IIoT, SCADA & Edge Connectivity worked example

Protocol Conversion Cost at 58% clean-conversion rate: a worked example

Suppose clean-conversion rate falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate the loaded cost of legacy protocol conversion (Modbus, DNP3, BACnet, serial) to OPC UA or MQTT from the count of devices to convert, conversion cost per device (gateway hardware plus engineering), the share that converts cleanly without driver custom work, and a fixed program engineering adder.

The inputs for this scenario

  • Legacy devices to convert: 60 devices (held at the documented default)
  • Conversion cost per device: 600 $ / device (held at the documented default)
  • Clean-conversion rate: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed program engineering adder: 18,000 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable protocol conversion cost = devices × cost per device × clean-conversion rate.
  • Total protocol conversion cost works out to 38,880 $ at these inputs, and this is the headline figure for the scenario.
  • Conversion cost per device works out to 648 $ / piece at these inputs.
  • Variable protocol conversion cost works out to 20,880 $ at these inputs.
  • Fixed program engineering adder works out to 18,000 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where clean-conversion rate sits at 80% and the headline result is 46,800 $, this scenario comes in 16.92% below the baseline at 38,880 $.
  • It computes total protocol conversion cost by applying a clean-conversion success rate to per-device cost, then adding a fixed engineering program charge. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total protocol conversion cost: 38,880 $ (headline result)
  • Conversion cost per device: 648 $ / piece
  • Variable protocol conversion cost: 20,880 $
  • Fixed program engineering adder: 18,000 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Protocol Conversion Cost calculator, set clean-conversion rate to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.