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Kepware Knowledge Base: Solution

Slow OPC XML-DA Client Driver Communications

Last Update: 11/7/2018

With OPC XML-DA, a typical group of tag reads can take from 1 to 3 seconds. The maximum number of tags in a single request is 512. So, if the OPC XML-DA Client driver is configured to read few thousand tags, it could take several seconds to a minute to complete a single poll cycle.

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