Of course this is NOT a sales pitch.
I just want to make sure everybody knows what I am talking about. I am not looking for publications that are describing top-level applications, such as wiring complete safety modules.
Of course any type of "safety relay" used is fine as long they are built according to EN50205 / ICE61810-1. The one I showed is just unique in many ways of providing better fault recognition with the pair wise contacts coupling system.
I am looking for applications that typically have two door switches as control signals, and provide a safe switching output for the load output. I have found one book so far from a German organization, the BIA-Report, where they discuss such applications, applications in accordance with then EN 954-1.
If any one knows more of this kind of publications, I would appreciate very much any reply.