Action 1902.Logical AND

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Logical AND
Logical AND1007×422 72.1 KB

Help mentions “Target subject will use AND function on its initiators to determine its output”
Exactly what I need, an AND function :smiley:

But how to define multiple initiators :red_question_mark:
The top window frame “Initiator” accepts only ONE :exclamation_question_mark:

Right click redirect me to the document “Overview of Velbus actions” but action 1902 is not mentioned there, well nothing about group [19] Logical functions at all.
So, where is the help for these logical actions?

Thanks a lot for your insights?
Regards
Alain

2

Hi

AND is just the logic type

How you do that in Velbus is different

Using the Inhibit while Closed or Inhibit while Open actions is the way forward.

Base line

An initiator has an action to a subject

The restrictions in logic happen where a third thing either inhibits the first Initiator OR it inhibits the Subject.

Depending on what you want to happen.

  • Are you stopping the Initial Inhibitor from doing its action

Or

  • Are you trying to stop the subject from responding to any Actions.
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Do these VLP files help you?

There is a 3 trigger AND gate in here

ALL three buttons must be pressed and held for the light to come on
BUT the normal Switch still operates the lamp normally
AND gate logic three triggers.vlp (25.0 KB)

Whereas

this version

The “normal” button, will NOT operate ANYTHING, unless *ALL Three other buttons are pressed

AND gate locks a button.vlp (25.0 KB)

HOWEVER

This version

There are FOUR thermostats

ONE of these is a perfectly normal room stat, where a user can set required temperatures of any time in any mode

BUT

That thermostat will ONLY ever come of out of SAFE mode WHEN Three other thermostats are BELOW 15ºc

AND lock thermostat until three others are COLD.vlp (25.0 KB)

Reverse engineering the modules you are using to

VMBxRYxx-20
VMBPIRx-20

and adding some other modules

This example requires ALL FOUR initiators to be in the PRESSED state for the relay to operate
AND Logical action - FOUR triggers.vlp (28.1 KB)

(I have not tested this in any way, as I am yet to require this functionality on any project, if you are really struggling, I am happy to deploy this VLP onto a test rig)

1 Like
4

Thanks a lot for the examples Stuart !
In the mean time I found a faq document on the velbus site showing below picture

AND_Function
AND_Function1006×407 56.4 KB

So I build something based on this drawing.
Manual action still ok
Auto open 1/2 hour before sunset still ok
Wait until tomorrow to check light & both temperatures… …

This is what you showed in “AND gate logic three triggers”.

Regards
Alain

1 Like
5

Lucky me, action 1902 works only on relay modules ending with “-20”

I have all “-10” in my installation

1 Like
6

Just roll back to the logic solutions as suggested :wink: