OTWatch laboratory protocol
Synthetic cold-storage OT fixture. Eight aliased assets per plant. No live PLC.
Streams
process: zone temperature, freezer temperature, compressor Hz, suction pressure, humidity, door, defrost.network: normalized Modbus-like frames (read_holding,read_input,write_single,write_multiple,read_id).
Gold
process_fault: sensor stuck/drift, allowlisted communication.maintenance: scheduled defrost plus engineering writes.needs_review_unauth_write: write from an unknown host.needs_review_unauth_scan: unusual function codes from an unknown host.unknown_cause: process drift overlapping unexpected reads.
Process anomaly is not a cyber attribution. A process model alone does not prove a cyber origin.