Cell/area zone
A term from the Converged Plantwide Ethernet (CPwE) design guides for one functional area of the plant floor, spanning Purdue Levels 0 through 2, where IACS devices exchange control traffic.
The network analogy
An access-layer block: one machine's or line's devices and switches, aggregated upward to the plant core.
Why it matters for wireless
The design guides recommend classifying availability requirements per cell/area zone. When a zone's control traffic crosses a radio, the radio inherits that classification, not the office WLAN's.
The Purdue model and the plant floor zones
Cell/area zones, where devices exchange control traffic, span Levels 0 to 2.
ISA-95 builds on the Purdue reference model with five levels, from the physical process at Level 0 to business planning at Level 4; the industrial DMZ between plant and enterprise is commonly called Level 3.5. NIST recommends firewall rules that keep Level 4 from reaching Levels 2, 1, and 0 directly. "Cell/area zone" comes from a jointly published vendor architecture, not a standard.
Sources: NIST SP 800-82r3, ISA-95, and a jointly published plantwide Ethernet design guide.
In the CPwE guides, the Industrial Zone includes Site Operations (Level 3) and multiple Cell/Area Zones (Levels 0 to 2)1, and the core aggregates all of the Cell/Area Zones. The guides recommend that each business determine the types of processes within each Cell/Area Zone and classify the availability requirements. NIST describes the same band of devices as the field level, typically Purdue levels 0, 1, and 22.
Cell/area zone comes from a jointly published vendor architecture, not from a standard. IEC 62443 uses its own zone and conduit model.
About this page
Built from 4 sources: 2 standards bodies and labs and 2 vendor documents. Researched and drafted with AI assistance, then reviewed and approved by Ben Rutter on . How pages are made
- First published
- Last updated
Cite this page
Plain
Ben Rutter. "Cell/area zone." OT Wireless, published October 5, 2026. https://otwireless.com/glossary/cell-area-zone/
APA 7
Rutter, B. (2026, October 5). Cell/area zone. OT Wireless. https://otwireless.com/glossary/cell-area-zone/
BibTeX
@misc{rutter2026cellareazone,
author = {Rutter, Ben},
title = {{Cell/area zone}},
year = {2026},
howpublished = {\url{https://otwireless.com/glossary/cell-area-zone/}},
organization = {OT Wireless},
}