Building a Programmable Logic Controller with a PIC16F648A Microcontroller

 

Contents

 

Preface

Acknowledgments

Background and Use of the Book

About the Author

1 Hardware of the PIC16F648A-Based PLC

2 Basic Software

2.1 Basic Software Structure

2.1.1 Variable Definitions

2.1.2 Macro HC165

2.1.3 Macro HC595

2.2 Elimination of Contact Bouncing Problem in the PIC16F648A-Based PLC

2.2.1 Contact Bouncing Problem

2.2.2 Understanding a Generic Single I/O Contact Debouncer

2.2.3 Debouncer Macros dbncrO and dbncrl

2.3 Basic Macros of the PIC16F648A-Based PLC

2.3.1 Macro initialize

2.3.2 Macro get_inputs

2.3.3 Macro send_outputs

2.4 Example Program

3 Contact and Relay-Based Macros

3.1 Macro Id (load)

3.2 Macro ld_not (load not)

3.3 Macro not

3.4 Macro or

3.5 Macro or_not

3.6 Macro nor

3.7 Macro and

3.8 Macro and_not

3.9 Macro ...