The Siemens 6SL3520-1XB01-1AA0 is the I/O Control variant of the SINAMICS G115D wall-mounted distributed drive family, rated at 1.1 kW with a 380–480 V 3-phase supply. I/O Control is the hardwired command interface — four programmable PNP digital inputs accept 24 V DC signals directly from pushbuttons, selector switches, or a PLC output card — no fieldbus configuration or network infrastructure required.

What does I/O Control mean in the G115D?

I/O Control is Siemens' term for the hardwired digital command variant. Unlike the PROFINET model — where speed, direction, and diagnostic data travel over a network cable — the I/O Control variant receives all commands as discrete 24 V DC signals at its digital input terminals. This makes it:

• Compatible with any control system — relay panels, basic PLCs without PROFINET, or even manual pushbutton stations
• Fast to commission — wire the inputs, set parameters via Mini-USB or SD card, and the drive is ready; no network topology to plan
• Electrically simple to troubleshoot — every command is a measurable 24 V signal at a terminal, requiring only a multimeter

The four digital inputs are configurable for fixed speeds, jog, enable, and direction control. Two additional DI/DO points can be used as extra inputs or as status outputs. A 24 V DC supply (250 mA typical for FSA) powers the control electronics, available via terminals, M12 L-coding, or 7/8" connector.

What motor types are supported?

The drive delivers 3.1 A rated output current (High Overload) with 200% overload capability — 6.2 A for 3 seconds and 150% for 57 seconds. It supports IE3 three-phase asynchronous motors, IE4 synchronous reluctance motors, and pre-configured SIMOGEAR geared motor combinations. Control modes include V/f (linear, quadratic, parameterizable), V/f with FCC for improved low-speed torque, and sensorless vector control for precise speed regulation. Output frequency spans 0–550 Hz in V/f mode and 0–240 Hz in vector mode, with pulse frequency adjustable from 4 to 16 kHz in 2 kHz steps. The setpoint resolution is 0.01 Hz — sufficient for precise conveyor speed trimming.

Frequently Asked Questions

When should I choose I/O Control over PROFINET?

Choose I/O Control when your application does not require cyclic process data exchange with a PLC over a network. Typical scenarios: a standalone conveyor section controlled by a simple relay or micro-PLC; a retrofit where adding PROFINET infrastructure is not justified; or a fixed-speed application where the drive runs at one or two preset speeds selected by a switch. Choose PROFINET when you need remote diagnostics, dynamic speed profiling from the PLC, or functional safety via PROFIsafe on the same cable.

How is the drive commissioned without a fieldbus?

Commissioning is via the Mini-USB port using a PC with Startdrive in TIA Portal, or by loading parameters from a SINAMICS SD memory card. The Smart Access Module (SAM) web server is also available for parameter monitoring and adjustment via a browser, using a Wi-Fi connection to the drive. Once commissioned, day-to-day operation requires only the hardwired I/O signals.

Can the 24 V control supply be sourced from the motor contactor circuit?

Yes — the I/O Control electronics require 24 V DC ±15% at approximately 250 mA (FSA). This can be supplied from the machine's 24 V control circuit, a dedicated power supply, or the optional integrated 24 V PSU module. Ensure the supply is SELV/PELV per EN 61800-5-1 for safety compliance.