Function - Rotate bits of a register to the left.


IN : ANY  register
NBR : DINT Number of rotations (each rotation is 1 bit)


Q : ANY   Rotated register


RolDiag.gif (1376 octets)


Arguments can be signed or unsigned integers from 8 to 32 bits.

In LD language, the input rung (EN) enables the operation, and the output rung keeps the state of the input rung. In IL language, the first input must be loaded before the function call. The second input is the operand of the function.

ST Language

Q := ROL (IN, NBR);

FBD Language

RolFbd.gif (1241 octets)

LD Language

(* The rotation is executed only if EN is TRUE *)
(* ENO has the same value as EN *)
RolLd.gif (1501 octets)

IL Language:

Op1: LD  IN
     ROL NBR
     ST  Q

See also

SHL   SHR   ROR   SHLb   SHRb   ROLb   RORb   SHLw   SHRw   ROLw   RORw