The Siemens 6SL3520-0XE04-0AA0 is the I/O Control variant at 4 kW in the SINAMICS G115D distributed drive series, carrying the XE04 catalog designation in the XE0x sub-series. This AA0 variant fills the final communication gap at XE04: with AF0 confirmed in batch 17 and AB0/AA0 now confirmed in this batch, XE04 at 4 kW is complete across all three G115D communication interfaces.

I/O Control at 4 kW: the fieldbus-free FSB ceiling

The AA0 variant communicates via discrete digital inputs (run/stop, direction, fixed speed selection) and an analog input (0–10 V or 4–20 mA). A fail-safe digital input (F-DI) provides STO at SIL3. At 4 kW — the highest FSB rating — the drive powers mid-length accumulation conveyors. These are moderately numerous on a line (perhaps 15–30 drives), placing them in the grey zone where I/O Control wiring overhead starts to become noticeable but is still manageable. For greenfield installations at this drive count, AF0 or AB0 may be preferred. For a brownfield 4 kW motor replacement where the cable infrastructure already exists, the AA0 variant drops in without network changes.

XE04 complete: the last gap closed

XE04 now carries AA0, AF0, and AB0 — matching the comm coverage of its XE44 (XE4x) and 1XA04/1XA24 (1XA) counterparts. The XE0x sub-series at 4 kW is fully verified. Combined with the newly discovered XE03 (3 kW FSB fanless), the XE0x sub-series now spans 3–7.5 kW across FSB fanless, FSB fan-cooled, and FSC frames — with all three communication variants confirmed across the entire confirmed range.