The SINAMICS G115D 6SL3520-2XB44-0AB0 is the I/O variant of the 4 kW wall-mounted distributed frequency converter for SIMATIC-controlled conveyor systems. It carries an NCNR (Not Suitable for New Designs) status. Like the PROFINET variant, it requires integrated fan cooling at this power level — the enclosure depth extends to 169 mm to accommodate the fan while keeping the 425 × 180 mm mounting footprint.

What I/O does the AB0 suffix provide?

The AB0 suffix designates the enhanced digital I/O variant: more digital inputs and outputs than the AA0 base I/O model, plus expanded Safe Torque Off (STO) capability via dedicated fail-safe digital inputs (F-DI). All control — start/stop, direction, speed reference, and status feedback — is hardwired through discrete terminals. No fieldbus configuration or network infrastructure is required.

When choose hardwired I/O over PROFINET?

Hardwired I/O suits applications where the control cabinet or upstream PLC already uses discrete wiring, where no PROFINET network is present on the machine, or where the added complexity of fieldbus commissioning is not justified. The AB0 variant eliminates the need for M12 PROFINET cabling, network switches, and GSDML file management — a standard digital I/O terminal block is all that is needed to run the drive.

How does the I/O variant differ from the PROFINET variant at 4 kW?

Both the AB0 and AF0 variants share the same 4 kW power stage, FSB frame, and C2 EMC filter. The difference is the control interface: AB0 uses hardwired digital I/O with F-DI for STO, while AF0 uses PROFINET with PROFIsafe over M12 D-coded connectors. Electrically, the drive hardware is identical — the choice is purely about how the control system connects to it.