Writing data with node-opcua about node-opcua HOT 4 CLOSED

Dear Diti24,

I could successfully write data to OPC Server with writeSingleNode method. The problem is write data is not just simple as value =0 . It must have value and data type properties. For example:

dataToWrite = {
   dataType: "Int16",
   value: 0
}

Best Regards,
Tin Dao

from node-opcua.

Ok,
this was the trick :-).
I didn't found this info before.
Thanks

Dear Diti24,

I could successfully write data to OPC Server with writeSingleNode method. The problem is write data is not just simple as value =0 . It must have value and data type properties. For example:
dataToWrite = {
dataType: Int16,
value: 0
}

Best Regards,
Tin Dao

---

Reply to this email directly or view it on GitHub:
#28 (comment)

from node-opcua.

Hi,

I want to ask is it possible now to write a variable which ArrayDimensions is bigger than 1 (In my case, 256). I try

var  dataToWrite = {
   dataType: "Double",
   value: [1.2,1.2,1.2]
}
var value = 0;
the_session.writeSingleNode ("ns=3;s=MEM_09/2:CalSampleRate",dataToWrite, function(err,statusCode,diagnosticInfo) {
  if (!err) {
    console.log(" write ok" );
  } else {
    console.log(" write err = " ,err);
  }
  callback(err);

But it does not work.

Thanks,

Yiqing

from node-opcua.

Hi yping:
dataType shall be a DataType enum,
you probably need to specify the arrayType

var  dataToWrite = {
   dataType: opcua.DataType.Double,
   arrayType: opcua.VariantArrayType.Array
   value: [1.2,1.2,1.2]
}

from node-opcua.