# Value considered as UNDEFINED

**URL:** <https://discourse.nodered.org/t/value-considered-as-undefined/63447>\
**Category:** General\
**Created:** [4 June 2022 11:41 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447 "2022-06-04T11:41:41Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![Theodros](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/theodros/32/61068_2.png) [@Theodros](https://discourse.nodered.org/u/Theodros)\
**Post date:** [4 June 2022 11:41 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/1 "2022-06-04T11:41:41Z")

</div>

Hi guys, I have a problem that I don't understand at all.

First to understand the situation:

My programs works by going on a dashboard and by selecting a variable. When this variable is selected the list number is returned so that the modbus flex getter go search at the right place the value of this variable. This value is than joined in an object with the list number and kept in a msg.payload for later use.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/3/3/331e0f55524dd119a3d79544838b7d7595838a29.png)

This object is than put in the flow so that the function node can use it.  
The function node works by getting an int number, putting it as a boolean number and then via the list number, choosing the right bit to show on the dashboard.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/5/052c9a68a6f947a94157a952e23db79d7c6e226c.png)

here's the debug:

So when I select a value in the dashboard going from 0 to 16 the program will work properly but when the value is bigger it will print me this undefined. And I don't understand why it stops working when the list number of the dashboard is bigger than 16.  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/9/a9abc09410c61a370bacb8b7837239f55cda1e30.png)

```auto
[
    {
        "id": "ad42f873412c2f98",
        "type": "tab",
        "label": "RPI Shelter EIA",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "5bad0cb6533899a8",
        "type": "ui_button",
        "z": "ad42f873412c2f98",
        "name": "",
        "group": "780cfd9c93f7b572",
        "order": 2,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "Lire",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "className": "",
        "icon": "",
        "payload": "",
        "payloadType": "str",
        "topic": "topic",
        "topicType": "msg",
        "x": 90,
        "y": 740,
        "wires": [
            [
                "e85dee5092aec692"
            ]
        ]
    },
    {
        "id": "6817ad78d442051b",
        "type": "ui_button",
        "z": "ad42f873412c2f98",
        "name": "",
        "group": "18997b9d48e95027",
        "order": 1,
        "width": 0,
        "height": 0,
        "passthru": true,
        "label": "INITIALISATION",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "className": "",
        "icon": "",
        "payload": "",
        "payloadType": "date",
        "topic": "topic",
        "topicType": "msg",
        "x": 120,
        "y": 320,
        "wires": [
            [
                "f56948d866932748"
            ]
        ]
    },
    {
        "id": "f56948d866932748",
        "type": "file in",
        "z": "ad42f873412c2f98",
        "name": "Requête1",
        "filename": "C:\\Users\\Theodros\\Documents\\GRTgaz\\NODE-RED_GRTgaz\\Tables modbus\\Requete1 bool.csv",
        "format": "utf8",
        "chunk": false,
        "sendError": false,
        "encoding": "none",
        "allProps": false,
        "x": 360,
        "y": 320,
        "wires": [
            [
                "1e304abcae2ccf65"
            ]
        ]
    },
    {
        "id": "1e304abcae2ccf65",
        "type": "csv",
        "z": "ad42f873412c2f98",
        "name": "",
        "sep": ",",
        "hdrin": false,
        "hdrout": "all",
        "multi": "mult",
        "ret": "\\r\\n",
        "temp": "label",
        "skip": "0",
        "strings": true,
        "include_empty_strings": "",
        "include_null_values": "",
        "x": 510,
        "y": 320,
        "wires": [
            [
                "3500365835d5d8ac"
            ]
        ]
    },
    {
        "id": "3500365835d5d8ac",
        "type": "function",
        "z": "ad42f873412c2f98",
        "name": "REMPLISSAGE",
        "func": "msg.options = msg.payload.map((el, index) => {\n\nreturn { [el.label] : index }\n \n})\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 680,
        "y": 320,
        "wires": [
            [
                "b4cd49f83874842e"
            ]
        ]
    },
    {
        "id": "b4cd49f83874842e",
        "type": "ui_dropdown",
        "z": "ad42f873412c2f98",
        "name": "",
        "label": "",
        "tooltip": "",
        "place": "Select option",
        "group": "780cfd9c93f7b572",
        "order": 3,
        "width": 0,
        "height": 0,
        "passthru": true,
        "multiple": false,
        "options": [],
        "payload": "",
        "topic": "S1",
        "topicType": "str",
        "className": "",
        "x": 880,
        "y": 320,
        "wires": [
            [
                "a02a3e6a86c1ea6f",
                "1dd903ddc2f6e1dd"
            ]
        ]
    },
    {
        "id": "cf3418e05735fbd7",
        "type": "ui_text",
        "z": "ad42f873412c2f98",
        "group": "780cfd9c93f7b572",
        "order": 1,
        "width": 6,
        "height": 1,
        "name": "",
        "label": "BOOL",
        "format": "{{msg.payload}}",
        "layout": "col-center",
        "className": "",
        "x": 350,
        "y": 260,
        "wires": []
    },
    {
        "id": "0eaf9f8b5014fd0f",
        "type": "ui_text",
        "z": "ad42f873412c2f98",
        "group": "780cfd9c93f7b572",
        "order": 4,
        "width": 0,
        "height": 0,
        "name": "BOOL",
        "label": "",
        "format": "{{msg.payload}}",
        "layout": "col-center",
        "className": "",
        "x": 1070,
        "y": 740,
        "wires": []
    },
    {
        "id": "f80557635255a803",
        "type": "function",
        "z": "ad42f873412c2f98",
        "name": "Adressage",
        "func": "const num = msg.payload.S1; //Chiffre allant de 0 à 79\nconst val = msg.payload.B1[0]; // booléen\n\nnewArr=[]; //crée un nouveau tableau\n\nbit = val.toString(2).padStart(16,\"0\") ; //transforme le résultat sous forme de binaire\ntab = bit.split('');//sépare chaque chiffre\n\n//On inverse le tableau afin que les valeurs soit dans le bon sens\nfor(let i = tab.length - 1; i>=0; i--)\n{\n newArr.push(tab[i]);\n}\n\nmsg.payload = newArr[num];\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 670,
        "y": 740,
        "wires": [
            [
                "0eaf9f8b5014fd0f",
                "bc7cb18204d747dc"
            ]
        ]
    },
    {
        "id": "a02a3e6a86c1ea6f",
        "type": "function",
        "z": "ad42f873412c2f98",
        "name": "modbus flex getter options",
        "func": "const num = msg.payload; //Chiffre allant de 0 à 78\n\nconst parsedInput = { WORD_OFFSET: Math.floor(num / 16) }\n\nmsg.payload= {\n 'fc': 3,\n 'unitid': 1,\n 'address': 59 + parsedInput.WORD_OFFSET,\n 'quantity': 1,\n}\nreturn msg",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 960,
        "y": 480,
        "wires": [
            [
                "b562440633b74130"
            ]
        ]
    },
    {
        "id": "b562440633b74130",
        "type": "modbus-flex-getter",
        "z": "ad42f873412c2f98",
        "name": "",
        "showStatusActivities": false,
        "showErrors": false,
        "logIOActivities": false,
        "server": "7d0292a23936c0ce",
        "useIOFile": false,
        "ioFile": "",
        "useIOForPayload": false,
        "emptyMsgOnFail": false,
        "keepMsgProperties": false,
        "x": 1220,
        "y": 480,
        "wires": [
            [
                "09e7a16b624a6065"
            ],
            []
        ]
    },
    {
        "id": "09e7a16b624a6065",
        "type": "change",
        "z": "ad42f873412c2f98",
        "name": "",
        "rules": [
            {
                "t": "set",
                "p": "topic",
                "pt": "msg",
                "to": "B1",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 1440,
        "y": 480,
        "wires": [
            [
                "1dd903ddc2f6e1dd"
            ]
        ]
    },
    {
        "id": "d872c1545f718544",
        "type": "change",
        "z": "ad42f873412c2f98",
        "name": "",
        "rules": [
            {
                "t": "set",
                "p": "selected",
                "pt": "flow",
                "to": "payload",
                "tot": "msg"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 1650,
        "y": 320,
        "wires": [
            []
        ]
    },
    {
        "id": "1dd903ddc2f6e1dd",
        "type": "join",
        "z": "ad42f873412c2f98",
        "name": "",
        "mode": "custom",
        "build": "object",
        "property": "payload",
        "propertyType": "msg",
        "key": "topic",
        "joiner": "\\n",
        "joinerType": "str",
        "accumulate": true,
        "timeout": "",
        "count": "1",
        "reduceRight": false,
        "reduceExp": "",
        "reduceInit": "",
        "reduceInitType": "",
        "reduceFixup": "",
        "x": 1420,
        "y": 320,
        "wires": [
            [
                "d872c1545f718544"
            ]
        ]
    },
    {
        "id": "f78c38bb795f3c5c",
        "type": "modbus-server",
        "z": "ad42f873412c2f98",
        "name": "",
        "logEnabled": false,
        "hostname": "0.0.0.0",
        "serverPort": 10502,
        "responseDelay": 100,
        "delayUnit": "ms",
        "coilsBufferSize": 10000,
        "holdingBufferSize": 10000,
        "inputBufferSize": 10000,
        "discreteBufferSize": 10000,
        "showErrors": false,
        "x": 640,
        "y": 100,
        "wires": [
            [],
            [],
            [],
            [],
            []
        ]
    },
    {
        "id": "e85dee5092aec692",
        "type": "change",
        "z": "ad42f873412c2f98",
        "name": "Envoie des données",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "selected",
                "tot": "flow"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 300,
        "y": 740,
        "wires": [
            [
                "f80557635255a803",
                "b07658c8cddfcebd"
            ]
        ]
    },
    {
        "id": "bc7cb18204d747dc",
        "type": "debug",
        "z": "ad42f873412c2f98",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 930,
        "y": 580,
        "wires": []
    },
    {
        "id": "b07658c8cddfcebd",
        "type": "debug",
        "z": "ad42f873412c2f98",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 390,
        "y": 540,
        "wires": []
    },
    {
        "id": "8a43d090e4c4e17a",
        "type": "ui_spacer",
        "z": "ad42f873412c2f98",
        "name": "spacer",
        "group": "780cfd9c93f7b572",
        "order": 5,
        "width": 6,
        "height": 1
    },
    {
        "id": "2d8e385d43e906c7",
        "type": "ui_spacer",
        "z": "ad42f873412c2f98",
        "name": "spacer",
        "group": "780cfd9c93f7b572",
        "order": 10,
        "width": 6,
        "height": 1
    },
    {
        "id": "373285ef2508ebc9",
        "type": "ui_spacer",
        "z": "ad42f873412c2f98",
        "name": "spacer",
        "group": "780cfd9c93f7b572",
        "order": 15,
        "width": 6,
        "height": 1
    },
    {
        "id": "ba8e0a9132cd1daf",
        "type": "ui_spacer",
        "z": "ad42f873412c2f98",
        "name": "spacer",
        "group": "15528da52822872e",
        "order": 6,
        "width": 6,
        "height": 1
    },
    {
        "id": "7ad12eb46dbba9d7",
        "type": "ui_spacer",
        "z": "ad42f873412c2f98",
        "name": "spacer",
        "group": "15528da52822872e",
        "order": 12,
        "width": 6,
        "height": 1
    },
    {
        "id": "780cfd9c93f7b572",
        "type": "ui_group",
        "name": "Requête 1",
        "tab": "0baea998ce75eabd",
        "order": 1,
        "disp": true,
        "width": 6,
        "collapse": false,
        "className": ""
    },
    {
        "id": "18997b9d48e95027",
        "type": "ui_group",
        "name": "INITIALISATION",
        "tab": "0baea998ce75eabd",
        "order": 4,
        "disp": true,
        "width": 8,
        "collapse": false,
        "className": ""
    },
    {
        "id": "7d0292a23936c0ce",
        "type": "modbus-client",
        "name": "",
        "clienttype": "tcp",
        "bufferCommands": true,
        "stateLogEnabled": false,
        "queueLogEnabled": false,
        "tcpHost": "0.0.0.0",
        "tcpPort": "10502",
        "tcpType": "DEFAULT",
        "serialPort": "/dev/ttyUSB",
        "serialType": "RTU-BUFFERD",
        "serialBaudrate": "9600",
        "serialDatabits": "8",
        "serialStopbits": "1",
        "serialParity": "none",
        "serialConnectionDelay": "100",
        "serialAsciiResponseStartDelimiter": "0x3A",
        "unit_id": "1",
        "commandDelay": "1",
        "clientTimeout": "1000",
        "reconnectOnTimeout": true,
        "reconnectTimeout": "2000",
        "parallelUnitIdsAllowed": true
    },
    {
        "id": "15528da52822872e",
        "type": "ui_group",
        "name": "Requête 3",
        "tab": "0baea998ce75eabd",
        "order": 3,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "0baea998ce75eabd",
        "type": "ui_tab",
        "name": "RPI Shelter EIA",
        "icon": "RPI Shelter EIA",
        "disabled": false,
        "hidden": false
    }
]

```

PS: Hope what I said is understandable, don't hesitate on correcting me or asking questions

---

<div class="post-metadata">

**Author:** ![UnborN](https://avatars.discourse-cdn.com/v4/letter/u/4491bb/32.png) [@UnborN](https://discourse.nodered.org/u/UnborN)\
**Post date:** [4 June 2022 12:18 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/2 "2022-06-04T12:18:24Z")

</div>

Hello Theodros,

What is the content of the `Requete1 bool.csv` file ?  
Can you share (in text form) in order to fully replicate your flow ?

---

<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [4 June 2022 12:24 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/3 "2022-06-04T12:24:31Z")

</div>

As far as I can tell `bit = val.toString(2).padStart(16,"0") ; ` creates a string 16 chars long. Then you split it to an array 16 elements long. So if list number is greater than 15 it will return undefined, as there are no array elements above 15.

---

<div class="post-metadata">

**Author:** ![Theodros](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/theodros/32/61068_2.png) [@Theodros](https://discourse.nodered.org/u/Theodros)\
**Post date:** [4 June 2022 12:38 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/4 "2022-06-04T12:38:39Z")

</div>

> 

COMPRESSEUR Started  
RADIATEUR D'HUILE Started  
LA POMPE À HUILE Started  
LA POMPE À EAU Started  
G1 FANS / GASCOOLER Started  
G2 FANS / GASCOOLER Started  
DE RECHANGE  
CHAUFFAGE SALLE DE COMPRESSEUR Started  
SOUPAPE D'ADMISSION Open  
POUSSOIR DE SOUPAPE 1ER ETAGE Open  
SORTIE/BLOWDOWN SOUPAPE Open  
ALARME VISUELLE ROUGE CLIGNOTANT ON  
ALARME VISUELLE BLEU CLIGNOTANT ON  
LAMPE DE BOUTON POUSSOIR ON  
VENTILATEUR D'EXTRACTION D'AIR Started  
RESET VARIATEUR DE VITESSE COMPRESSEUR Active  
SOUPAPE DE VIDANGE LIQUIDE Open  
TRIP HAUTE PRESSION (PSHH) Active  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
SOUPAPE D'ENTRÉE COMPRESSEUR Open  
SOUPAPE DE SORTIE COMPRESSEUR Open  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
BOUTON DE DÉMARRAGE  
BOUTON D'ARRÊT  
RÉINITIALISATION DES ALARMES  
CIRCUIT D'URGENCE OK  
CONTRÔLE DE TENSION  
LA PRESSIONDE L'AIR  
TEMPÉRATURE DE PANNEAU DE CONTRÔLE  
CONSENTEMENTEXTERNE  
COMPRESSEUREN EN MARCHE  
CHAUFFE A L'HUILE THERMIQUE  
FILTRE DE GAZ D'ADMISSION  
NIVEAU D'HUILE  
MOTEUR DE COMPRESSEUR THERMIQUE  
FILTRE À HUILE  
PRESSION DE GAZ DE SORTIE  
PRESSION DE GAZ D'ENTREE  
POMPE À EAU THERMIQUE  
G1 FANS THERMIQUE  
POMPE À HUILE THERMIQUE  
L'EXTRACTEUR THERMIQUE  
ESPACE VIDE NON FONCTIONNEL  
PTC MOTEUR  
DE RECHANGE  
G2 FANS THERMIQUE  
MODE LOCAL AUT  
MODE DISTANCE AUT  
HORS SERVICE  
DÉTECTEUR DE FLAMME D'ALARME CUMULATIVE  
THERMOSTAT COMPRESSEUR CHAUFFE  
THERMIQUE SALLE DE COMPRESSEUR CHAUFFE  
THERMIQUE SALLE DE CONTRÔLE CHAUFFE  
NIVEAU DE RÉCUPÉRATION D'HUILE  
CUMULATIVO ANOMALIA SENSORE GAS  
ALARME HAUTE CONCENTRATION DE GAZ À EFFET CUMULATIF  
DÉTECTEURS DE FUMÉE DE DÉFAUT COMP. PIÈCE  
DÉTECTEURS DE FUMÉE DE ALARM COMP. PIÈCE  
CUMULATIVO ANOMALIA SENSORE GAS  
ENTRÉE STATUS SLAM SHUT  
SOUPAPE EVA004 POSITION SWITCH-OPEN  
SOUPAPE EVA004 POSITION SWITCH-CLOSE  
SOUPAPE EVJ001 POSITION SWITCH-OPEN  
SOUPAPE EVJ001 POSITION SWITCH-CLOSE  
SOUPAPE EVJ002 POSITION SWITCH-OPEN  
SOUPAPE EVJ002 POSITION SWITCH-CLOSE  
ESPACE VIDE NON FONCTIONNEL  
ESPACE VIDE NON FONCTIONNEL  
ALARME TRES HAUT TEMPÉRATURE AMBIANT

---

<div class="post-metadata">

**Author:** ![UnborN](https://avatars.discourse-cdn.com/v4/letter/u/4491bb/32.png) [@UnborN](https://discourse.nodered.org/u/UnborN)\
**Post date:** [4 June 2022 18:56 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/5 "2022-06-04T18:56:37Z")

</div>

Hello ..

I see you use a Join node at the top part of your flow .. just to pass a topic? its not needed .. you can set your Modbus node option to keep msg properties and set any additional properties (like topic and selection) in the Function node.

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/2/d2e81064183358316374880c8771450dd800704e.png)

Also in the `Adressage` Function .. there is no need to loop through the array to reverse it.  
Just use the JS method [.reverse()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse)

**Modified Flow**

```auto
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```

* * *

your modbus device has a Holding register (FC3) to present its Digital (true/false) values ?  
how many Digital inputs/outputs does the device have ?  
you are reading 1 register each time. thats 16bits of 0s and 1s  
as @E1cid noted .. you are running out of elements in the array

---

<div class="post-metadata">

**Author:** ![Theodros](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/theodros/32/61068_2.png) [@Theodros](https://discourse.nodered.org/u/Theodros)\
**Post date:** [4 June 2022 20:36 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/6 "2022-06-04T20:36:36Z")

</div>

thanks for all this info I will see to apply it and yes I was checking what @E1cid was saying and I understood the problem. I need to understand how to retrieve the elements correctly in a bigger array (78 elements)

---

<div class="post-metadata">

**Author:** ![Theodros](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/theodros/32/61068_2.png) [@Theodros](https://discourse.nodered.org/u/Theodros)\
**Post date:** [4 June 2022 22:04 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/7 "2022-06-04T22:04:45Z")

</div>

So I changed my program and seperated the whole list in 5 array of 16 elements.

Now it works because everytime the list number returned is going from 0 to 16.

Thanks for everything guys

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [3 August 2022 22:05 UTC](https://discourse.nodered.org/t/value-considered-as-undefined/63447/8 "2022-08-03T22:05:19Z")

</div>

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