# OPC-UA server, controllogix and read whole array

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-server-controllogix-and-read-whole-array/11423>\
**Category:** Archived Topics\
**Created:** [March 28, 2016, 10:35am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-controllogix-and-read-whole-array/11423 "2016-03-28T10:35:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aFlex](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@aFlex](https://forum.inductiveautomation.com/u/aFlex)\
**Post date:** [March 28, 2016, 10:35am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-controllogix-and-read-whole-array/11423/1 "2016-03-28T10:35:30Z")

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Hello,  
I’m using the 7.8 ignition OPC-UA server with a controllogix with firmware version 28, as language to communicate with the server python with this library ( [github.com/FreeOpcUa/python-opcua](https://github.com/FreeOpcUa/python-opcua) ) .  
However I can’t manage how to read whole arrays or matrix, I CANNOT perform a single read for every value!

Also on the web opc client integrated I cannot get the whole matrix, only single values.  
Is this a limititation of the opc ua server?

( when using bosch mlc 75 opc server I can read and write whole array and matrix! )

Any hints or tips?

Thanks!

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [March 28, 2016, 3:00pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-controllogix-and-read-whole-array/11423/2 "2016-03-28T15:00:10Z")

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None of the drivers support arrays. You’ll notice that all elements of arrays belong to folders instead.

You can issue a single read call for all the elements and the driver will only make one request for all those elements, you just can’t access it as an array type.