6-4
Primer: S7-300 Programmable Controller, Quick Start
C79000-G7076-C500-01
STL stands for Statement List and is a textual programming language in
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 stands for Ladder Logic and is a graphical programming language in
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 stands for Function Block Diagram and is also a graphic programming
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 FBD are integrated into the STEP 7 Standard software. So
after you have installed STEP 7, all the editor, compiler, and test functions of
STL, LAD, and FBD are available to you.
You can change the language
setting for a block using the
View menu and you can
switch between STL, LAD, and
FBD!
STL = Statement
List
LAD = Ladder
Logic
FBD = Function
Block Diagram
STL, LAD, and
FBD are Integrated
into STEP 7
Programming Logic Blocks with STEP 7
What are STL, LAD, and FBD?
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