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DataChange scan rate

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09 Mar 2015 10:01 #2950 by support
Replied by support on topic DataChange scan rate
Yes.
The following user(s) said Thank You: adid@contel.co.il

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08 Mar 2015 12:59 #2949 by adid@contel.co.il
hello,

so just want to make sure,
if the tag define in Kepware has 100 scan rate,
and i want to get every dataChange at least as fast as the kepware,
than the OpcLabs scan rate should be 50 ?

thank you,
Adi Damty

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04 Mar 2015 05:23 #2894 by support
Replied by support on topic DataChange scan rate
UPDATE/CORRECTION:

It is possible that the Kepware server uses the tag update rates configured within it only for non-OPC clients, and that it uses the rates specified by OPC clients when the tags are addressed through OPC. How this works is really something you need to figure out with the server vendor, Kepware in this case.

Best regards
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03 Mar 2015 19:31 - 03 Mar 2015 19:32 #2888 by support
Replied by support on topic DataChange scan rate
You start with the requirements of the application, and figure out the rate needed so that you receive the data as often as you need. This depends totally on the application, and you need to determine it yourself.

Some OPC servers will then take the update rate form the OPC client(s), and use it as the communication rate with the device. With such servers no further settings are needed, you just define the above determined rate as the update rate inside OPC.

Other servers (Kepware probably) scan the device independently from the update rates of any OPC clients. In such case, you should set the scan rate in the server to be at least as fast as what is required by the application, and then you typically set the OPC update rate to be twice as fast.
Last edit: 03 Mar 2015 19:32 by support.
The following user(s) said Thank You: adid@contel.co.il

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03 Mar 2015 15:55 #2885 by adid@contel.co.il
hello,

what is the prefferable scan rate for dataChange tag if the tag define in Kepware with scan rate 100 ?
i am not quite sure how i define this parameter i transfer when creating new dataChange event.


thank you,
Adi Damty

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