What this servo motor is, and why the 40 mm shaft matters
Siemens 1FL2104-2BG01-0MC0 is a SIMOTICS S-1FL2 low-inertia AC servo motor in the 40 mm shaft-height frame, rated 0.75 kW with a nominal speed of 3000 rpm and standstill / rated torque of 2.4 Nm — a small-frame, high-dynamics motor sized for the lighter end of the SINAMICS S200 drive family. The motor ships without a holding brake, with a plain shaft to tolerance N, an AM21-type hybrid connector for power and signal, and an integrated 21-bit absolute encoder — meaning cable pinout, encoder protocol and brake option are all locked to the S200 drive's wiring diagram rather than to a generic servo. IP65 with oil sealing on the housing means the 1FL2104-2BG01-0MC0 is built for the cabinet-exit end of a machine — near the gearbox, ball screw or conveyor idler — where splash, cutting fluid and airborne oil mist would kill a standard IP64-rated servo.
Matching drive, encoder and cable — the S200 dependency
Siemens lists the matching drive for this motor as the SINAMICS S200 — a 200 V three-phase AC class, so the cabinet feed, DC-bus sharing and STO wiring all have to follow the S200 topology rather than a generic servo amplifier. The 21-bit absolute encoder on the 1FL2104-2BG01-0MC0 is the single-cable / hybrid-connector variant Siemens defines for the S200 line, so the cable set is the S200 OCC / hybrid motor cable, not the older two-cable SINAMICS V90 loom — a wrong cable spec is the most common reason an S200 commissioning fails the first encoder turn-on.
Active production and built-to-order status
Product class on this MPN is C — built-to-order, non-returnable and not re-usable for credit — which means a wrong shaft / connector / brake variant ordered against the BOM cannot be returned to the factory and has to be re-purchased, so the BOM line must be locked against the S200 drive variant and the cable set before the RFQ is raised.
Compliance and export profile
The 1FL2104-2BG01-0MC0 has been RoHS-compliant since 01-01-18 and carries the REACH Article 33 duty-to-inform flag, so a current declaration pack is on the Siemens product page and forms part of the EU ship-out paperwork.