The PSR-URM4L contact
extension device from Phoenix Contact is highly suited for light grid
applications. It allows users to efficiently process
safety-related OSSD signals of a light grid as floating contacts, therefore supporting safety-relevant circuits up to PLe.
contact extension device is specifically designed for use with Electro-sensitive
protective equipment (ESPE) such as light grids. Such systems normally include
switched-mode OSSD signals that make it possible to detect cross-circuits in
the cabling. The relay is resistant to test pulses
generated by the CFSE. This allows for the implementation of applications that
comply with PLe or SIL 3 without the need to reconnect the device to the
external device monitoring circuit.