Safety Distress Circuit

Roy's picture
Roy

Offline

Joined: Apr 28, 2019

Replies: 4
Safety Distress Circuit
April 28, 2019 - 6:10pm

Hello everyone!

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:

Picture1.jpg

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.

 

 

 

 

 

 

 

Violet's picture

Offline

Joined: Aug 16, 2018

Replies: 33
Question is confusing
April 29, 2019 - 11:12am

You question is really confusing since not many proplr could understand the application you are using the circuit for.

May be you should try reframing the question with simple logic instead of using the actual application words 

Roy's picture
Roy

Offline

Joined: Apr 28, 2019

Replies: 4
Simple Logic
April 29, 2019 - 7:11pm

,Hi Violet

.Thank you for your replay

  ? Can you recommend a free circuit design tool

.I will draw my inquiry

Aswinth Raj's picture

Offline

Joined: Aug 16, 2016

Replies: 923
There are so many, easy eda,
May 1, 2019 - 11:16am

There are so many, easy eda, fritzing are among my fav.

Roy's picture
Roy

Offline

Joined: Apr 28, 2019

Replies: 4
Hi Aswinth!
May 1, 2019 - 6:47pm

Hi Aswinth!

Thank you, I will test it.

Roy's picture
Roy

Offline

Joined: Apr 28, 2019

Replies: 4
Following scheme describe my
May 12, 2019 - 11:19am

Following scheme describe my inquiry for IC :

Capture.JPG

Technical requirements IC:

1.SW1 trigger input 1&2 of IC and sends momentry pulse (1 sec) N.O. type to output ports 7&8 of IC.

2.Inputs 1&2 must be "latch" type - SW1 is disable after triggering.

3.SW2 is enabled only after SW1 is triggerd (latch mode).

4.SW2 release SW1 with momentary pulse (non-latch).

5.When SW2 is triggered, IC starts selectable cycle time of 5-10 sec.

6.At the END of cycle time, momentry pulse (1 sec) N.O. type recieved at ports 7&8.

 

Thank you 

 

Aswinth Raj's picture

Offline

Joined: Aug 16, 2016

Replies: 923
There is no single IC that
May 13, 2019 - 5:55pm

There is no single IC that can work as per your requirment. You can either create a complex circuit using JK flip-flop and then use a momentory latching circuit on the input. But again you will need a timer IC on the output along with this for your delay requirments.

The best way to go from here is to use a microcontroller. 

Roy's picture
Roy

Offline

Joined: Apr 28, 2019

Replies: 4
Can you recommend a non
May 16, 2019 - 5:19pm

Can you recommend a non-expensive microcontroller for the mission?