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  9. Unable to read Array with KEPServer EX 6 and AB Logix

Unable to read Array with KEPServer EX 6 and AB Logix

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31 Mar 2024 10:47 #12705 by MaxDeVos
Replied by MaxDeVos on topic Unable to read Array with KEPServer EX 6 and AB Logix
The only way to read the whole array is by explicitly defining the length of the array and reading from zero, as though you were looking to select a subset of it. KEPServerEX seemingly does not have the ability to determine the array size.

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31 Mar 2024 08:00 #12704 by support
Replied by support on topic Unable to read Array with KEPServer EX 6 and AB Logix
Many thanks @MaxDeVos, this may be really helpful.

The OP has, however, searched for reading the whole array, while the syntaxes are mainly for extracting array elements. But there are also provisions for extracting a range of elements, so perhaps that can be used.

Thanks again

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30 Mar 2024 13:55 #12703 by MaxDeVos
Replied by MaxDeVos on topic Unable to read Array with KEPServer EX 6 and AB Logix

I selected GLOBAL and MyBoolArray tag isn't there. i tried to created it but it won't keep ''Boolean array'' as Data type... It changes It to Boolean as pictured

You have to use some bizarre KEP-specific syntax which is hidden away in the help menu of the KEPServerEX configuration client1. Said documentation, if you can find it at all, is fully concerned with arrays of 2 or more dimensions, which if I had to guess, represents <0.001% of use cases. I've consolidated the useful information into a table for you (and whoever else is in this situation in the future)

1 - I've found that the internal help menu is, far and away, the greatest resource that exists for KEPServerEX. It's riddled with typos and has tons of outright wrong information in it, but it's the most coherent collection of info that exists. You can access it at any time by pressing F1.
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The following user(s) said Thank You: support

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22 Mar 2024 20:05 - 22 Mar 2024 20:09 #12678 by support
Replied by support on topic Unable to read Array with KEPServer EX 6 and AB Logix
Hello.

I think there is a simple OPC client (interactive GUI) coming with KepServerEX. Can you make it work with it? If not, I think it would be safe to say it is not actually supported by Kepware.
If you can get it work with their client, please send screenshots that would allow me to understand how you reached that state - we certainly should be able to replicate it using our components as well, then.

Best regards
Last edit: 22 Mar 2024 20:09 by support.

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22 Mar 2024 14:59 #12674 by glwalsh
Replied by glwalsh on topic Unable to read Array with KEPServer EX 6 and AB Logix
I selected GLOBAL and MyBoolArray tag isn't there:

File Attachment:



i tried to created it but it won't keep ''Boolean array'' as Data type... It changes It to Boolean as pictured

File Attachment:

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22 Mar 2024 13:30 - 22 Mar 2024 13:31 #12673 by support
Replied by support on topic Unable to read Array with KEPServer EX 6 and AB Logix
Hello.

I am not sure if the OPC item (tag) name for the whole array actually is "Channel2.MyPLC.Global.MyBoolArray_x". This is the name for the OPC branch ("folder") holding the elements. It can also be the name for the whole array, but not necessarily.

Please do this:

Select KepServerEX configuration, in the tree on the left, select one level above what is on the screenshot - i.e., select the "Global" node. Post a screenshot of it if possible.

Then, have a look at the list in right pane of the window. Is something like MyBoolArray there? And what is its precise name?

Best regards
Last edit: 22 Mar 2024 13:31 by support.

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22 Mar 2024 13:18 #12672 by glwalsh
Unable to read Array with KEPServer EX 6 and AB Logix was created by glwalsh
Hello,

I'm unable to read an array of bool using ReadItemValue. I can read one value of the array at the time but can't read the full array.

According to the documentation it is supposed to work... Is this feature not supported with KEPServer?


My code

var client = new EasyDAClient();
bool[] value = (bool[])client.ReadItemValue("", "KEPware.KEPServerEx.V6", "Channel2.MyPLC.Global.MyBoolArray_x");


from KEPServer log :
Channel2.MyPLC | Unable to read tag. | Tag address = 'GLOBAL.MYBOOLARRAY_X', CIP error = 0X4, Extended error = 0000.


File Attachment:



Thanks !

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