Fibaro fgbs-222 and IN1

I connected my fibaro to a descaler via a relay:


I connected the yellow one to the 2 and the ground one to the common.

I want to have a notification when there is a open contact but I can’t find the what z-wave field I need to use to check the contact and how I need to perform the automations.

the only what I see is in the log : smart implant last seen

Can you help me ?
kr Hans