dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorProgramming with CODESYSdl-breadcrumb-item__separatorCODESYS Development Systemdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorReference, Programmingdl-breadcrumb-item__separatorProgramming Languages and Editorsdl-breadcrumb-item__separatorStructured Text and Extended Structured Text (ExST)dl-breadcrumb-item__separatorAssignments dl-breadcrumb-item__separatorExST – Assignment as expression
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ExST – Assignment as expressiondl-permalink__symbolPermalink

In ExST, as an extension to the IEC 61131-3 standard, CODESYS permits the use of assignments as expressions.

Examples

‎int_var1 := int_var2 := int_var3 + 9; ‎

(* ‎int_var1‎ and ‎int_var2‎ receive the value of ‎int_var3 + 9‎ *)

‎real_var1 := real_var2 := int_var;‎

(* ‎real_var1‎ and ‎real_var2‎ receive the value of ‎int_var ‎ *)

‎int_var := real_var1 := int_var;‎

(* incorrect assignment, the data types do not correspond! *)

‎IF b := (i = 1) THEN‎

‎ i := i + 1;‎

‎END_IF‎