Symbols are needed to simplify the process of drawing the schematic. They contain a multitude of information such as graphical elements, connecting points, the assignment to a symbol group, the logic, etc. The relationship between a symbol and a function can appear as follows:
- The symbol does not represent a function, such as an angle or a T-node.
- The symbol represents a function, such as an NO contact or an NC contact.
- The symbol represents multiple functions, such as a motor overload switch or a triple fuse.
- The symbol represents part of a function, such as a device connection point or a change-over contact hook.
The symbol libraries are used to manage the symbols. A symbol library can contain an unlimited number of symbols. When editing a symbol only the changed symbol is opened and saved, not the entire symbol library. This minimizes the problems that could arise when multiple users are working in one library simultaneously.
See also