I need assistance with safety distress circuit design for Nurse Call System.
Following is system connection:
1.Nurse Call Station with LCD screen
2.Main panel- connection board
3.Bed Head Console
-Nurse Call Station & Bed Head Console connected to main panel - connection board.
Following picture describe Inputs of Bed Head Console:
Mentioned "SHOWER SWITCH" is the input I need safty design for.
At first operation, patient pulls emergancy switch and trigger the alarm at Nurse Call Station, indicating room & bed number stress call.
Problem occurs with second trigger, patient pulls emergancy switch again and disabled the alarm at Nurse Call Station side.
I resolved trigger disable safty with a letch relay type DS2E-ML2-DC24V.
Second stage, is to disable latch relay and disabling the alarm system from "SHOWER SWITCH" again at the same time, with another cancellation button.
For that purpose I tried using relay timer type 24V FRM01 Multifunctional Relay Module Loop Delay Timer Switch Self-locking,
With no luck.
According to my tests, it seems that I need more components or a different design.
Thank you in advance.