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- QuickOPC-Classic in COM
- Reading, Writing, Subscriptions, Property Access
- Data exchange speed
Data exchange speed
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Regards
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Please check my post:
www.opclabs.com/forum/com-reading-writing-subscriptions-prop...cribing-to-a-non-existent-item
Is it truly safe to subscribe to a non-existent item?
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If you want to go your way, you do not have to subscribe to all of those items. One is enough. In fact, it can be ANY item on that server. Even more, it does not even have to any valid one.
Best regards
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The defaults are (in millseconds):
public const int DefaultItemDetach = 5 * 1000;
public const int DefaultServerDetach = 10 * 1000;
public const int DefaultTopicRead = 30 * 1000;
public const int DefaultTopicWrite = 30 * 1000;
Best regards
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Another question
when I write 10 tags, could you please estimate the "B" factor in the following relation
time_of ( 10x WriteItemValues ) = B * time_of ( WriteMultipleItemValues [10] )
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I forgot to subscribe to this topic, so I missed your reply unfortunately.
"if you do not use the server for some, QuickOPC will disconnect"
Could you please specify this time?
Where can I set the may need to increase the "hold period"?
thanks
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this is because most of the delay is not the actual data exchange, but a connection setup.
QuickOPC manages the connections (and disconnections) automatically, so you will see the first operation to any OPC server will take longer. Also, if you do not use the server for some, QuickOPC will disconnect and you will see the delay again.
If you are seeing it not just first time, but also later, you may need to increase the "hold period", so that QuickOPC keeps the connection open for longer time.
Any active subscriptions cause the connection be maintained open, until unsubscribed, too.
Best regards
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is that normal that the "EasyDAClient.ReadItemValue" and
"EasyDAClient.WriteItemValue" functions are extremely slow?
The first data exchange takes 400-600 ms.
Thanks.
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- Forum
- Discussions
- QuickOPC-Classic in COM
- Reading, Writing, Subscriptions, Property Access
- Data exchange speed