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Kepware Knowledge Base: Solution


Data Change Events with Multiple Tags in a Group


Last Update: 2018/11/7

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
KEPServerEX

Related Protocols
OPC Data Access (DA)