Does anyone have experience with application with many datapoint functions

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fmulder
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Joined: Wed Feb 03, 2010 8:46 am

Does anyone have experience with application with many datapoint functions

Post by fmulder » Thu Aug 08, 2019 9:58 am

We are facing an application that will probably have 150.000 physical I/O values being read by a bunch of PLC's. Eventually all these values will end up on a scada screen.
We will need to optimize the communication to the PLC so that we reach the desired update times.

Our PLC (1500 series) will be using the S7+ protocol. This means that we have the following options to reach an optimal communication response:

* Use subscriptions
* 'Pack' the bits into (d)words and use dp functions to extract the bits from the word into dp elements

Does anyone have experience with a WinCC Oa database, running on one server, with (lets say) 200.000 dp functions ?? (Please note that only a low amount of signals will actually change. I'd expect a small amount of changes per second. We have smoothing and time-delays in the PLC's)

Thanks for your answer

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Frenk Mulder

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leoknipp
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Joined: Tue Aug 24, 2010 5:28 pm

Re: Does anyone have experience with application with many datapoint functions

Post by leoknipp » Thu Aug 08, 2019 1:32 pm

A dp function itself is similar to a dpConnect.
As long as the input signals are not changing they are not causing any load. A high number of dp functions will only increase the memory usage of the Event Manager.

Best Regards
Leopold Knipp
Senior Support Specialist

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