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10:28, EEST
October 17, 2016
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Hi,
My server is the opc-ua server siemens S7. In order to communicate with the server I am using prosysopc java sdk. The connection is working fine. I have set the samplinginterval=0.0 and QueueSize=100000, but I am surprised to see that samplingInterval=100.0 (monitoredItem.getSamplingInterval()) and QueueSize=1000 (monitoredItem.getQueueSite()) when I print out this parameters from my onDataChange method.
Any idea why my settings is not working?
Owen
11:08, EEST
December 21, 2011
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The server may revise the values according to what it is capable in practice. So you will find the revised values after the items are created in the server.
11:21, EEST
October 17, 2016
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thank your for your reply, but I have no idea how I can find the revised values. I am newbe in this area
11:37, EEST
December 21, 2011
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The values you see at DataChange (100.0 and 1000) are the revised values.
12:02, EEST
October 17, 2016
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Thank you for your reply! Apparently I have no chance to set the samplingInterval 1000.
13:02, EEST
December 21, 2011
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You requested SamplingInterval 0.0, which means “use the fastest possible” and the server revised it to 100.0, informing you of the actual interval it will use. Note also that typically, the SamplingInterval equals to PublishingInterval of the subscription. In this case, SamplingInterval can be set to -1 (or any negative value). You should be able to set the SamplingInterval to higher than 100.0, at least as high as the PublishingInterval of the subscription. (Even higher than PublishingInterval is specified to be possible, but the JavaSDK for example, does not support that in practice at the moment)
The server probably wants to limit the queueSize to 1000 to conserve its resource consumption.
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