Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 10
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An Introduction to Programmable
Controllers
Chapter 2
23
Figure 2.3
The
Four Major Sections of a Programmable Controller
10719-I
Power Supply
Processor
Information
Input Devices
Limit, Proximity,
Action
(Decision Making)
w
Pressure,
Temperature
Switches
Push Buttons
Logic
BCD
A/D
w
w
w
w
Output Devices
Solenoidsw
Motor Starters
Indicators
Alarms
Logic
BCD
D/A
w
w
w
w
w
w
Power
Supply
The power supply provides a low level DC voltage source for the electronic
circuitry of the programmable controller. It converts the higher level line
voltages to low level logic voltages required by the programmable controller’s
electronic circuitry.
Input
Section
The input section serves four very important functions:
Termination
Indication
Conditioning
Isolation
Termination
The input section provides terminals for the field wiring coming from the
sensing devices on the machine.
- Programming 1
- Operations 1
- Table of Contents 2
- Table of Contentsii 3
- Table of Contents iii 4
- Table of Contentsiv 5
- Introduction 6
- Traditional Controls 8
- Programmable Control 9
- The Four Major Sections 9
- Controllers 10
- Chapter 2 10
- PC Control Sequence 15
- Scan Sequence 16
- Conclusion 19
- Major Components 20
- General Features 20
- Hardware Features 20
- Mini-PLC-2/15 System: 21
- An Overview 21
- Chapter 3 21
- Optional Features 26
- Memory Organization 30
- Chapter 4 31
- Data Table Areas 35
- User Program 35
- Message Storage 36
- Fundamental Instruction Set 38
- Programming Logic 38
- Chapter 5 39
- Hardware Review 39
- Set vs. Reset 39
- X X / XXX 40
- 0 0 / 121 40
- Bit Examining Instructions 42
- Branching Instructions 43
- Timers and Counters 45
- Counter Instructions 48
- Section D 51
- Compare Instructions 52
- Section E 54
- Arithmetic Instructions 54
- Scan Theory 58
- Program Control Instructions 65
- Immediate Update I/O 67
- Instructions 67
- SECTION D 77
- Advance Data Manipulation 77
- Modes of Operation 79
- Data Monitor Mode Display 81
- Sequencer Instructions 86
- SECTION E 92
- Block Transfer Instructions 92
- Block Transfer Syntax 94
- Block Programming 97
- Buffering Data 98
- Advanced Instruction Set 100
- Chapter 6 100
- Operations Overview 101
- Chapter 7 102
- Objectives 104
- System Start Up 104
- Chapter 104
- Section A 105
- Relay Type Instructions 105
- Chapter 8 106
- Bit Controlling Instructions 109
- Section B 111
- Editing Your Instructions 111
- Programming Applications 118
- Chapter 9 119
- Application Two 120
- Application Three 121
- Block Format Instructions 123
- File Instruction Programming 123
- Chapter 10 124
- Before you begin: 124
- Editing a File 130
- Let's Begin 131
- Section C 132
- Programming Limitations 133
- Bottle Filling Application 134
- Documenting Your Program 134
- Special Programming Aids 148
- Chapter 11 149
- OnLine Data Change 149
- Online Programming 149
- Data Initialization Key 150
- Block Transfer 152
- Bidirectional Block Transfer 156
- Special Program Techniques 158
- Manual Restart 160
- Cascading 161
- Figure 11.8 162
- Hour Clock 162
- Run Time Errors 163
- Chapter 12 164
- Troubleshooting Aids 165
- Chapter 13 166
- Bit Monitor Function 166
- Temporary End Instruction 168
- Quick Reference Section 170
- Appendix A 171
- Industrial Terminal Commands 185
- Glossary 194
- Appendix B 195
- Worldwide representation 215
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