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  7. Schreiben/Lesen von Tagswert dauert lang

Schreiben/Lesen von Tagswert dauert lang

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02 Mar 2020 14:36 #8257 by tmouslih
Replied by tmouslih on topic Schreiben/Lesen von Tagswert dauert lang
Hello,

Thanks for the quick replay and for the suggestion.
But do you know what can be the cause that reading or writing of only one item value take about 100ms?

Many thanks

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02 Mar 2020 14:17 - 02 Mar 2020 14:18 #8256 by support
Replied by support on topic Schreiben/Lesen von Tagswert dauert lang
Hello.

first thing to optimize is here is to replace replace repeated calls to ReadItem/ReadItemValue by a single call to ReadMultipleItems/ReadMultipleItemValues (or at least a couple of calls to ReadMultipleItems/ReadMultipleItemValues with as much as possible large number of items in each of them).

Best regards
Last edit: 02 Mar 2020 14:18 by support.

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02 Mar 2020 11:52 #8254 by tmouslih
Schreiben/Lesen von Tagswert dauert lang was created by tmouslih
Hallo,

Wir benutzen OPC Classic mit absoluter Adressierung und haben das Problem dass das Lesen und Schreiben von Tags relativ lang dauert. Allein beim Starten der Applikation dauert es bis 5 Minuten bis alle Tages initialisiert und gelesen werden.
Das Lesen von 160 Tags dauert etwa 3 Minuten (von 07:07:47.016 bis 07:10:26.064). Bitte Sehen Sie das Logfile im Anhang.

Ist Ihnen so einen ähnlichen Fall bekannt?
Was können die Ursachen sein?
Wie kann man das Lesen/Schreiben von Tag-Werten optimal beschleunigen?

Ich würde Ihnen sehr dankbar wenn Sie umgehend meine Fragen beantworten könnten.

Vielen Dank im Voraus.
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