rol

 Function A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - 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 "Free Form Ladder Diagram" 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 "Instruction List" This is a low-level language and resembles assembly Language, the first input must be loaded before the function call.
  • The second input is the operand of the function.

Op1: LD "Ladder diagram"
Ladder logic is a method of drawing electrical logic schematics. It is now a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical "rails" and a series of horizontal "rungs" between them  IN
     ROL NBR
     ST  Q

ST Language Example

Q := ROL (IN, NBR);

See Also

• ror
• shl
• shr