KEYENCE SL-R11-D22 Light Curtain Safety Relay

The KEYENCE SL-R11-D22 is a light curtain safety relay that processes signals from KEYENCE light curtain sensors to control machine safety outputs. It is used in industrial automation to enforce a safe stop when a guarded field is interrupted, protecting personnel and equipment. As a dedicated safety device, the SL-R11-D22 sits in the safety circuit between light curtain devices and the machine controller, translating protective-field interruptions into a controlled safety action within the system. This model, identified as SL-R11-D22, is part of KEYENCE’s line of light curtain safety relays and is chosen for projects requiring reliable protection linked to light curtain technology. Applications include automated manufacturing cells, packaging lines, and other machinery setups where a light curtain provides a protective zone. The description here reflects the device’s role as a safety relay for light curtains and its purpose within safety-rated automation architectures.