Need help desiging a wiring diagram

Thread Starter

glenneharding

Joined Jan 31, 2019
8
I am building a board similar to the attached image for my employer and I can't seem to figure out how I should wire it. The 4 toggle switches will turn on a red or green light in each of the 4 zones but I need a master switch (keyed) that will disable the toggles so that the lights can not be changed by just anyone unless they have the key.
Board Diagram 001 JPG.jpg
Thank you for any advice on this project.
 

MaxHeadRoom

Joined Jul 18, 2013
19,000
Most P.B. manufacturers offer a key switch in some form or another such as Digikey stock
CKL13EFW01-002
Place in line with the feed for the other switches.
Similar to this

Max.
 

ericgibbs

Joined Jan 29, 2010
8,716
hi Max,
I think he wants the selected Red/Green lights to stay ON, when the key switch is OFF.?
E
 

MaxHeadRoom

Joined Jul 18, 2013
19,000
If Eric is correct then do you have any experience with small micro's?
It should be a cinch doing it that way.;)
Max.
 

Thread Starter

glenneharding

Joined Jan 31, 2019
8
Yes....I do want the lights to remain on when master switch is off. The master switch is for disabling the toggles but the lights should remain on. No...I am a CNC machine operator and carpenter so I have no experience with micros. So my question really is.....can you have a switch that disables another switch and the thing that is turned on stays on?
Thank you everyone for your input.
 

MaxHeadRoom

Joined Jul 18, 2013
19,000
I don't see it being done with a simple switch that will retain all the present states without some logic, and a hard wired version may get Very messy!
Max.
 

Thread Starter

glenneharding

Joined Jan 31, 2019
8
That's what I was afraid of.... So how could someone do it with logic? I'm a pretty sharp guy if I could get a diagram I could build it. Thanks again for your help.
 

Papabravo

Joined Feb 24, 2006
12,385
Indus
That's what I was afraid of.... So how could someone do it with logic? I'm a pretty sharp guy if I could get a diagram I could build it. Thanks again for your help.
Industrial relays are not cheap, and this might be doable with ladder logic. How much can you spend? Hundreds? Thousands?
 

MaxHeadRoom

Joined Jul 18, 2013
19,000
Is this a One Off or is this for a production item?
A Smart Relay would be one option, but not cheap.
Max.
 

Thread Starter

glenneharding

Joined Jan 31, 2019
8
I have to build about 10 of these for a production line. they don't want anybody change in the red lights to green without the proper authority. I guess I will just go to my fall-back position which is to make each one of the toggles a keyed toggle.
Thank you ever so much for your help you guys are awesome.
 

LesJones

Joined Jan 8, 2017
2,316
How about 4 SR flipflops using for example 2 CD4011 (Quad NAND gates). This is a very rough sketch of the idea showing just 2 of the 4 flipflops.
030319.jpg


The master switch would disconnect the ground from commons of the 4 switches so that the toggle switches could not change the state of the flipflops. The LEDs could be driven using CD4049 or DC4050 buffers or small mosfets.

Les.
 

Thread Starter

glenneharding

Joined Jan 31, 2019
8
How about 4 SR flipflops using for example 2 CD4011 (Quad NAND gates). This is a very rough sketch of the idea showing just 2 of the 4 flipflops.
View attachment 169346


The master switch would disconnect the ground from commons of the 4 switches so that the toggle switches could not change the state of the flipflops. The LEDs could be driven using CD4049 or DC4050 buffers or small mosfets.

Les.
I like this idea....I will look into it. Thank you
 

Alec_t

Joined Sep 17, 2013
10,354
Here's another option for the logic :-
SwitchDisabler.PNG
U1a is a clock oscillator which is enabled/disabled by the master switch. When enabled, outputs 1-4 take up the states of the other switches. U2 is an octal latch circuit to hold those states when the oscillator is disabled.
 
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