Operator: ROR

The IEC operator is used for bitwise rotation of an operand to the right.

Permitted data types: BYTE, WORD, DWORD, LWORD

erg := ROR(in,n)

CODESYS moves in n-times one bit to the right and adds the bit to the rightmost position from the left.

Tip

The number of bits which CODESYS uses for this operation is defined by the data type of the in input variable. If this is a constant, then CODESYS uses the smallest possible data type. The data type of the output variables still does not influence this operation.

Example 122. Examples

The results for erg_byte and erg_word are different depending on the data type of the input variables, although the values of the in_byte and in_word input variables are the same.

PROGRAM ror_st

VAR
 in_byte : BYTE := 16#45;
 in_word : WORD := 16#45;
 erg_byte : BYTE;
 erg_word : WORD;
 n: BYTE := 2;
END_VAR

erg_byte := ROR(in_byte,n); (* Result: 16#51 *)
erg_word := ROR(in_word,n); (* Result: 16#4011 *)

FBD