industrial//industrial data layer//deadband

A threshold under which a change is not worth reporting: while a value stays within the band around the last recorded sample, no new sample or event is generated; when it crosses the threshold, one is. The small graph with a threshold line in any historian manual is exactly this.

A threshold under which a change is not worth reporting: while a value stays within the band around the last recorded sample, no new sample or event is generated; when it crosses the threshold, one is. The small graph with a threshold line in any historian manual is exactly this.

It reduces three things at once: traffic on the network, storage in the historian, and noise in the data. It is the reason a historian can keep years of a signal that changes by a thousandth of a degree.

The same idea appears on the wire as report by exception (a device sends only when something changed) and in OPC UA subscriptions as a deadband filter. The trade-off is fidelity: a band set too wide erases the small oscillation a diagnostic later needed.