Episode 03 — Zones and conduits for a smaller factory
Reference check: 6 November 2026

NIST SP 800-82 Revision 3, Guide to Operational Technology (OT) Security, September 2023.
https://csrc.nist.gov/pubs/sp/800/82/r3/final
https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-82r3.pdf
Relevant context: section 5.2.3, network segmentation and isolation; printed pages 71–73.
Supports the use of functional models and mapped communications when developing segmentation, with operational, performance and safety considerations.

ANSI/ISA-62443-3-2-2020, public ISA preview.
https://www.isa.org/getmedia/661c718f-8e64-446d-acf9-2c6286db1b33/isa-62443-3-2-preview.pdf
Relevant context: scope, printed page 13; conduit definition, printed page 14.
Supports defining the system, partitioning zones and conduits, risk assessment, target security levels and documenting requirements. Consult the licensed applicable standard for normative requirements.

The packaging-line example, identifiers, communication register prompts and workshop sequence are original illustrative teaching material. They do not describe a customer installation, prescribe a firewall rule set, or constitute a completed risk or safety assessment. Purdue levels are shown as simplified functional context, not as assigned security levels or mandatory zone boundaries.
