x Contents C H A P T E R 1 Programmable Logic Controller (PLC) Overview . . . . . . . . . . . . . .2 1.1 PLC History and Development .............................................................4 1.2 PLC Block Diagram .............................................................................. 5 1.3 Central Processing Unit ........................................................................ 6 1.4 Memory Devices..................................................................................... 7 1.5 Address Decoder Circuit ..................................................................... 10 1.6 Peripheral Chips.................................................................................. 10 1.7 Discrete Input Modules ....................................................................... 10 1.8 Discrete Output Modules .................................................................... 11 1.9 Analog Input /Output Modules ...........................................................12 1.10 PLC Power Supply .............................................................................12 1.11 Allen-Bradley Programmable Controllers........................................12 1.12 Allen-Bradley Programmable Logic Controllers .............................. 13 1.13 Commonly Used Industrial Controllers ............................................ 14 1.14 Communication with Intelligent Industrial Controllers .................. 16 C H A P T E R 2 PLC Selection, Components, and Communication . . . . . . . . . . . . 18 2.1 PLC Selection.......................................................................................20 2.2 Allen-Bradley SLC 500 Components ..................................................20 2.3 PLC Memory Expansion and Usage ................................................... 27 2.4 PLC Communication Systems ............................................................28 2.5 Programming Modules .......................................................................30 2.6 Introduction to the LogixPro Simulator Software............................. 32 2.7 The Allen-Bradley ControlLogix Family of Controllers..................... 32 2.8 Comparison of RSLogix 5000 and RSLogix 500 ................................34 2.9 The Industrial Control Design Process ..............................................35 2.10 Use of HMI in Industrial Control Systems ...................................... 37 1 2