18 BIT SHIFT FUNCTIONS
18.3 n-bit Left Rotation
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18.3 n-bit Left Rotation
ROL(_E)
These functions rotate an input value leftward by (n) bits and output the result.
â– Descriptions, types, and data types
â– Operation processing
• These functions rotate the WORD or DWORD type data input to (s) left by (n) bits and output the result in the same data
type as (s) from (d).
• The number input in (n) is used as the number of left-rotation bits.
When the data type of (s) is WORD and 3 is input in (n) (The bits are rotated left by 3 bits.)
• A value input to (n) is the WORD or DWORD type data value.
• A value input to (n) (Number of shift bits) is the INT type data value and within the following range.
Ladder diagram Structured text
[Without EN/ENO] [With EN/ENO] [Without EN/ENO]
d:=ROL(s,n);
[With EN/ENO]
d:=ROL_E(EN,ENO,s,n);
Argument Description Type Data type
EN Execution condition (TRUE: Execution, FALSE: Stop) Input variable BOOL
s Input Input variable ANY_BIT
n Number of shift bits Input variable ANY_BIT
ENO Output status (TRUE: Normal, FALSE: Abnormal) Output variable BOOL
d Output Output variable ANY_BIT
When the data type of (s) is WORD When the data type of (s) is DWORD
A value in (n) is within 0 to 15.
The lower 4-bit data of the value in (n) is used.
[Example]
When the input value is 6: 6
When the input value is 22: 6
A value in (n) is within 0 to 31.
The lower 5-bit data of the value in (n) is used.
[Example]
When the input value is 6: 6
When the input value is 22: 22
n-bit rotation
WORD, DWORD
Data of 1)
IN (WORD)
270FH 3879H
WORD
0100100011100111
270FH
0 111111110000000
3879H
Data of 2)
1) 2)
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