Put multiple variables into global object

[MR76]

Hi,
I want to put multiple messages I'm getting from a PLC into a global Object. How can I do that?

I tried to change a code I ripped of another node-red instance, but can't get it to work.

var msgTopic = msg.topic;
var msgPayload = msg.payload;
var itemsArray=  flow.get("items")|| [];
var auto, warn, err;
var arrData = [];


//Daten an globale Variable übergeben
var data=global.get("obStatus");


if (msgTopic.Automatik > 0){
    // inp.auto_ein = msgPayload;
    itemsArray[0] = msgPayload;
}

else if (msgTopic.Warnung > 0){
     //inp.auto_halt = msgPayload;
     itemsArray[1] = msgPayload;
     } 

else if (msgTopic.Stoerung > 0){
     //inp.ba_auto = msgPayload;
     itemsArray[2] = msgPayload;
     } 


var newObject = {"Automatik": itemsArray[0],
               "Warnung": itemsArray[1],
                "Stoerung": itemsArray[2],
}


//msg.payload = inp;
msg.payload = newObject;

global.set("obStatus",newObject);
flow.set("items",itemsArray);

return msg;

this is what the sensor data looks like

Does anyone have an idea?

best regards

[Steve-Mcl]

I suspect flow.get("items") already has an object stored inside of it. Try deleting it from the context manager in the sidebar and run your function again.

[MR76]

It's empty. When I delete it it comes back after a few seconds.

[Steve-Mcl]

Can you show us what it contains??

[MR76]

I haven't used this anywhere else

[Steve-Mcl]

To understand what is going on, I need to know what is in the global context, the flow context, the incoming message and the outgoing result. Without each part it is difficult to assess.

[MR76]

This is the incoming stream of messages. They are read every 5 seconds.

This is what the context looks like with my current code.

I want to combine Automatik, Warnung and Störung into one global object I can use in other flows.

This is what the flow looks like

[{"id":"f490a8c0.7aa2e8","type":"function","z":"9cb96d17.d9b33","name":"","func":"var msgTopic = msg.topic;\nvar msgPayload = msg.payload;\nvar itemsArray=  flow.get(\"items\")|| [];\nvar auto, warn, err;\nvar arrData = [];\n\n\n//Daten an globale Variable übergeben\nvar data=global.get(\"obStatus\");\n\n\nif (msgTopic.Automatik > 0){\n    // inp.auto_ein = msgPayload;\n    itemsArray[0] = msgPayload;\n}\n\nelse if (msgTopic.Warnung > 0){\n     //inp.auto_halt = msgPayload;\n     itemsArray[1] = msgPayload;\n     } \n\nelse if (msgTopic.Stoerung > 0){\n     //inp.ba_auto = msgPayload;\n     itemsArray[2] = msgPayload;\n     } \n\n\nvar newObject = {\"Automatik\": itemsArray[0],\n               \"Warnung\": itemsArray[1],\n                \"Stoerung\": itemsArray[2],\n}\n\n\n//msg.payload = inp;\nmsg.payload = newObject;\n\nglobal.set(\"obStatus\",newObject);\nflow.set(\"items\",itemsArray);\n\nreturn msg;","outputs":1,"noerr":0,"x":830,"y":480,"wires":[[]]},{"id":"81ce9481.5f2ff8","type":"s7 in","z":"9cb96d17.d9b33","endpoint":"","mode":"single","variable":"","diff":true,"name":"","x":680,"y":480,"wires":[["f490a8c0.7aa2e8"]]}]

[Steve-Mcl]

So when you export a flow, you should consider the person helping you does not have access to things like your PLC - so the flow you posted was of no use. It is always helpful to use INJECT nodes to simulate your data.

Any how, I now understand why it doesnt work

Try this instead...

const msgTopic = msg.topic;
const msgPayload = msg.payload;
const obStatus = global.get("obStatus") || {};
let { Automatik, Warnung, Stoerung } = obStatus
//node.warn({ Automatik, Warnung, Stoerung })

if (msgTopic === "Automatik") {
    obStatus.Automatik = msgPayload;
    //node.warn({ "setting Automatik": Automatik })
} else if (msgTopic === "Warnung") {
    obStatus.Warnung = msgPayload;
    //node.warn({ "setting Warnung": Warnung })
} else if (msgTopic === "Stoerung") {
    obStatus.Stoerung = msgPayload;
    //node.warn({ "setting Stoerung": Stoerung })
}

global.set("obStatus", obStatus);
const items = [obStatus.Automatik, obStatus.Warnung, obStatus.Stoerung]
flow.set("items", items);

msg.payload = obStatus;
return msg;

Proof...

Demo flow...

[{"id":"08a790b59d189683","type":"function","z":"6f3a24bd7ed7326b","name":"join and store","func":"const msgTopic = msg.topic;\nconst msgPayload = msg.payload;\nconst obStatus = global.get(\"obStatus\") || {};\nlet { Automatik, Warnung, Stoerung } = obStatus\n//node.warn({ Automatik, Warnung, Stoerung })\n\nif (msgTopic === \"Automatik\") {\n    obStatus.Automatik = msgPayload;\n    //node.warn({ \"setting Automatik\": Automatik })\n} else if (msgTopic === \"Warnung\") {\n    obStatus.Warnung = msgPayload;\n    //node.warn({ \"setting Warnung\": Warnung })\n} else if (msgTopic === \"Stoerung\") {\n    obStatus.Stoerung = msgPayload;\n    //node.warn({ \"setting Stoerung\": Stoerung })\n}\n\nglobal.set(\"obStatus\", obStatus);\nconst items = [obStatus.Automatik, obStatus.Warnung, obStatus.Stoerung]\nflow.set(\"items\", items);\n\nmsg.payload = obStatus;\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1080,"y":1220,"wires":[["0f442bb1006c4b18"]]},{"id":"4b0b1c007ea0da93","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Automatik","payload":"true","payloadType":"bool","x":880,"y":1140,"wires":[["08a790b59d189683"]]},{"id":"5cec8a2575223a4c","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Warnung","payload":"true","payloadType":"bool","x":880,"y":1180,"wires":[["08a790b59d189683"]]},{"id":"9325262c80cd3b04","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Stoerung","payload":"true","payloadType":"bool","x":880,"y":1220,"wires":[["08a790b59d189683"]]},{"id":"52b6d5559be8bb36","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Automatik","payload":"false","payloadType":"bool","x":890,"y":1280,"wires":[["08a790b59d189683"]]},{"id":"4bd9df71f509943f","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Warnung","payload":"false","payloadType":"bool","x":880,"y":1320,"wires":[["08a790b59d189683"]]},{"id":"78a443d88f3e1783","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Stoerung","payload":"false","payloadType":"bool","x":880,"y":1360,"wires":[["08a790b59d189683"]]},{"id":"0f442bb1006c4b18","type":"debug","z":"6f3a24bd7ed7326b","name":"debug 65","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1110,"y":1280,"wires":[]}]

[Steve-Mcl]

And now the low-code no-code version...

Demo flow...

[{"id":"4b0b1c007ea0da93","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Automatik","payload":"true","payloadType":"bool","x":880,"y":1140,"wires":[["57b091e23b3baf31"]]},{"id":"5cec8a2575223a4c","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Warnung","payload":"true","payloadType":"bool","x":880,"y":1180,"wires":[["57b091e23b3baf31"]]},{"id":"9325262c80cd3b04","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Stoerung","payload":"true","payloadType":"bool","x":880,"y":1220,"wires":[["57b091e23b3baf31"]]},{"id":"52b6d5559be8bb36","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Automatik","payload":"false","payloadType":"bool","x":890,"y":1280,"wires":[["57b091e23b3baf31"]]},{"id":"4bd9df71f509943f","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Warnung","payload":"false","payloadType":"bool","x":880,"y":1320,"wires":[["57b091e23b3baf31"]]},{"id":"78a443d88f3e1783","type":"inject","z":"6f3a24bd7ed7326b","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"Stoerung","payload":"false","payloadType":"bool","x":880,"y":1360,"wires":[["57b091e23b3baf31"]]},{"id":"0f442bb1006c4b18","type":"debug","z":"6f3a24bd7ed7326b","name":"debug 65","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1140,"y":1300,"wires":[]},{"id":"57b091e23b3baf31","type":"join","z":"6f3a24bd7ed7326b","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":true,"timeout":"","count":"3","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":1070,"y":1220,"wires":[["67c7828af6dd69f2"]]},{"id":"67c7828af6dd69f2","type":"change","z":"6f3a24bd7ed7326b","name":"store","rules":[{"t":"set","p":"items2","pt":"flow","to":"[payload.Automatik, payload.Stoerung, payload.Warnung]","tot":"jsonata"},{"t":"set","p":"obStatus2","pt":"global","to":"payload","tot":"msg","dc":true}],"action":"","property":"","from":"","to":"","reg":false,"x":1110,"y":1260,"wires":[["0f442bb1006c4b18"]]}]

[MR76]

@Steve-Mcl

So when you export a flow, you should consider the person helping you does not have access to things like your PLC - so the flow you posted was of no use. It is always helpful to use INJECT nodes to simulate your data.

Sorry, I didn't think of that.
Thanks a lot for your help.