IIoT, SCADA & Edge Connectivity calculator

Edge Gateway Coverage Calculator

Estimate how much of the in-scope plant fleet is connected through edge gateways. Enter the count of assets currently connected through gateways, the total assets in the rollout scope, and the program coverage target. The calculator returns the coverage percent and the gap to target.

What this calculator does

  • Estimate the share of plant assets covered by deployed edge gateways from the count of assets connected through edge gateways, total assets in scope, and the program coverage target.
  • Use it when an automation lead is reporting IIoT rollout progress to operations and needs a clean percent-coverage number plus the gap to the target on the rollout dashboard.
  • It returns the share of in-scope plant assets connected through deployed edge gateways and the gap to the rollout target.

Formula used

  • Edge gateway coverage = connected assets ÷ total in-scope assets × 100
  • Coverage gap to target = target coverage - actual coverage (negative gap means below target)

Inputs explained

  • Assets connected through edge gateways: Use the count of PLCs, machines, or skids actually publishing data through a deployed edge gateway.
  • Total in-scope assets: Use the count of assets in the rollout scope from the asset register (do not include assets that are explicitly out of scope).
  • Edge gateway coverage target: Use the program coverage target by milestone (typical 60 percent at year 1, 90 percent at year 2, and 100 percent at full rollout).

How to use the result

  • Run it weekly during an IIoT rollout, before the operations review, or when the steering committee asks for evidence the deployment plan is on track.
  • Coverage does not equal data quality. A gateway can be deployed but reporting stale or partial tags; pair with the OT data completeness and machine data capture rate calculators for a quality view.

Common questions

  • What counts as connected? An asset is connected when its PLC, RTU, or sensor is publishing tags through a deployed edge gateway and the data is landing in the historian or broker. Assets cabled but not yet publishing should not be counted.
  • Should I count out-of-scope assets in the denominator? No. Use only the assets the rollout is targeting. Putting non-scope assets in the denominator makes the coverage number meaningless.
  • Why the difference between coverage and connectivity rate? Edge gateway coverage looks at which assets have a gateway in front of them. Machine connectivity rate (separate calculator) looks at the share of machines actively publishing data right now.
  • What target should I use for a brownfield site? Brownfield sites usually start at 30 to 50 percent coverage in year 1 and reach 80 to 95 percent by year 3. Greenfield sites can target 100 percent from launch.

Last reviewed 2026-05-12.