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Enterprise models
Obviously, the simplest topology is a single-system topology that contains every server (and
clusters of servers) in your plant.
Determine you security and business needs
When choosing your topology, you also have to take into account your security and business
needs. For example, if your system also includes level 3 and level 4 applications, or a firewall,
the optimal topology will be significantly different from a system that does not include such
items.
For more information, see the Network and Security Planning Guide.
Example enterprise models and topologies
The following topics contain example models and topologies that illustrate 'best practice'
design principles.
An asset model for a simple system
Scenario
Your plant includes milling, digestion and precipitation processes.
You want an asset model that accurately represents the three processes, identifies the main
plant items, and allows you to assign operators to specific processes.
In the case of the precipitation process, which requires more operator skill, you want to be
able to separately assign the thickener equipment to specific operators.
Solution
You design the asset model shown in the following figure.
An asterisk next to an asset indicates that it is assignable. Because Raw Materials, Digestion
and Precipitation are top level assets, they are assignable by default. Because, you want to
be able to assign the thickeners to specific operators, you also make Thickeners assignable.
With this design, you can assign either or both Precipitation and Thickeners to operators, as
appropriate. For example, if you only assign Precipitation to an operator, that operator will
have access to all assets below it, except for the Thickeners branch.
Honeywell 2017
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