REPLIL interactive Purdue reference architecture

INTERACTIVE REFERENCE ARCHITECTURE

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CONTENT SOURCESOutside the plant network
LEVELS 4–5Enterprise & central services
DATA DIODEOne-way boundary conduits
LEVEL 3.5Industrial DMZ / controlled boundary
LEVEL 3Site operations & isolated testing
LEVEL 2 / CELL ZONESupervisory & standalone systems
LEVEL 1Basic control
LEVEL 0Physical process
ContentAccess / identityPosture / logsCMC management / IPM optionalMFA badge: supported access, configured per deploymentDiscovery / trafficVault / rotationOffline / local exchange

Synchronization requests and monitoring arrows point upstream, from lower to higher Purdue levels. The separate Enterprise-to-OT content-delivery path uses HTTPS when connected or manual external-media import; it does not represent HTTPS passing through a one-way diode. CMC management paths are shown separately; the direct IPM management path is optional. Choose the content transfer option to compare HTTPS delivery with manual external-media updates. Illustrative placement, not a universal deployment blueprint. Security zones, approved conduits, protocol choices, and offline-transfer procedures depend on the site design. Level 0–1 context does not imply direct automated PLC patching or controller certification. Purdue layer reference ↗

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