# OPC UA Client continues reading

**URL:** <https://discourse.nodered.org/t/opc-ua-client-continues-reading/74175>\
**Category:** General\
**Tags:** opcua\
**Created:** [25 January 2023 13:53 UTC](https://discourse.nodered.org/t/opc-ua-client-continues-reading/74175 "2023-01-25T13:53:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Kamal8393](https://avatars.discourse-cdn.com/v4/letter/k/71e660/32.png) [@Kamal8393](https://discourse.nodered.org/u/Kamal8393)\
**Post date:** [25 January 2023 13:53 UTC](https://discourse.nodered.org/t/opc-ua-client-continues-reading/74175/1 "2023-01-25T13:53:15Z")

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Hello,

I have OPC UA Client where I read two items as shown in the picture.

 ![Screenshot 2023-01-25 144859](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/4/9420531e6cc6051687fe9d68763a12e16d8ea7c9.png)

I have set the inject timer to 10ms interval, each 10ms, the node fetches the updated data. This is an issue for me as I will have continues request of data each 10ms, and not only when data has changed. Is there a way of implementing call-back method. By the way I am using a PLC as OPC UA server host.

Cheers,  
Kamal

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**Author:** ![mikakaraila](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikakaraila/32/37496_2.png) [@mikakaraila](https://discourse.nodered.org/u/mikakaraila)\
**Post date:** [2 February 2023 08:49 UTC](https://discourse.nodered.org/t/opc-ua-client-continues-reading/74175/2 "2023-02-02T08:49:59Z")

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OPC UA limits sample interval to 100ms.  
If you can store values to array and then update array with slower sample rate.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [3 April 2023 08:50 UTC](https://discourse.nodered.org/t/opc-ua-client-continues-reading/74175/3 "2023-04-03T08:50:11Z")

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