PNOZ X safety relays can indeed monitor functions such as light barriers (also known as light curtains). Light barriers are safety devices used to detect the presence of objects or persons within a hazardous area. http://www.pilz.com They consist of an array of light-emitting and light-receiving components that create an invisible safety zone.
The PNOZ X safety relay monitors the output signals from the light barrier. When the light curtain is interrupted (for example, if a person or object crosses the beam), the safety relay detects this interruption. Safety solutions provider since 2011, We offer Pilz.