Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 19
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Positioning Concepts
Chapter 2
23
Figure 2.3
Circulations
50035
Gate
(received from transducer)
Gate
(received from transducer)
Duration
(1 circulation)
Duration
(2 circulations)
resolution = 0.002
resolution = 0.001
A Simple Positioning Loop
To move a specified distance along an axis, you can command the hydraulic
device to move at a specific velocity for a specific length of time. However, this
method can be imprecise. To control the position of the hydraulic device
accurately you need a loop to monitor actual position. Figure 2.4 shows a
simple positioning loop.
Figure 2.4
Positioning
Loop
50036
Linear
Displacement
Transducer
Servo Valve
Desired
Velocity
D/A
Axis
Kp
Velocity
Command
s
Following
Error
dt
Position
Command
s
dt
+
-
Actual
Position
Integrator
- Linear Positioning Module 1
- Important User Information 2
- Table of Contents 3
- Table of Contentsii 4
- Table of Contents iii 5
- Table of Contentsiv 6
- Table of Contents v 7
- Table of Contentsvi 8
- Organization of the Manual 9
- Audience 10
- Related Publications 10
- Related Software 10
- Frequently Used Terms 11
- Chapter 1 13
- Transducers 13
- Product Compatibility 13
- Servo and Proportional Valves 14
- System Overview 15
- Positioning Concepts 17
- Chapter 2 18
- ClosedLoop Positioning 18
- A Simple Positioning Loop 19
- Proportional Gain 20
- Feedforwarding 21
- Deadband 23
- PID Band 23
- How the Module Fits in a 25
- Positioning System 25
- Chapter 3 27
- Setpoints 28
- Commanding Motion 28
- Motion Blocks 29
- Hardware Description 30
- Chapter 4 31
- Wiring Arm Terminals 31
- Number of Circulations 32
- Transducer Interface 32
- Determining the Optimum 32
- Discrete Inputs 34
- Auto/Manual Input 35
- Hardware Start Input 35
- Discrete Outputs 37
- OUTPUT 1 38
- OUTPUT 2 38
- Power Supplies 38
- Planning Module Location 40
- Chapter 5 41
- Electrostatic Discharge 41
- Setting Analog Output 41
- Switches 41
- Inserting the Module 44
- Using Shielded Cables 45
- Wiring Guidelines 45
- Using Twisted Wire Pairs 47
- Connecting AC Power 47
- Connecting the Transducer 49
- Interface 49
- Power Supply 50
- Jog Forward Input 54
- Jog Reverse Input 55
- General Purpose Inputs 55
- Connecting Multiple Modules 55
- Connecting the Analog 57
- Analog Output 58
- Connecting the Discrete 59
- PLC Communication Overview 62
- Chapter 6 63
- Word Assignment 63
- Status Word 1 (words 2 and 6) 64
- Status Word 2 (words 3 and 7) 68
- Analog Range (words 2 and 31) 84
- Transducer 87
- PID Band (words 12 and 41) 93
- Deadband (words 13 and 42) 94
- Gain Factor (words 19 and 48) 99
- Chapter 7 100
- Setpoint Block 106
- Setpoint Position 109
- Local Velocity 110
- Command Block 111
- Chapter 119
- Before You Begin 119
- 5 12 Application dependent 121
- 0 700 Application dependent 121
- (LS) Zeroposition offset 122
- Figure 8.2 123
- Block Data T 123
- Chapter 8 124
- Analog Calibration Constants 128
- Axis Tuning 128
- Feedforward Gain 129
- PID Loop Gains 130
- Advanced Features 132
- Chapter 9 133
- Motion Block Control Word 135
- Programmable I/O Control Word 136
- Programmable Input and 136
- Default I/O Configuration 139
- Motion Segment Control Words 139
- Motion Segments 139
- Using the Motion Block 143
- Sample Application Programs 145
- Chapter 10 146
- Block Transfer Sequencing 146
- PLC5 Block Transfer 147
- Instructions 147
- Application Program #1 147
- Figure 10.5 151
- Application Program #2 155
- Figure 10.10 157
- Troubleshooting 163
- Chapter 11 164
- Module Fault Indicator 164
- Loop Active Indicators 164
- Troubleshooting Feedback 165
- Troubleshooting Flowchart 166
- Flowchart Notes 169
- Appendix 170
- Appendix A 171
- Status Block 175
- Appendix B 176
- Parameter Block 183
- Appendix C 184
- BCD or binary 186
- Appendix D 195
- Appendix E 198
- Motion Block 201
- Appendix F 202
- Hexadecimal Data Table Forms 206
- (LS) Zero 207
- + Software travel limit 207
- Appendix G 213
- Appendix G 214
- Description 216
- Data Formats 218
- Appendix H 219
- Bit Inversion Method 219
- Subtraction Method 219
- Implied Decimal 219
- Position Format 220
- Double Word Position Format 221
- Product Specifications 222
- With major offices worldwide 226
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