The SINAMICS G115D 6SL3520-0XH21-5AA0 is a 1.5 kW wall-mounted distributed drive with digital/analog I/O control — the simplest entry point into decentralized drive technology. No fieldbus configuration, no network hardware, no communication protocol to set up. Wire the start/stop signals, connect the speed reference, and the drive runs. The IP65/IP66 FSA enclosure (380 × 216 × 129 mm) mounts directly on the conveyor frame.

When Does I/O Control Make More Sense Than a Fieldbus Drive?

I/O Control is the right choice when the application needs basic speed control — run at a fixed speed, change speed based on a product sensor, or follow an analog reference from a simple controller — and the cost and complexity of a fieldbus network are not justified. No AS-i master, no PROFINET controller, no network engineering. Digital inputs handle start/stop, direction, and preset speed selection; an analog input accepts a 0–10 V or 4–20 mA speed reference. The drive reports ready, running, and fault status via digital outputs. This is decentralized drive control at its most straightforward.

What Can the 1.5 kW I/O Drive Power?

With 8.2 A overload (4.1 A continuous) at 380–480 V 3-phase, this drive handles SIMOGEAR 2KJ8 geared motors up to frame size 132 — the full FSA power ceiling. It suits constant-speed conveyors, feeder belts, and simple positioning tasks where the speed profile is determined by external sensors or a basic logic controller. Integrated STO (Safe Torque Off) via F-DI means safety is built in without external contactors — wire the safety input directly to an emergency stop circuit.

Frequently Asked Questions

Can I upgrade from I/O Control to a fieldbus later?

The G115D communication interface is determined at the hardware level — the AA0 (I/O Control) variant cannot be field-upgraded to AS-i or PROFINET. If fieldbus integration is a future requirement, select the AF0 (AS-i) or AB0 (PROFINET) variant at the time of purchase.

Does this drive need a PLC to operate?

No. The I/O Control variant can operate standalone — wire a speed potentiometer to the analog input and a switch to the digital input for start/stop. However, most installations use a PLC or relay logic for coordinated conveyor control.