The SINAMICS G115D 6SL3520-2XB42-2AB0 is the I/O variant at 2.2 kW — the entry power level to the FSB frame. It carries an NCNR (Not Suitable for New Designs) status. Larger than the FSA enclosure at 425 × 180 × 134 mm, the FSB frame dissipates 2.2 kW of IGBT losses through natural convection alone — no fan, no moving parts, just terminal-block control.

What I/O does the AB0 suffix provide at 2.2 kW?

The AB0 suffix provides expanded digital I/O: more discrete inputs and outputs than the base AA0 variant, plus expanded Safe Torque Off (STO) via fail-safe digital inputs (F-DI). Start/stop, forward/reverse, and preset speed selection are all wired directly to screw or spring-clamp terminals. No fieldbus configuration is required — the drive responds to 24 V signals from the upstream controller.

When does hardwired I/O make sense at the FSB entry level?

At 2.2 kW — a common power rating for medium conveyor zones — hardwired I/O keeps the drive integration straightforward. The maintenance technician troubleshoots with a multimeter at the terminal block, not with network diagnostic tools. For machines where the PLC already outputs discrete 24 V signals and there is no PROFINET backbone on the line, the AB0 variant avoids adding network infrastructure solely for the drives.

How does it differ from the PROFINET variant at 2.2 kW?

The AB0 and AF0 variants share the identical 2.2 kW fanless FSB power stage, C2 EMC filter, and braking chopper. The AB0 replaces the AF0's M12 fieldbus ports with additional digital terminals and F-DI for STO — same motor performance, different control wiring philosophy.