This book teaches and demonstrates the basics of the Allen-Bradley MicroLogix 1000 programmable logic controller. Information is provided to help the reader get and operate an inexpensive MicroLogix 1000 and associated hardware and software. Examples with ladder diagrams and circuit diagrams are provided to demonstrate different MicroLogix 1000 capabilities. Background information is provided to relate the MicroLogix 1000 to other programmable logic controllers.