The SINAMICS G115D 6SL3520-1XA24-0AA0 is the 4 kW wall-mounted distributed frequency converter in FSB frame with I/O Control — the hardwired digital/analog communication variant in the SINAMICS G115D series 1XA catalog designation. Designed for conveyor zones where the PLC provides discrete speed reference via digital inputs and analog 0–10 V or 4–20 mA signals — and no fieldbus protocol is required — it delivers 10.2 A rated output current with 200% overload for 3 seconds. Integrated fan cooling sustains continuous 4 kW operation, driving IE3 asynchronous or IE4 synchronous reluctance motors via direct SIMOGEAR 2KJ8 geared motor mounting. STO is achieved via the fail-safe digital input (F-DI) from an external safety relay.

When is I/O Control the right choice for a 4 kW conveyor drive?

The AA0 I/O Control variant is purpose-built for applications where a fieldbus adds cost and complexity without operational benefit. Three scenarios favor I/O Control at 4 kW: (1) the PLC cabinet is adjacent to the conveyor zone — running a few discrete wires for start/stop, direction, and speed reference is simpler and cheaper than configuring a PROFINET node; (2) the machine builder standardizes on hardwired I/O across all drive sizes for commissioning simplicity — no IP addresses, no GSDML files, no network topology planning; (3) the end user specifically requires I/O Control for compatibility with existing plant wiring standards or maintenance team familiarity. The 1XA24 catalog code identifies this as the 1XA series entry for 4 kW FSB I/O Control.

What signals does the I/O Control interface provide?

The AA0 variant provides discrete digital inputs for run/stop, direction, and fixed-speed selection; digital outputs for status (running, fault, ready); and analog inputs accepting 0–10 V or 4–20 mA for continuous speed reference from a PLC analog output card. An additional digital input can be configured as the F-DI for STO from an external safety relay. This is the most straightforward control interface in the G115D lineup — no communication protocol configuration, no network hardware — just terminal block wiring to the PLC I/O cards.

What motors and gearboxes can it drive?

The 6SL3520-1XA24-0AA0 is optimized for direct mounting to SIMOGEAR 2KJ8 geared motors in IE3 or IE4 efficiency classes. Integrated 400 V AC brake control eliminates external brake contactors. Encoderless vector control supports both V/f control and sensorless vector control via parameterization — speed reference comes from the analog input, drive configuration via the SD card slot or a local service interface. The Q8/0 motor connector and M12 signal interfaces enable quick commissioning.

Frequently Asked Questions

Can I add PROFINET to this drive later?

No — the communication interface is hardware-determined at order time. The AA0 variant has no fieldbus interface hardware. To migrate to PROFINET, replace with the AB0 variant (e.g., 6SL3520-1XA24-0AB0 or 0XE44-0AB0). Motor, gearbox, and power connections remain unchanged.

What is the difference between 1XA24 and XH24?

Catalog designation only. 1XA24 (6SL3520-1X…) and XH24 (6SL3520-0X…) identify the same 4 kW FSB fan-cooled hardware — 425 × 180 × 169 mm, 10.2 A rated, integrated fan. Both support AA0, AF0, and AB0 variants. Drives are functionally interchangeable.