In the PNOZ X series by Pilz, base units indeed come in various configurations, including safety relays and safety control systems. http://www.pilz.com These units are designed for applications where safety

These expansion modules typically connect to the base unit via a dedicated interface, allowing for easy scaling of safety functions. They are used to extend the number of safety contacts

The safety relay continuously monitors the state of the e-stop button(s). It checks if the button is pressed or released and whether the circuit is complete or interrupted. http://www.pilz.com If

Using one PNOZ X safety relay per safety function is a common practice to ensure clear, reliable, and manageable safety monitoring in industrial applications. Each PNOZ X safety relay is