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Influence of OPC UA communication on cycle time

2/17/2023 4:47 PM	Rate (0)
ahi_77 Experienced Member Joined: 10/23/2015 Last visit: 8/15/2025 Posts: 168 Rating: (2)	Hi every one, I would like to use a S1517 as a UPC UA server to communcate with a C# app .... And i want to know if the OPC UA communication has an influence on the cycle time of my PLC Thanks every one
	Last edited by: ahi_77 at: 02/17/2023 16:50:09
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2/19/2023 7:27 PM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 9/12/2025 Posts: 4108 Rating: (634)	Hi ahi_77, yes, OPC UA - like any other communication - has an impact on the PLC load and therefore on the cycle time. Take a look at the following FAQs: What are the system limits of the OPC UA Server with S7-1500 and S7-1200? How can you optimize the performance of the OPC UA server of a SIMATIC S7-1500 and reduce the load on the server? How do you best configure an OPC UA client to communicate efficiently with the OPC UA server of a SIMATIC S7-1500 CPU and with the best performance possible? Kind regards Stefan

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2/20/2023 8:30 AM	Rate (0)
ahi_77 Experienced Member Joined: 10/23/2015 Last visit: 8/15/2025 Posts: 168 Rating: (2)	Hi Stephan , Thanks for your answer, but i really can not find the information that i need... How time it's take to read 10000 tag for example BR
	Last edited by: ahi_77 at: 02/20/2023 10:06:45
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2/20/2023 1:23 PM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 9/12/2025 Posts: 4108 Rating: (634)	Hi ahi_77, if you are using 10,000 tags, you are at the maximum for one subscription and at the recommended maximum total number of tags. Overall performance depends on many parameters, not just the number of tags. So it is unlikely that you will find a specific answer to your question. You may need to test this for your specific purpose. Kind regards Stefan

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