The following pages contain a basic tutorial on PLC's. Please select the section of interest from the links below or click on the arrow to start on the first page. THE PLC    (A brief history and description of the PLC). ANALOG (Analog Inputs and Outputs). COMMUNICATIONS (PLC Communications). COMPARATORS (Various Comparators and their use). COUNTERS (Counters and their use). DATA (How PLC's Store Data). GATES (AND & OR Gates). NUMBERING SYSTEMS (PLC Numbering Systems). PLC PROGRAMMING SCAN (How PLC's SCAN the program). PULSE (How to Generate a Pulse/Edge trigger in S5). SET & RESET (Set and Reset of an Output). SHIFT REGISTER (Shift Registers). STATEMENT LIST (Programming in STATEMENTS instead of LADDER). TIMERS (Creating and using Time delays). PROGRAMMING EXAMPLES (Other Programming Examples).