This E-book does a great job in describing the various tasks necessary to program SIEMENS SIMATIC S7 300/400 series of PLCs.
It is written for all users of SIMATIC S7 controllers.
It describes elements and applications of the graphic oriented programming languages LDA, FBD and STL.
There is also an introduction to configuration and parameter setting for the hardware by means of STEP7 software enhanced
by specific solution examples. The book also provides an introduction to version 5.3 programming software STEP7
and especially shows how the simulator software which comes with the software can be used to simulate programs.