This manual is your guide to creating user programs in the Ladder Logic (LAD) programming language. This manual also includes a reference section that describes the syntax and functions of the language elements of Ladder Logic.
The manual is intended for S7 programmers, operators, and maintenance/service personnel. In order to understand this manual, general knowledge of automation technology is required. In addition to, computer literacy and the knowledge of other working equipment
similar to the PC (e.g.
This manual provides descriptions and examples of S7 functions FCs and function blocks FBs in ladder logic (LAD) representation. These FCs and FBs are available to program your S7-300/S7-400 programmable logic controller (PLC). This manual is intended as a reference to provide the necessary information for each function.
The FCs and FBs described in this manual are located in the Standard Library of STEP 7. Using your STEP 7 file manager, you can copy the FCs and FBs you need to your destination program directory.
Using practical exercises, we will show you how easy it is to program in Ladder
Logic, Statement List, or Function Block Diagram with STEP 7.
Detailed instructions in the individual chapters will show you step-by-step the
many ways in which you can use STEP 7.
Creating a Program with Binary Logic
In Chapters 2 to 7, you will create a program with binary logic. Using the
programmed logic operations, you will address the inputs and outputs of your CPU
Benefits of the PLC compared to conventional solutions such as electrical, electropneumatic or electrohydraulic solutions
Functions of system components of a PLC
Commissioning a PLC
Application criteria for mechanical, optical, capacitive and inductive proximity sensors
Sequence control and parallel logic
Systematic programming of a PLC in accordance with international standard IEC 1131-3
IEC 1131-3 programming languages: Function Block Diagram, Ladder Diagram, Statement List, Structured Text and Sequence Language
A PLC (Festo FC34, SIMATIC S7-300 or Allen ...