Rockwell-automation 1771-IR , D17716.5.76 RTD INPUT MODULE Manual de usuario Pagina 26
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Module Configuration
Chapter 5
52
You must indicate what format will be used to read data from your module.
Typically, BCD is selected with PLC–2 processors, and binary (also referred to
as integer or decimal) is selected with PLC–3 and PLC–5 processors. See
Table 5.A and Appendix C for details on Data Format.
Table 5.A
Selecting
Format for Reading Data
Decimal Bit 10
Octal Bit 12
Decimal Bit 9
Octal Bit 11
Data Format
0 0 BCD
0 1 2's complement binary
1 0 Signed magnitude binary
1 1 Same as signed magnitude binary
The RTD input module accepts the following types of RTD inputs:
RTD Temperature Range Indication
Word 1,
Bit 10
Ohms
o
C
o
F
Platinum -200 to +870
o
C (-328 to 1598
o
F) Underrange 0 1.00 -200 -328
Overange 600.00 870 1598
Copper -200 to +260
o
C (-328 to 500
o
F) Underrange 1 1.00 -200 -328
Overrange 327.67 260 500
The units of measure reported by the RTD module are selected by setting bits
06–07 in BTW word 1.
Units of Measure
Bit
07 06
Degrees C 0 0
Degrees F 0 1
Ohms 1 0
Not used 1 1
If any of bits 0–5 are set (1), the corresponding input channel will be reported in
ohms.
Data Format
RTD
T
ype
Units of Measure
- 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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