Rockwell-automation 1771-IR Series D RTD Input Module User Manual Instrukcja Użytkownika Strona 66
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2 and 4–Wire RTD SensorsE–2
Three–wire and 4–wire sensors compensate for lead resistance error.
Their schematic representation is shown below. The amount of error
elimination depends upon the difference between the resistance
values of the lead wires. The closer the resistance values are to each
other, the greater the amount of error that is eliminated.
Connections for 3 and 4–Wire Sensors
3-Wire Sensor
4-Wire Sensor
There are several ways to insure that the lead resistance values match
as closely as possible. They are:
• use heavy gauge wire (16–18 gauge)
• keep lead distances less than 1000 feet
• use quality cable that has a small tolerance impedance rating.
- 1
- 1
- Important User Information 2
- 3
- Related Products 4
- Product Compatibility 4
- Related Publications 5
- Using This ManualP–4 6
- Table of Contents 7
- Configuring Your RTD 8
- Module Status and Input 8
- Calibrating Your Module 8
- Table of Contents toc-iii 9
- Table of Contents 10
- Overview of the RTD Input 11
- How Analog Modules 12
- Communicate with 12
- Programmable Controllers 12
- Accuracy 13
- Chapter Summary 13
- Installing the RTD Input 15
- Calculate Power 16
- Requirements 16
- Determine Module 16
- Placement in the I/O 16
- Key the Backplane 17
- Connector 17
- Install the Module and 17
- Field Wiring Arm 17
- Connect Wiring to the 18
- Ground the Chassis and Module 20
- Interpret Status Indicators 21
- 23
- PLC-2 Program Example 24
- Program Action 25
- PLC-3 Program Example 26
- PLC-5 Program Example 27
- Module Scan Time 28
- Configuring Your RTD Module 29
- Data Format 30
- RTD Type 30
- Units of Measure 30
- Real Time Sampling 31
- Configuring Block for a 32
- Block Transfer Write 32
- Bit/Word Descriptions 32
- calibration complete 34
- Module Status and Input Data 35
- 39
- Performing 40
- Auto-calibration 40
- Gain Calibration 42
- Performing Manual 43
- Calibration 43
- Refer to the table below 44
- Calibration 45
- 47
- (1771-IR/D) 48
- 7–4 Troubleshooting 50
- 51
- 53
- PLC-3 Family Processors 54
- PLC-5 Family Processors 55
- Programming ExamplesB–4 56
- 57
- Signed-magnitude Binary 58
- Two's Complement Binary 59
- Data Table FormatsC–4 60
- Block Transfer (Mini-PLC-2 61
- Setting the Block Length 63
- (Multiple GET Instructions 63
- 2 and 4-Wire RTD Sensors 65
- 2 and 4–Wire RTD SensorsE–2 66
- Connecting 4-Wire 67
- 2 and 4–Wire RTD SensorsE–4 68
- Differences Between Series A 69
- RTD Modules and Series B. C 69
- CSA Hazardous Location 73
- Approval 73
- AllenĆBradley 77
- Publication Problem Report 77
- BUSINESS REPLY MAIL 78
- Worldwide representation 79
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