The 6SL3520-2XB04-0AF0 is the PROFINET-equipped variant of the 4 kW FSB G115D B-connector drive — and the entry point to active cooling in the FSB frame. At 4 kW the power stage transitions from natural convection (134 mm depth) to integrated fan cooling (169 mm depth), enabling continuous-duty operation without thermal derating. The 10.2 A HO output with 200% 3 s overload handles conveyor sections that run through full shifts — palletizers, packaging infeeds, or merges where the drive cannot afford a thermal timeout.

What does the AF0 PROFINET variant provide over AB0 or AA0?

AF0 integrates PROFINET and PROFIsafe directly via the drive's M12 D-coded 2-port switch, with EtherNet/IP also supported. Safety commands travel over the same network cable — no separate safety relay wiring. For an OEM building a PROFINET-controlled conveyor line, this means the drive appears as a standard PROFINET device in TIA Portal, safety logic and motion control configured in one engineering environment. The AB0 and AA0 variants are I/O-only — suitable when fieldbus is not part of the control architecture.