It really depends on which FP Network Module.
Here is some info on how Fieldpoint OPC Server works:
Serial (includes FP-10xx series)
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No Deadbanding at all.
Poll rate (Either Update Rate Setup with the OPC subscriptions or the Advise Rate (default) in FieldPoint Explorer channel configuration.
Ethernet (includes FP-16xx and FP-20xx)
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Deadband and Update Rate both work.
However, Update rate is the Maximum Rate that data will be updated. For example if I have a Deadband = 0 and my data is changing every 1 second, and I choose my Update rate = 10 seconds. I will get new data exactly once per 10 seconds.
Joji