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

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

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

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

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

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

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

Operator: LE The IEC operator is used for the "less than or equal to" function. Permitted data types of the operands: any basic data type If the first operand is less than or equal to the second opera

Operator: GE The IEC operator is used for the "greater than or equal to" function. Permitted data types of the operands: any basic data type If the first operand is greater than or equal to the second

Operator: EQ The IEC operator compares two operands for equality. All elementary data types are permitted as data types for the operands. If the operands are equal, then the operator yields the result