CODESYS Development System
ST Comments Comment Description Example Single-line There are two ways of marking: Starts with // and ends at the end of the line Starts with /// and ends at the end of the line In CODESYS , these com
CODESYS Development System
Variables The scope of a variable defines how and where you can use a variable. You define the scope in the variable declaration. :
CODESYS Development System
Variable: VAR_INPUT Input variables are used at the inputs of function blocks. You declare VAR_INPUT variables between the VAR_INPUT and END_VAR keywords in the declaration part of POUs. When called,
CODESYS Development System
Variable: VAR_OUTPUT Output variables are used at the outputs of function blocks. You declare VAR_OUTPUT variables between the VAR_OUTPUT and END_VAR keywords in the declaration part of POUs. The valu
CODESYS Development System
Variable: VAR_TEMP This functionality is an extension of the IEC 61131-3 standard. You declare temporary variables locally between the keywords VAR_TEMP and END_VAR . VAR_TEMP declarations are possibl
CODESYS Development System
Variable: VAR_STAT This functionality is an extension of the IEC 61131-3 standard. You declare static variables locally between the keywords VAR_STAT and END_VAR . Static variables are initialized on
CODESYS Development System
Variable: VAR_EXTERNAL External variables are global variables that are "imported" into a POU. You declare these variables between the keywords VAR_EXTERNAL and END_VAR . If the global variable does n
CODESYS Development System
Operator: LIMIT The IEC selection operator is used for limiting. OUT := LIMIT(Min, IN, Max) That means: OUT := MIN (MAX (IN, Min), Max) Max is the upper limit and Min is the lower limit for the result
CODESYS Development System
Operator: GT The IEC operator is used for the "greater than" function. Permitted data types of the operands: any basic data type If the first operand is greater than the second operand, then the opera
CODESYS Development System
Operator: LT The IEC operator is used for the "less than" function. Permitted data types of the operands: any basic data type If the first operand is less than the second operand, then the operator yi