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Unable to read/write an array using UAIndexRangeList.OneDimension

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05 Dec 2023 15:31 #12451 by support
Thank you.
Unless you have an information pointing to the contrary, my conclusion is that the server does not support reading index ranges (which is a non-compliant behavior I think).

Regards

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05 Dec 2023 15:23 #12450 by Scaglioni

Hello.
thank you.

However, you have not answered my question 1), which reads "Do you have any other OPC UA client ....". You answered "....I tried on another server ....", which is not what I asked about. I wanted to know if you have tried another client with the SAME server. Can you answer that?

Ah ok. I tried only to access the array with UA Expert client but it reads the entire array. I don't have found a way to access a single element.

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05 Dec 2023 15:14 #12449 by support
Hello.
thank you.

However, you have not answered my question 1), which reads "Do you have any other OPC UA client ....". You answered "....I tried on another server ....", which is not what I asked about. I wanted to know if you have tried another client with the SAME server. Can you answer that?

Regarding question 2), note that parsing "1,2" gives two-dimensional range of indices and is therefore incorrect for your purpose; however, "1:2" represents a one-dimensional range and should work.

Regards

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05 Dec 2023 15:06 #12448 by Scaglioni

Hello.

Your code appears correct. It might be a server problem.

Questions:

1) Do you have any other OPC UA client that is capable of reading array ranges, and if so, have you tried doing the same with it, and what were the results?
2) What happens if you attempt to extract more than one element? E.g. UAIndexRangeList.OneDimension(1, 3)

Best regards

1) Yes, I tried on another server and I had the element I requested.

2) I tried to extract more elements with this code:

var err = UAIndexRangeList.TryParse("1,2", out list);
if (err != null)
MessageBox.Show(err.ToString());

var value = easyUAClient1.ReadValue(
new UAReadArguments(
this._descriptor,
nodeIdTextBox.Text, list)
);

Error received:

Status is not good: {BadIndexRangeInvalid}. The syntax of the index range parameter is invalid.
+ The index range list used was "[1, 2]".
+ The node descriptor used was: NodeId="ns=1;s=R1:D0[0..499]".
+ The client method called (or event/callback invoked) was 'ReadMultiple[1]'.

I tried with "1:2" and I reveived the same error:

Status is not good: {BadIndexRangeInvalid}. The syntax of the index range parameter is invalid.
+ The index range list used was "[1:2]".
+ The node descriptor used was: NodeId="ns=1;s=R1:D0[0..499]".
+ The client method called (or event/callback invoked) was 'ReadMultiple[1]'.

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03 Dec 2023 11:01 #12427 by support
Hello.

Your code appears correct. It might be a server problem.

Questions:

1) Do you have any other OPC UA client that is capable of reading array ranges, and if so, have you tried doing the same with it, and what were the results?
2) What happens if you attempt to extract more than one element? E.g. UAIndexRangeList.OneDimension(1, 3)

Best regards

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01 Dec 2023 16:29 #12422 by Scaglioni
Hello, I am unable to read/write array elements using indexing with GEFRA machines.
Here is the code I used to test the issue:

var value = easyUAClient1.ReadValue(
new UAReadArguments(
this._descriptor,
nodeIdTextBox.Text, UAIndexRangeList.OneDimension(1))
);

The error I received is:
'Opc.UA.ServiceResult=0x80360000/OPC UA service result - {BadIndexRangeInvalid}. The syntax of the index range parameter is invalid. [...]'

If I try to read/write the entire array, it works.
Example of code for reading the entire array:

var err = UAIndexRangeList.TryParse(string.Empty, out list);
if (err != null)
MessageBox.Show(err.ToString());
var value = easyUAClient1.ReadValue(
new UAReadArguments(
this._descriptor,
nodeIdTextBox.Text, list)
);

Is there something wrong with my code?.

This is the node I tried to read:



Thank you
Attachments:

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