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Overview

The programming languages Ladder Logic, Statement List, and Function Block Diagram for S7-300 and S7-400 are an integral part of the standard package.

• Ladder Logic (or LAD) is a graphic representation of the STEP 7 programming language. Its syntax for the instructions is similar to a relay ladder logic diagram: Ladder allows you to track the power flow between power rails as it passes through various contacts, complex elements, and output coils.

• Statement List (or STL) is a textual representation of the STEP 7 programming language, similar to machine code. If a program is written in Statement List, the individual instructions correspond to the steps with which the CPU executes the program. To make programming easier, Statement List has been extended to include some high-level language constructions (such as structured data access and block parameters).

• Function Block Diagram (FBD) is a graphic representation of the STEP 7 programming language and uses the logic boxes familiar from Boolean algebra to represent the logic. Complex functions (for example, math functions) can be represented directly in conjunction with the logic boxes.

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