Technical data

Creating Blocks and Libraries
9.2 Selecting the Programming Language
Programming with STEP 7
218 Manual, 05/2010, A5E02789666-01
9.2.1 Ladder Logic Programming Language (LAD)
The graphic programming language Ladder Logic (LAD) is based on the representation of circuit
diagrams. The elements of a circuit diagram, e.g. normally open contacts and normally closed
contacts, are combined to form networks. The code section of a logic block represents one or more
networks.
Example of Networks in LAD
The programming language LAD is supplied with the standard STEP 7 software package.
Programs are created under LAD with an incremental editor.