The purpose of this book is to teach and demonstrate the basics of the Rockwell Automation Allen-Bradley Micro800 family of programmable logic controllers. Information is provided to help the reader get and operate an inexpensive Micro810 programmable logic controller, associated hardware, and software. Examples with circuit diagrams are provided to demonstrate Micro810 ladder logic program capabilities. Information is also provided to relate the Micro810 to other programmable logic controllers. The person completing the examples will be able to write useful ladder logic programs for the entire Micro800 family of programmable logic controllers.