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141Rockwell Automation Publication 1756-UM010B-EN-P - December 2011
Appendix
D
Frequency Accuracy
Use this appendix to calculate the frequency accuracy for high resolution
frequency mode and totalizer mode.
Frequency Accuracy in
High Resolution
Frequency Mode
There are two steps to calculating frequency accuracy in high resolution
frequency mode.
1. Calculate frequency accuracy.
2. Determine the application’s operating conditions and add the error for
those conditions to the value obtained in step 1.
The following values must be added to your frequency accuracy results
in totalizer mode:
Crystal error - 0.005% @ 25°C
Drift and crystal error - 0.01% from 0° to 60°C
Calculate Frequency Accuracy
When calculating frequency accuracy in high resolution frequency mode, you
must know:
sample time period
input frequency
- User Manual 1
- Important User Information 2
- Summary of Changes 3
- New and Updated 3
- 4 Summary of Changes 4
- Table of Contents 5
- Chapter 4 6
- Installing the Configurable 6
- Table of Contents 7 7
- 8 Table of Contents 8
- Who Should Use 9
- This Manual 9
- Additional Resources 9
- 10 Preface 10
- What this Chapter Contains 11
- Using a ControlLogix 12
- CFM Module 12
- Physical Features 13
- Typical Applications 14
- Understanding Module 15
- Input Capabilities 15
- Output Capabilities 15
- Using Module 16
- Identification and Status 16
- Information 16
- What This Chapter Contains 17
- 1756-CFMLogix controller 18
- Ownership 19
- Using RSNetWorx and 19
- RSLogix 5000 Software 19
- CFM Modules in Local Chassis 20
- CFM Modules in Remote Chassis 20
- Connections 21
- Listen-Only Connections 22
- Configurable Flowmeter 23
- Modules in a Local Chassis 23
- Modules in a Remote 24
- Understanding General 25
- Module Features 25
- Module Fault Reporting 26
- Fully Software Configurable 26
- Electronic Keying 27
- Exact Match 28
- Compatible Keying 29
- Disabled Keying 32
- Producer/Consumer Model 33
- Module Status Information 34
- Flowmeter Inputs 34
- Gate Inputs 34
- Choosing an 35
- Operational Mode 35
- Operating in 36
- High Resolution 36
- Frequency Mode 36
- operate normally 37
- be forced ON or OFF 37
- Low Frequency Clear 38
- Sample Time 38
- Acceleration Calculation 39
- Meter Factor 39
- Trigger On 39
- Tie to Counter 39
- Highest Allowed Frequency 40
- Acceleration Alarm Value 40
- Acceleration 40
- Operating in Totalizer Mode 41
- Using the Totalizer Mode 42
- Using a Prover 43
- Prover Direction 44
- Total Overflow 45
- Total Overrange 45
- Total Overspeed 46
- Total Acceleration 46
- Prover Total 46
- Total Counts 46
- Frequency Period 47
- Gross Volume 47
- Net Volume 47
- Gross Rate 48
- Net Rate 49
- Prover Status 49
- Using the Totalizer 50
- Mode Filler Function 50
- PreTrigger 53
- Fill Mode 53
- Fill Enable 53
- Fill Start 54
- Fill Hold 54
- Fill State 54
- Fill Total 55
- Fill To tal Ta rget 57
- Fill Transition 57
- Fill Transition Timer 57
- Configurable Output 58
- Behaviors 58
- AVERTISSEMENT 62
- Power Requirements 63
- Installing the Module 64
- Keying the Removable 65
- Terminal Block/Interface 65
- Wiring the Removable 66
- Terminal Block 66
- Connect Wires to the RTBs 68
- Wiring the Module 69
- Removing the Removable 74
- Terminal Block from the 74
- Figure 5.2 75
- Removing the Module 76
- Configuring the Configurable 77
- Using this Chapter 78
- Overview of the 78
- Configuration Process 78
- Creating a New Module 80
- Communications Format 82
- Using the Default 83
- Configuration 83
- Altering the Default 84
- Accessing the Tags 85
- Changing Configuration 86
- Information at the Tags 86
- Downloading 87
- Configuration Data 87
- During CFM Module 88
- Operation 88
- Using Message 89
- Instructions 89
- Creating a New Tag 90
- Enter Message Configuration 92
- Communications Pop-Up Screen 93
- Tag Pop-Up Screen 94
- Configuring CFM Modules 95
- Sample Configuration for 101
- Totalizer Mode 101
- Prover Function 101
- Filler Function 108
- Flowmeter Module 115
- Software to Troubleshoot 117
- Your Module 117
- Using RSLogix 5000 117
- Determining Fault Type 118
- Using Error Codes 119
- Software Configuration Tags 121
- Input Tags 128
- Output Tags 132
- Schematics 137
- Output Circuits 139
- 140 Schematics 140
- Frequency Accuracy 141
- Frequency Accuracy in 143
- Frequency Average 145
- 146 Frequency Accuracy 146
- Appendix 147
- Glossary 157
- 158 Glossary 158
- Glossary 159 159
- 160 Glossary 160
- 162 Index 162
- Index 163 163
- 164 Index 164
- Index 165 165
- 166 Index 166
- Rockwell Automation Support 168
- Documentation Feedback 168
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