Rockwell-automation 1756-IH16ISOE ControlLogix Sequence of Events Modu Manual de usuario Pagina 20
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Publication 1756-UM528A-EN-P - April 2004
2-4 How Does the Sequence of Events Module Operate in a ControlLogix System?
Propagating a Signal From
Field Device to Backplane
As shown in Figure 2.1, the Sequence of Events module receives a
signal at the RTB and processes it internally before sending a signal to
the ControlLogix backplane via the Requested Packet Interval (RPI) or
at na Enable CST Capture occurrence.
However, when you operate the Sequence of Events module, you
must account for signal propagation delays that exist during internal
processing. Some of these delays are inherent to the module and
others can be controlled via the user-defined module configuration.
During processing, the following delays exist:
• hardware delay - varies according to module type (i.e., catalog
number) and input transition type (i.e., OFF to ON/ON to OFF)
• input filter delay - user-configurable number from 0 to 50ms
• firmware scan time - up to 25µs, depending on when the input
transitions relative to the sample time
• ASIC delay - 25µs
Typically, the Sequence of Events module can deliver a signal to the
ControlLogix backplane within 275µs in FIFO mode and 725µs in CST
Per Point mode after it was received at the removable terminal block
(RTB); these 275µs or 725µs numbers represent a scenario where the
hardware delay is at maximum levels but no input filter is used.
IMPORTANT
The hardware delay is relatively consistent across
inputs on a module and across modules in a chassis.
Therefore, assuming the inputs and modules are
used in similar environmental conditions and with
similar voltages applied, the hardware delay is a
minor consideration affecting timestamping accuracy.
TIP
For fastest propagation of a signal from a field device
to the controller, use the module in FIFO mode in a
local chassis.
- ControlLogix 1
- Sequence of Events 1
- Important User Information 2
- Purpose of This Manual 3
- Who Should Use 3
- This Manual 3
- What This Manual Contains 4
- Related Documentation 4
- Preventing Electrostatic 5
- Discharge 5
- Environment and Enclosure 6
- Table of Contents 7
- Table of Contents 2 8
- Table of Contents 3 9
- Table of Contents 4 10
- Events Module? 11
- On-Board Data Storage 12
- What Else Does the 13
- Sequence of Event 13
- Module Do? 13
- Understanding the 14
- Module’s Physical Features 14
- Using Module 15
- Identification and 15
- Status Information 15
- Similar Functionality to 18
- Standard ControlLogix DC 18
- Input Modules 18
- Propagating a Signal From 20
- Field Device to Backplane 20
- Figure 2.1 21
- What This Chapter 27
- Contains 27
- Installing the Sequence of 27
- Figure 3.2 28
- Keying the Removable 29
- Terminal Block 29
- Connecting Wiring 30
- Spring Clamp RTB 31
- Wiring the Sequence of 32
- Assembling The Removable 33
- Terminal Block and 33
- Extended-Depth Housing 34
- Choosing the 34
- Figure 3.10 35
- Installing the Removable 36
- Locking tab 37
- Removing the Removable 38
- Removing the Module 39
- Configuring Your I/O 41
- Overview of the 42
- Configuration Process 42
- Adding a New Module to 43
- Your RSLogix 5000 Project 43
- Sequence of Events module 44
- Communications Format 45
- Electronic Keying 45
- Using the Default 46
- Configuration 46
- Altering the Default 46
- Downloading 47
- Editing Configuration 47
- Configuring Modules in a 49
- Remote Chassis 49
- Using the Sequence of Events 53
- Module Features 53
- Determining Module 54
- Compatibility 54
- Module Features That 55
- Can Be Configured 55
- Enable CST Capture 57
- Latch CST 59
- Chatter Detection 60
- Figure 5.1 63
- Figure 5.2 63
- Figure 5.3 64
- ATTENTION 66
- Module Inhibiting 67
- Other Inherent 68
- Fully Software Configurable 69
- Producer/Consumer Model 69
- Status Indicator Information 70
- CST Per Point Mode 73
- How Does the Module 74
- Store Timestamp Data in 74
- CST Per Point Mode? 74
- What Are The Typical 76
- Applications Where CST 76
- Per Point Mode is Used? 76
- Configuring the Module for 76
- Use this pull-down menu to 77
- Managing the Data in CST 80
- Per Point Mode 80
- Figure 6.3 83
- Figure 6.4 83
- Figure 6.5 85
- Sorting the Data 86
- Clearing All Data From the 86
- Module’s Buffers At Once 86
- FIFO Mode 87
- How Does the On-Board 88
- Buffer Work in FIFO Mode? 88
- What the Typical 90
- Applications Where FIFO 90
- Mode is Used? 90
- Managing the Data in 96
- Standard Retrieval 99
- Figure 7.2 100
- IMPORTANT 100
- Figure 7.3 102
- Figure 7.4 102
- Figure 7.5 103
- Retrieval by Point 104
- Figure 7.6 105
- Events Module 107
- Using RSLogix 5000 To 108
- Troubleshoot the Module 108
- Chapter Summary and 110
- What’s Next 110
- Appendix 111
- 1756-IB16ISOE 111
- Specifications 111
- 1756-IB16ISOE Module 114
- Block Diagram 114
- 1756-IH16ISOE 115
- 1756-IH16ISOE Module 118
- Overview 119
- What is the 1756HP-GPS 120
- Figure B.2 121
- Determining the Absolute 122
- First Fault Across Multiple 122
- Figure B.3 123
- How Does the ControlLogix 124
- Controller Retrieve 124
- Converted Value from the 124
- 1756HP-GPS Module? 124
- Converting Timestamps 126
- Universal Coordinated 126
- Time Format 126
- Figure B.5 127
- Figure C.1 130
- Figure C.2 131
- Synchronizing Chassis in 132
- ControlLogix Redundancy 132
- Related SynchLink 133
- Documentation 133
- Using Module Tags 135
- Module Tag Names 136
- Using Module Tags D-3 137
- Input Tags 138
- Using Module Tags D-5 139
- I.Timestamp[16].OffOn[2] 139
- I.Timestamp[16].OnOff[2] 139
- Output Tags 140
- Tags Used in FIFO Mode 141
- D-8 Using Module Tags 142
- D-10 Using Module Tags 144
- D-12 Using Module Tags 146
- Sequence of Events Module 147
- Accessing the 148
- Sample Projects 148
- Glossary 149
- Glossary 2 150
- Glossary 3 151
- Glossary 4 152
- 2 Index 154
- Index 3 155
- 4 Index 156
- How Are We Doing? 157
- BUSINESS REPLY MAIL 158
- Rockwell Automation 160
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