Comparisons
Comparisons
Section titled “Comparisons”Comparison pages are support pages, not the starting point. The right use for this section is to pressure-test an architecture after the line problem, site conditions, support model, and device boundary are already defined.
Core paths
Section titled “Core paths” Selection workflow Use a disciplined workflow after the plant has already defined the operating problem, acceptance evidence, and support expectations.
Brownfield data acceptance criteria before scaling Prove line states, events, timestamps, buffering, and ownership before expanding machine data collection across more assets.
PLC data quality audit before OEE, MES, and AI Audit tag meaning, line-state logic, timestamps, counters, alarms, stale data, and ownership before scaling PLC data into higher systems.
Internet-facing PLC risk before IIoT data collection Remove unsafe PLC, router, and remote access exposure before adding gateways, historians, MQTT brokers, or industrial AI data paths.
PLC timestamps, clock sync, and event order Decide whether PLC, gateway, historian, or application timestamps can be trusted for downtime, MES records, alarms, and AI features.
MQTT broker vs edge buffer Compare publish architecture choices only after the brownfield collection boundary is already stable.
Sparkplug vs plain MQTT Use this when the plant is moving toward shared semantics and needs to know whether plain MQTT still fits.
OPC UA FX, MQTT, and Sparkplug boundaries Place OPC UA FX, OPC UA, MQTT, Sparkplug, and legacy protocol access at the right architecture layers.
Historian tags vs event models Use this when broad tag collection still fails to answer operating questions cleanly.
PLC tag naming and context mapping Use this before scaling historian, OEE, or industrial AI work from raw PLC tags into shared operating meaning.
Polling rates vs event triggers Use this when brownfield collection economics are drifting because the site is polling too much, triggering too little, or using the wrong split.
Tag growth vs modeled events Use this when historian expansion keeps growing but the plant still lacks clean operating meaning and useful economics.
SCADA vs MES vs a lightweight operations layer Use this when the plant knows it needs better visibility but is still deciding how much software architecture it truly needs next.
Gateway vs edge computer Decide whether the project really needs local software or still needs cleaner data collection.
Vendor portfolio analysis Use vendor review inputs inside the shortlist, rather than as a substitute for it.
Protocol fit Ensure protocol assumptions are already pressure-tested before products are compared.
How to use comparisons well
Section titled “How to use comparisons well”- Lock the application and operating problem first.
- Define the device boundary and support owner before narrowing products.
- Use comparison pages to remove weak fits, not to create architecture from scratch.
- Finish by re-checking lifecycle burden, maintenance reality, and rollout simplicity.