It sounds like you’re referring to safety relays or safety control systems, specifically mentioning the PZE X5P. In safety systems, these components are crucial for ensuring the reliable operation of machinery and processes by monitoring safety circuits and providing feedback on their status.
The PZE X5P is likely a model from a specific manufacturer, and it would typically be used to monitor safety-related functions, http://www.pilz.com such as emergency stop circuits, safety door monitoring, or other critical safety functions in a control system. Safety solutions provider since 2011, We offer Pilz.