The PLC Siemens Statement List eBook course covers the Siemens Statement List (STL) programming language. STEP 7 projects can contain blocks that are programmed in either the Ladder Logic (LAD), Statement List, or Functional Block Diagram (FBD) programming languages.
What is Statement List Language?
The Statement List (STL) programming language is one of the three programming languages available in the basic STEP 7 software package. It is a text-based programming language with a structure similar to assembly language or machine code. STL is the native language of S7-300 and S7-400 processors.
Programmers typically use the STL language in blocks containing large amounts of math or memory table processing, or when types of addressing are required that are not available in the ladder logic (LAD) language. They also use STL when the program must be efficient in terms of processory memory usage and scan cycle time.