The Siemens 3RA2711-1AA00 is a Sirius IO-Link function module for direct motor starting. It snaps onto the front of communication-capable contactors in the 3RT20…-…..-0CC0 series, adding IO-Link connectivity and integrated surge suppression via a varistor. The removable terminal block allows pre-wiring of the panel before the module is fitted. The module itself measures 37 mm high by 45 mm wide by 75 mm deep and can be mounted in any orientation.
Control and communication — IO-Link interface
The IO-Link interface on this module provides bidirectional communication between the starter and a higher-level controller. It carries parameter data, diagnostic information, and process values over a standard 3-wire sensor cable, eliminating the need for parallel control wiring for each starter. The module does not support AS-Interface — the communication path is exclusively IO-Link. This suits applications where a single master can address multiple IO-Link devices on a daisy-chained network, reducing I/O module count in the PLC rack. EMC immunity meets IEC 60947-1 ambient A (industrial sector); emitted interference complies with CISPR11 for the same environment. Electrostatic discharge withstands 8 kV per IEC 61000-4-2. These ratings support integration into CE-marked industrial machinery without additional filtering for most installations.
Environmental and mechanical limits for panel planning
The module is rated for pollution degree 3 (conductive or dry non-conductive pollution that becomes conductive due to condensation), common in industrial enclosures without climate control. Shock resistance is 11 g for 15 ms; vibration resistance is 10 to 55 Hz at 0.35 mm amplitude. These figures match typical machine-mounted applications where the starter panel is attached to the machine frame rather than a separate control cabinet. Maximum installation altitude is 2000 m above sea level. Above this altitude, air-insulation clearance and cooling derating should be reviewed per IEC 60947-1 guidelines.