Industrial IoT Technology Explained
From Sensors to Dashboard Without the Vendor Jargon. The critical knowledge operations and engineering teams need to evaluate vendors effectively.
The IIoT Stack
The five layers every deployment has.
Layer 1 — Perception (Sensors and Instruments)
The physical devices that measure something — temperature, vibration, pressure, flow. Industrial sensors differ from consumer ones via ingress protection (IP ratings), hazardous area certification, and operating temperature ranges.
Layer 2 — Connectivity
How data moves from sensors to processing. Wired vs wireless, short-range vs long-range. The protocol landscape: Modbus RTU/TCP, OPC-UA, PROFINET, EtherNet/IP, MQTT.
Layer 3 — Edge (Edge Computing)
Processing that happens at or near the data source before sending to cloud. Edge devices: industrial PCs, edge gateways.
Layer 4 — Platform (Cloud)
Where data is stored, contextualized, and made accessible. Historian vs time-series database vs data lake.
Layer 5 — Application
What users actually see and act on. Dashboards, reports, alerts, analytics.
Connectivity Deep Dive
The decision that determines everything else.
Wired Connectivity
Most reliable, highest bandwidth, hardest to retrofit. Ethernet, Modbus RTU, PROFIBUS.
Cellular (4G LTE / 5G)
Best for remote sites, mobile assets. Private 5G networks for large campuses emerging.
LoRaWAN
Long range (several km), very low power, low bandwidth. Best for widely distributed low-data assets.
WirelessHART
The dominant wireless standard for process instruments. Mesh network, self-healing.
OPC-UA
The protocol that changed industrial connectivity.
What OPC-UA is: an open, platform-independent, service-oriented architecture for industrial data exchange. The lingua franca of modern industrial connectivity.
Why it matters: before OPC-UA, connecting a Siemens PLC to a Rockwell system required custom drivers and was expensive. OPC-UA provides a vendor-neutral data model.
Information modeling: OPC-UA's most powerful feature — data isn't just values, it includes context (what the value means, its engineering units, its limits).