Hi maybe I don't have understand right the function flow.set... ; and flow.get... ; the whole project works as well, but in special situations I could detect irregularities I find out, that I noticed that states of variables are not saved when activating the first "Valve" the context data are li…

hi Paul thank you for your hints and support I have understand now I have divide the Link-connections of this 4 groups now it work fine PS sorry about the wrong placement of those ``` it was a bit late last night :innocent:

Follow.set stores the value in context storage. Flow.get retrieves data from context storage each time a function node runs it starts fresh and nows nothing about what happened the last time it ran. Try adding a node.warn("Valve30pen="+Valve30pen) right after the var Valve30pen - msg. Valve30pe…

you mean: var Valve3Open = msg.Valve3Open; in the function I get a warn-flag "Valve3Open is already defined" otherwise I couldn't find any change

var Valve30pen - msg. Valve30pen; was a typo (I cut the tip of my index finger last week and it is effecting my typing :roll_eyes:) Did you add the node.warn("Valve30pen="+Valve30pen) as the second line of your 'function' node? The was all I wanted you to do.

thank you "zenofmud" for your patience yes, I have now add this and in the Debug at first, I get the right result "Valve 1 is 1" after when I start Valve 2 (is not in the same line), the I get from the same debug-node the answer " Valve 1 is undefined" >>> that makes me suspicious!!! (Valve 3 …

[image] maxmueller50: Valve 1 is undefined" Ask yourself "Which line in my function is setting the value of that variable?"

hi Colin the Value comes from the Flow Valve(n) after a https request "Valve(n) is open" - resp. "Valve(n) is close" (as return massage) - connected via Link to "this" function, where the condition should be stored by flow.set (1 is open, 0 is close), see screenshot

The line that sets the value of the variable is var Valve1Open = msg.Valve1Open Did the latest message in have a value in msg.Valve1Open? The flow.set command in the first message sets the flow variable. If you want to fetch the previous value of the flow variable when the second message comes i…

Can you please export your function node and paste it to a reply (not a screen shot)

the 5 function of this group, which determine whether the supply-pump must run { "id": "4d9ed806.e42d08", "type": "link in", "z": "efd2f080.df5cf8", "name": "Supply_ON", "links": [ "449c44f9.470ec4", "72b230cd.0ce04", "…

Ok the way you have your flow laid out, every message will be going to all four of the 'Valve' function nodes. So if data is for valve 6 + 7, it will also go to 'Valve 1 + 3' and if it doesn't contain msg.Valve30pen, you will get the error. I'm surprised you haven hit more with all the function nod…

Store a state of a value "flow.set"

General

zenofmud 4 February 2023 13:41 2

Follow.set stores the value in context storage.
Flow.get retrieves data from context storage
each time a function node runs it starts fresh and nows nothing about what happened the last time it ran.

Try adding a
node.warn("Valve30pen="+Valve30pen)
right after the
var Valve30pen - msg. Valve30pen;
statement and see what you get.

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Store a state of a value "flow.set"

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