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内容简介：PI Module Database
Nick D’Orazio
OSI Software Training Coordinator
PI Module Database Overview
Integrated into PI version 3.3, released April 2001
Scalable, secure databases
Provides structure at the server level for organizing plant information
Databases offer access to the PI time series databases:
PI Data Archive
PI Batch Database
What is a PI Module?
The manual says:
"A standardized, often interchangeable component of a system or construction that is designed for easy assembly or flexible use."
What?
What is a PI Module?
Standardized
Every instance of the module has the same Methods and Properties.
Interchangeable
Each module can represent many different things.
Every instance of the module can be used in more than one place.
Component
Each module is a Hierarchical Collection.
Easy assembly or flexible use
Programmatic access from any programming language.
A suite of ActiveX controls will provide standard access. (coming with client tools version 3.0 and higher)
What is a PI Module?
Why is the PI Module Database Unique?
Configuration – It stores Modules in a hierarchal format, like Windows Explorer.
Presentation – The user sees the data in context of the application.
Why is the PI Module Database Unique?
Broadens PI Server functionality by supporting,
Association of PI points with modules, Aliases.
Why is the PI Module Database Unique?
Broadens PI Server functionality by supporting,
Storage of related attributes, Properties.
Why is the PI Module Database Unique? Historization versus Revisions
Historization is reserved for major events
Addition of new equipment
Equipment upgrades
Revisions are reserved for minor events
Adding a new property or alias
Modifying an existing property value
The user determines when to historize the information.
Why is the PI Module Database Unique? Historization versus Revisions
Why is the PI Module Database Unique? Historization versus Revisions
How would you handle a situation like this in the past?
Forget about the older data?
Write code to associate the past data to the new data?
The PI Module Database allows you to dynamically make an association to all related data, regardless of changes that occur.
Practical use of Historizing a Module
An Application that Use Module History
Practical Applications
The “Old Way” of Visualizing PI Data
Create PI tags for each site
Develop multiple PI ProcessBooks representing each Division
Tabs in each PI ProcessBook to represent different locations
Build individual PI ProcessBook displays for each area, and/or equipment class
Result:
Client based views
Many PI ProcessBooks
Many individual displays
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