The 6SL3520-0XN04-0AA0 is the 4 kW I/O Control variant in the G115D fan-cooled FSB frame — delivering 10.2 A rated (20.4 A overload) from a 380–480 V 3-phase supply with hardwired digital and analog I/O. No fieldbus, no network configuration — just terminal-block control for conveyor segments that need mid-range power without communication overhead.

Why I/O Control at 4 kW?

The AA0 I/O Control variant uses digital inputs for start/stop, direction, and fixed-speed presets, plus an analog input (0–10 V or 4–20 mA) for speed reference. At 4 kW — the power level where fan cooling becomes mandatory in the G115D — this variant serves two practical scenarios. First, the retrofit: replacing a 4 kW cabinet-mounted drive with a machine-mounted distributed drive while reusing existing hardwired control circuits. Second, the standalone conveyor module: an OEM machine shipped with its own local control station, running at preset speeds with no need for remote diagnostics or parameter changes over a network. PROFINET and AS-Interface are available at this power level (XN04 AF0 and AB0 variants), but when the control requirements are simple and the plant has no fieldbus at the drive level, I/O Control eliminates the gateway, switch port, and configuration steps.

4 kW and the fan-cooling threshold

At 4 kW, natural convection can no longer dissipate the output-stage heat — the G115D transitions from fanless FSB (1.1–3 kW, 425 × 180 × 134 mm) to fan-cooled FSB (425 × 180 × 169 mm, +35 mm depth for the integrated fan). The fan is the only wear component; Siemens rates it for the drive's full service life under normal ambient conditions. The 24 V DC control supply draws 510–550 mA on fan-cooled variants — roughly double the 250–290 mA of fanless FSB models. Size the control panel power supply accordingly when deploying multiple 4 kW drives on a conveyor line.

XN04 in the G115D catalog generation system

XN04 is the intermediate-generation catalog code for the 4 kW fan-cooled FSB. The earliest designation is XM04, XN04 followed, and XH24 is the current catalog code. All three are physically identical — same enclosure, same power stage, same mounting dimensions. When replacing a drive, any of the three can substitute directly as long as the communication variant (AA0/AF0/AB0) matches.

Frequently Asked Questions

How is the speed setpoint given on the I/O Control variant?

Via a 0–10 V analog input (potentiometer or PLC analog output), 4–20 mA current loop, or fixed-speed digital input presets configured during commissioning. The drive ships with default parameters that can be adjusted via the SINAMICS Smart Access keypad or USB interface.

Can I add a fieldbus later?

No. The communication interface (AA0/AF0/AB0) is factory-configured hardware — not field-upgradable. If you anticipate adding PROFINET or AS-Interface later, select the corresponding variant at time of purchase.

What is the 24 V DC current draw for this fan-cooled variant?

Approximately 510–550 mA for logic, communication, and the integrated cooling fan. Budget this per drive when sizing the control panel 24 V DC supply for multi-drive conveyor systems.