Basics of PLCs

Table of Contents
Introduction........................................................................... 2
PLCs....................................................................................... 3
Number Systems.................................................................... 7
Terminology......................................................................... 11
Basic Requirements .............................................................. 17
S7-200 Micro PLCs................................................................ 19
Programming a PLC.............................................................. 31
Discrete Inputs/Outputs........................................................ 38
Analog Inputs and Outputs................................................... 45
Timers ................................................................................. 48
Counters.............................................................................. 55
High-Speed Instructions ....................................................... 58
Specialized Expansion Modules ............................................ 62
Review Answers ................................................................... 69
Final Exam ........................................................................... 72