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OPC Data Client subscriptions keep looping/repeating

Why does the "ItemChanged" event keep firing, although the values within the PLC/Device are unchanging? In this particular case I am expecting the event to fire just once!

We have seen this problem when using RSLinx OPC Server, and in particular when RSLinx Monitor is running in the background. Simple shutting down the RSLinx Monitor cleared the problem so the "ItemChanged" event would now fire just once, as expected.