What Are Stl, Lad, And Fbd - Siemens SIMATIC S7-300 Quick Start Manual

Programming Logic Blocks with STEP 7
STL = Statement STL stands for Statement List and is a textual programming language in
List STEP 7. The syntax of the statements is close to machine code: Instructions
or operations are followed by addresses. You can use this to program your
control task in STL for optimal memory capacity and runtime.
LAD = Ladder
LAD stands for Ladder Logic and is a graphical programming language in
Logic
STEP 7. The syntax of the statements is similar to a circuit diagram and
enables you to easily follow the signal flow between conductor bars via
contacts, complex elements and coils.
FBD = Function FBD stands for Function Block Diagram and is also a graphic programming
Block Diagram language in STEP 7. The statements are represented as logic boxes, similar to
those in boolean algebra. As with the wiring diagrams in digital technology,
you can follow the signal flow by means of the boxes.
STL, LAD, and
STL, LAD, and FBD are integrated into the STEP 7 Standard software. So
FBD are Integrated
after you have installed STEP 7, all the editor, compiler, and test functions of
into STEP 7 STL, LAD, and FBD are available to you.
6-4

What are STL, LAD, and FBD?

You can change the language
setting for a block using the
View menu and you can
switch between STL, LAD, and
Primer: S7-300 Programmable Controller, Quick Start
FBD!
C79000-G7076-C500-01