Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario Pagina 15
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Installing the RTD Input Module
Chapter 3
34
Figure 3.2
Connection
Diagram for RTDs
18
16
14
12
10
8
6
4
2
C
B
A
C
B
A
C
B
A
C
B
A
C
B
A
C
B
A
12935
RTD
Ground
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Terminal
Identification
Chassis
Most importantly, you must ground the shield at the chassis end only. We
recommend connecting each input cable’s shield to a properly grounded
common bus.
Refer to Appendix E for 2–wire and 4–wire RTD connections.
Cable impedance –– Since the operating principle of the RTD module is based
on the measurement of resistance, you must take special care in selecting your
input cables. Select a cable that has a consistent impedance throughout its entire
length. We recommend Belden 9533 or equivalent. As cable length is directly
related to overall cable impedance, keep input cables as short as possible by
locating your I/O chassis as near the RTD sensors as I/O module considerations
permit. Keep the cable free of kinks and nicks to the shielding material.
Maximum cable length is limited by an overall cable impedance of 10 ohms on
a single wire. This recommendation is based on considerations of signal
degradation due to resistance mismatch between the three conductors within the
cable.
- RTD Input Module 1
- Cat. No. 1771-IR Series B 1
- Important User Information 2
- Table of Contents 3
- Table of Contentsii 4
- Table of Contents iii 5
- Using This Manual 6
- Chapter 1 8
- Related Publications 8
- Module Description 9
- Features of the Input Module 9
- Chapter 2 10
- How Analog Modules 10
- Communicate with 10
- Programmable Controllers 10
- Series B Cat. No. 1771-WF 11
- 1771-6.5.76 11
- Chapter Objectives 12
- Before You Install Your Input 12
- Electrostatic Damage 12
- Chapter 12
- Chapter 3 14
- Connecting Wiring 14
- Grounding the Input Module 16
- Installing the Input Module 16
- Interpreting the Indicator 17
- Chapter Summary 17
- Module Programming 18
- Chapter 4 19
- PLC-2 Program Example 19
- Module Scan Time 24
- Module Configuration 25
- Units of Measure 26
- Configuring 28
- Block for a 28
- Chapter 5 29
- Bit/Word Descriptions 29
- Default Configuration for the 30
- Module Status and Input Data 31
- Chapter 6 32
- Module Calibration 34
- Performing Auto-calibration 35
- Complete 36
- Chapter 7 37
- Save Calibration Values 38
- Performing Manual Calibration 38
- Offset Calibration 39
- Gain Calibration 40
- Troubleshooting 42
- Chapter 8 43
- Status Reported in Word 9 44
- Specifications 45
- Appendix A 46
- Programming Examples 47
- Appendix B 48
- PLC-3 Family Processors 49
- PLC-5 Family Processors 50
- Data Table Formats 52
- Data Formats 53
- Appendix C 53
- Signed-magnitude Binary 53
- Two's Complement Binary 54
- Processors) 55
- PLC-2/20 Processors) 56
- Appendix D 56
- 2 and 4-Wire RTD Sensors 60
- 2 and 4-Wire Sensors 61
- Appendix E 61
- Connecting 4-Wire Sensors 61
- RTD Input Modules 63
- Differences between Series A 64
- Appendix F 64
- Printed in USA 68
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