Operator ‘SHR’

This IEC operator is used for bitwise shift of an operand to the right.

erg := SHR (in, n)

in: Operand that is shifted to the right

n: Number of bits for shifting in to the right

Attention

If n overwrites the data type width, then it depends on the target system how the BYTE, WORD, DWORD, and LWORD operands are padded. The target systems cause padding with zeros or n MOD <tab width>.

Examples

ST:

PROGRAM shr_st
VAR
 in_byte : BYTE:=16#45; (* 2#01000101 )
 in_word : WORD:=16#0045; (* 2#0000000001000101 )
 erg_byte : BYTE;
 erg_word : WORD;
 n: BYTE :=2;
END_VAR

erg_byte := SHR(in_byte,n); (* Result is 16#11, 2#00010001 *)
erg_word := SHR(in_word,n); (* Result is 16#0011, 2#0000000000010001 *)

FBD: