Chapter 1 The History of Intelligent Control Technology Development+ Chapter 2 Common number system conversion+ Chapter 3 Introduction to PLC+ Chapter 4 Basic Data Type+ Chapter 5 PLC installation and wiring for the first time+ Chapter 6 NPN PNP signal input wiring+ Chapter 7 Wiring of indicator light start stop control+ Chapter 8 TIA Software Cognition and Experience+ Chapter 9 Programming of 24V indicator light start stop control+ Chapter 10 Simulation of indicator light start stop control program+