Declaration Editor In the declaration editor, you declare variables in variable lists and POUs. If the declaration editor is used with an implementation language editor , then is opens in a view above

Common Functions in Graphical Editors The implementation part of the graphical editors for FBD, LD, CFC, and SFC contains a toolbar in the lower right corner: Return to normal editing mode The mouse p

Structured Text and Extended Structured Text (ExST) :

ST Editor The ST editor is a textual editor used for the implementation of code in Structured Text (ST) and Extended Structured Text (ExST). The line numbering is displayed on the left side of the edi

ST Editor in Online Mode In online mode, CODESYS  displays the variables and expressions in the ST editor ( Monitoring of Values ). The writing and forcing of variables and expressions as well as debu

ST Expressions An expression is a construct that returns a value following its evaluation. Expressions consist of operators and operands. In Extended Structured Text (ExST) , you can also use assignme

Assignments :

ST Assignment Operator Syntax: <operand> := <expression> This assignment operator executes the same function as the MOVE operator. :

ST Assignment Operator for Outputs The assignment operator => assigns the output of a function, a function block, or a method to a variable. The position on the right side of the operator can also be

ExST Assignment: S= When the operand of the Set assignment switches to TRUE , then TRUE is assigned to the variable to the left of the operator. The variable is set. <variable name> S= <operand name>