A text covering fundamental programmable logic controller PLC programming and interfacing methods. Included is a collection of sample ladder logic program segments to perform specific tasks in any PLC program such as flashers nonstandard clocks timed counters and sequencers flip flops RS D T JK majority decision networks and oneshots. Topics then move into interfacing methods discrete sensors linear transducers encoders motor controllers PID system safety and pneumatics.The text can be used in any community college or universitylevel Engineering Technology PLC course and is also an excellent addition to an engineers or technicians technical reference library.Readers should have a thorough understanding of fundamental dc and ac circuits electronic devices including thyristors and a knowledge of college algebra and trigonometry.