IIoT, SCADA & Edge Connectivity worked example

Edge Device Count at 98% deployment uptime headroom: a worked example

Push deployment uptime headroom up to 98% and the picture changes. This example computes every intermediate figure at that operating point. Use it when an IIoT program lead is sizing the total edge device order across a multi-site rollout, before placing the hardware PO.

The inputs for this scenario

  • Sites in scope: 24 sites (unchanged)
  • Edge devices per site: 3 devices / site (unchanged)
  • Deployment uptime headroom: 98 % (raised for this scenario; the documented default is 85)
  • Clean-install rate: 95 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross edge devices needed = sites × devices per site) to the inputs above produces each figure below.
  • At this operating point the engine returns 67.03 devices for edge devices landing cleanly in plan, the number this scenario is built around.
  • At this operating point the engine returns 72 devices for gross edge devices needed.
  • At this operating point the engine returns 1.44 devices for deployment downtime loss.
  • At this operating point the engine returns 3.53 devices for replacement loss from doa or damage.

How this compares with the baseline

  • Against the tool's baseline example, where deployment uptime headroom sits at 85% and the headline result is 58.14 devices, this scenario comes in 15.29% above the baseline at 67.03 devices.
  • It computes gross edge devices as sites times devices per site, then the count landing cleanly after applying deployment uptime headroom and clean-install rate, and breaks out each loss. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Edge devices landing cleanly in plan: 67.03 devices (headline result)
  • Gross edge devices needed: 72 devices
  • Deployment downtime loss: 1.44 devices
  • Replacement loss from DOA or damage: 3.53 devices

Run it with your numbers

  • Every input above is editable in the live Edge Device Count calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.