01Retrofit, not replace
The control that's running today usually works. The gap is visibility and intelligence. A retrofit reads the same signals the PLC sees, adds analytics and connectivity, and leaves the safety and control loop untouched — so you modernize without re-validating what already passes.
02The edge-node pattern
One Pi/MCU node per machine or cell: it taps I/O and fieldbus, runs models locally (no cloud round-trip for control), and publishes results upward over MQTT/OPC-UA. Compute lives at the edge for latency and resilience; the cloud is for dashboards and fleet management.
03Where the value lands
Predictive maintenance (catch failures days ahead), OEE monitoring (measure availability/performance/quality), protocol gateways (bridge brownfield to the cloud), and lightweight SCADA — each a focused retrofit that pays back fast on a node that costs a fraction of a control upgrade.
Common questions
The ones we're asked on every first call.
It's designed not to. The edge node reads in parallel and doesn't sit in the control or safety path, so it installs beside live equipment with no scheduled downtime in most cases.
No — that's the point of a retrofit. The Pi node bridges your existing PLC/RTU to modern dashboards and analytics, so you get the Industry 4.0 benefits without the capital cost of new control.
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