What this kit is
The Siemens 3SK2942-2AA10 is a SIRIUS safety relay starter kit designed for PROFINET-based safety applications. It bundles the 3SK2112-2AA10 basic unit with the 3SK2511-2FA10 PROFINET interface module, plus SIRIUS Safety ES Premium software and the required cables (cite:). The kit handles 2-channel safety inputs and 2 non-safety-related auxiliary contacts, with valve monitoring and monitored start-up built in (cite:,).
Snaps onto standard DIN rail or screws in place with an additional push-in lug (cite:). At 45 mm wide and 100 mm tall, it takes up one standard module slot on the rail (cite:,). Depth is 124.5 mm — check clearance behind the backplate before wiring (cite:). Mounting position is any orientation (cite:).
Terminals accept 20 to 16 AWG solid or stranded wire, 1x or 2x conductors per clamp (cite:,). The enclosure is IP20 — keep it inside a rated cabinet (cite:,).
Electrical and timing specs
Runs on 24 V DC nominal, with the input signal range 15 to 30 V DC (cite:,). Input delay is adjustable 0 to 150 ms; readback time maxes at 400 ms (cite:,). The light test period runs 3 ms (cite:). Total current draw from the supply is up to 7 A (cite:).
Fieldbus and environment
PROFINET IO and PROFIBUS DP protocols are supported when the respective interface module is fitted, with 64-bit cyclic data (cite:,). Unshielded sensor cable runs up to 600 m; shielded runs reach 1000 m (cite:,). Shock rated at 15g for 11 ms (cite:).