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Kepware Knowledge Base: Solution

Data Change Events with Multiple Tags in a Group

Last Update: 11/7/2018

The Data Change Event occurs when the server polls a device and the value it returns is different from the value that was returned previously. For example, if the server requested 20 items and they all changed, users would see one Data Change Event with all the items. If the driver protocol only allows one item to be requested at a time, then only one data change will be returned for each item.

Related Products

Related Protocols
OPC Data Access (DA)