This first book, Basic Concepts of Ladder Logic Programming, of the five book PLC Programming Using RSLogix 500 series, focuses on many practical aspects of machine logic programming. Based on Allen Bradley's SLC 500 family of PLC's, the author takes you through the basic concepts and instructions used in ladder logic programming. Topics discussed and illustrated include: Basic Instructions and how they function, PLC architecture, I/O module function and configuration, the use of timers and counter instructions, memory allocation and addressing syntax, field wiring, and many other important concepts. The goal of this book is to provide a practical resource for those new to PLC technology and ladder logic programming; and to help you learn the necessary skills for doing your own programming and troubleshooting of PLC applications.