4. NodeRed with analog OUTput

NodeRed with analog OUTput

  • B

    I have found trouble with nodered "UniPi output" block in connection with Analog Output mode.

    I use Analog Output 1.01 with Current configuration, where sending 4-20mA to the valve. But in "UniPi output" block we see the limits:

    Details for the Analog output input msg:
    Number - in the interval <0;10> returns the input number, <0 returns 0, >10 returns 10.

    So, when I send a 20mA to fully open a valve, this valve received only 10mA, because your module has limits.

    How can I fix that?

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    Z
     1 Reply
  • Z

    Hello @beergeek

    You are right with problem when using analog output in configuration 0-20mA. When we designed nodes, we only implemented voltage output.

    To fast repair you can add function node to output, that recalculate output value from 0-10 to 0-20. So your input value will be 0 to 10, but output value will be 0-20. We will try to repair output node with support for current output it in next week.

    Function code to fast implementation:
    0_1562793741763_b5537379-d362-4d19-b00b-00d50f3b5464-image.png

    Try to import funtion and connect it as in picture.

    [{"id":"98b4db11.a43aa8","type":"function","z":"dd6bd412.3bde08","name":"0-20mA","func":"if(msg.payload.value) \n{\n    msg.payload.value = msg.payload.value*2.00;\n}\nreturn msg;","outputs":1,"noerr":0,"x":1260,"y":220,"wires":[["a7851ed2.a7d6"]]}]

    Thank you for your notice.

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