Change value: 1 to true

General
1

good night i am new to this program and i find it very interesting i am learning from the good going to the problem and connected a nano plc and i want to activate the output the registry votes me a value 1 but i want to change that to true to be able to activate the output that solution could have here. Thank you.

in this graph the value is shown

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In this other graph the value that it reads from msg to change it to true or false but without good result

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and in the latter what I wrote in the function to be able to have the value

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Thank you in advance for your help

2

your change node is not working because you are looking for the 0 in the wrong place. You’re msg.payload is an object. instead of payload put the path to the value key that you already have in the function into your change node:

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3

Also if you are dealing with numbers rather than strings (which I think you are) then you should test for equals 0 rather then search for 0.

5

With this flow works well the output of the plc is activated
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Taking as reference this flow that works correctly I try to do the same with the block of ubidots with which I have no results with the first flow it works well for me (MQTT) but with the second it does not respond there are no changes in the plc I already did the indicated for you but without improvement

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6

Have a play with this. You don’t need the function but just one change node:

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[{"id":"2652ecbf.ebc88c","type":"inject","z":"20693e98.c7fb2a","name":"","topic":"","payload":"{\"pulse_2\":{\"value\":0}}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":260,"y":820,"wires":[["b9a390ee.5e7d98"]]},{"id":"5f063935.ddf168","type":"inject","z":"20693e98.c7fb2a","name":"","topic":"","payload":"{\"pulse_2\":{\"value\":1}}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":260,"y":900,"wires":[["b9a390ee.5e7d98"]]},{"id":"b9a390ee.5e7d98","type":"change","z":"20693e98.c7fb2a","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.pulse_2.value","tot":"msg"},{"t":"change","p":"payload","pt":"msg","from":"0","fromt":"num","to":"false","tot":"bool"},{"t":"change","p":"payload","pt":"msg","from":"1","fromt":"num","to":"true","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":480,"y":860,"wires":[["c912584d.a2b9f"]]},{"id":"c912584d.a2b9f","type":"debug","z":"20693e98.c7fb2a","name":"true/false?","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":670,"y":860,"wires":[]}]

if you would want to do it in a function it would only be the function instead of the change node:

msg.payload = (msg.payload.pulse_2.value === 0) ? false : true; 
return msg;

and no change node at all.

1 Like
7

Thanks JGKK in both ways I work excellent the node thank you very much for your support.

8

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