rol

 Function - Rotate bits of a register to the left.

Inputs

Input	Data Type	Range	Unit	Default	Description
IN	ANY				Register.
NBR	DINT				Number of rotations (each rotation is 1 bit).

Outputs

Output	Data Type	Range	Unit	Description
Q	ANY			Rotated register.

Remarks

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

Diagram

FBD Language Example

FFLD Language Example

• In the FFLD Language, the input rung (EN) enables the operation.
  • The output rung keeps the state of the input rung.
  • The rotation is executed only if EN is TRUE.
  • ENO keeps the same value as EN.

IL Language Example

• In the IL Language, the first input must be loaded before the function call.
  • The second input is the operand of the function.

Op1: LD  IN
     ROL NBR
     ST  Q

ST Language Example

Q := ROL (IN, NBR);

See Also

• ror
• shl
• shr