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Section 1 Libraries
Introduction
The libraries used in the control project must have a consistent appearance. The
names of libraries, object types, data types, parameters, and variables must be used
consistently. In addition to this, there must be well-defined color schemes, and a
standard methodology for user interaction on the interface.
This manual is a style guide for developing libraries, data types, Control Module
Types (CM) and Function Block types (FB) and Diagram types. The corresponding
internal code for CM and FB is created with the programming language - Structured
Text (ST). The suggestions regarding FB in Function Block Diagrams (FBD) are
also applicable to Ladder Diagrams (LD).
Purpose
The recommendations provided in this manual apply to libraries, objects and data
types, and not to hardware types.
This style guide helps in:
• Creating a compact graphic representation of object types, which facilitates
efficient use of screen area and paper.
• Using consistent and clear naming of libraries, object types, data types,
parameters, and variables, which complies with the existing standards.
• Creating object types with consistent engineering interface.
• Developing a code structure that is easy to understand.
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