shl

 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. - Shift bits of a register to the left.

Inputs

Input	Data Type	Range	Unit	Default	Description
IN	ANY				Register.
NBS	ANY				Number of shifts (each shift is 1 bit).

Outputs

Output	Data Type	Range	Unit	Description
Q	ANY			Shifted 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 shift is executed only if EN is TRUE.
  • ENO has 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
     SHL NBS
     ST Q

ST Language Example

Q := SHL (IN, NBS);

See Also

• rol
• ror
• shr