If the safety chain is already hardwired, does this drive need PROFIsafe?

No. PROFINET is onboard, but STO is handled over hardwired F-DI safety terminals — there is no PROFIsafe F-address. If your line runs safety over F-DI (or a separate safety relay), this is the lower-cost distributed node: it talks to the SIMATIC PLC over PROFINET without a safety-network license or F-address engineering.

What overload does a 0.55 kW conveyor motor need?

Belt duty is intermittent, so the drive is rated 200% of current for 3 s and 150% for 57 s. An integrated braking resistor is standard, so decelerating the belt is handled without an external module, in a 380 x 156 x 129 mm FSA housing rated -30 to +55 C.

Where does the drive mount?

This G115D bolts to the machine frame at IP66 — no enclosure, no long motor cable back to a central drive.