Integrator note — fieldbus slice, safety CPU separation
The Siemens SIMATIC 3RK1301-0BB13-0AA4 is a direct starter motor controller built for PROFINET and PROFIBUS DP networks — two protocols on the same module, so it fits existing S7-1500 or ET 200SP islands without a gateway. Supply is 24 V DC (21.6 to 26.4 V rated, 20.4 V min, 28.8 V max). The safe state is load circuit open, which means on loss of communication or power the output drops and the motor stops — no latching. Trip class is adjustable between 10 and 20, so you match the motor's thermal curve in software rather than swapping a heater pack.
Mounting & integration — checklist cadence
Fastening method is pluggable on terminal module — no DIN-rail clip; the base unit snaps onto a separate terminal module that carries the main power wiring. Mounting position is vertical or horizontal. Dimensions: 65 mm wide, 150 mm deep, 290 mm high. Plenty of room for a standard 600 mm deep enclosure. Vibration resistance is 2g; shock resistance 5g / 11 ms.
Sourcing posture — line-down spare, BOM freeze
MTBF is 14 a; MTTFd is 31 a — the safety-related failure rate is better than the basic reliability figure, which is typical for a SIL-rated motor starter. Operating frequency maximum is 80 cycles per hour — not for high-speed indexing; sized for conveyor or pump starts.