IIoT Data Budget

Estimate bandwidth and storage from tag count, sampling interval and retention, and see what report-by-exception saves.

Runs in your browser, sends no databandwidth · storage

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Payload per value is the value plus its timestamp and quality; the message overhead covers the topic name and MQTT/TCP headers. These are estimates: the real size depends on your payload format (JSON, Sparkplug/Protobuf) and topic length. The default “reduction” is a value to try, not a recommendation.

Result
MeasureIf every sample is sentWith report-by-exception

    How is it calculated?

    • Value rate = number of tags ÷ sampling interval (values/s).
    • Message size = (tags per message × payload per value) + message overhead.
    • Message rate = value rate ÷ tags per message; bandwidth = message rate × message size × 8.
    • Daily volume = bandwidth × 86,400 s; storage = daily volume × retention ÷ compression ratio.

    The “report-by-exception” column assumes that only the stated percentage of values is not sent (those suppressed by deadband or on-change filtering). The real saving depends on the process, the filter threshold and how the signal behaves; there is no fixed figure, so the default is only a starting point to experiment with. A larger number of tags per message spreads the overhead over more values, but the message size must stay within the limits of the broker and the network.

    Frequently asked questions

    How close are these figures to real network traffic?

    It is an estimate. TCP and TLS headers, retransmissions, MQTT QoS acknowledgements and the payload format all change real traffic. Treat it as a planning figure and compare it with measurements during the pilot.

    What difference does report-by-exception make?

    Sending only meaningful changes can cut traffic and storage clearly for slowly changing signals (temperature, level); the saving drops for fast-changing signals. Set the filter threshold (deadband) with process knowledge.

    Are the values I enter stored?

    No, the calculation runs entirely in your browser.

    Related: Store-and-Forward · Deadband · Edge Computing · Edge or Cloud? Industrial Data Architecture Decisions

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