information is provided by Siemens on request — meaning the substance-restriction declarations needed for EU ship-out are already on file at the manufacturer rather than requiring a one-off disclosure run. The unit ships under product class C (products manufactured / produced to order that cannot be reused or re-issued against credit), so lead time is build-driven, not shelf-driven. It carries Group Code R220 and Product Group 9021 inside Siemens' commercial structure, and export-control classification shows AL:N / ECCN:N_CNDU, so no special-export licence is triggered for typical industrial destinations. Packaging is one piece per carton at 452 × 250 × 267 mm — relevant only when sizing inbound kit for a panel build.