Use of ST Expressions in Graphic Language
"Integrated development environment"
An integrated development environment is a type of computer software that assists computer programmers in developing software.
IDEs normally consist of a source code editor, a compiler and/or interpreter, build-automation tools, and a debugger enables any complex ST "Structured text"
A high-level language that is block structured and syntactically resembles Pascal expression to be associated with a graphic element in either FFLD or FBD "Function block diagram"
A function block diagram describes a function between input variables and output variables. A function is described as a set of elementary blocks language.
- This feature makes it possible to simplify FFLD and FBD diagrams when a trivial calculation has to be entered.
- It also enables you to use graphic features for representing a main algorithm as text is used for details of implementation.
- Expression must be written in Structured Text (ST) language.
- An expression is anything you can imagine between parentheses in an ST program.
- The ST expression must fit the data type required by the diagram (e.g., an expression put on a contact must be Boolean).
FBD language
A complex ST expression can be entered in any variable box of a FBD diagram, if the box is not connected on its input.
FFLD language
A complex ST expression can be entered on any kind of contact, and on any input of a function or function block.
