Rockwell-automation 1747-BSN Backup Scanner Module User Manual Page 175
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Publication 1747-UM010B-EN-P - September 2003
Specifications A-11
3. Calculate the maximum T
ri
time for each logical rack. Do this by
determining the largest BT that occurs to any device within a
logical rack and calculating the transfer time using the table on
page A-8. Then add together the T
ri
times for each logical rack to
obtain T
btx
.
T
ri
for rack 0 = 0.150(8) + 3.5 = 4.7 ms (maximum BT to rack 0 is
8 words)
T
ri
for rack 1 = 0.150(2) + 3.5 = 3.8 ms (maximum BT to rack 1 is
2 words)
T
ri
for rack 2 = 0.150(64) + 3.5 = 13.1 ms (maximum BT to rack 2
is 64 words)
T
btx
= T
ri0
+ T
ri1
+ T
ri2
= 4.7 + 3.8 + 13.1 = 21.6 ms
4. Substitute all the values for variables in the throughput formula
and solve for throughput.
T
dm-bt
= 2(25.0) + 2(16.5) + 2(21.6) + 9.0 + 22.0 + 5.0 + 10.0 + 1.0
T
dm-bt
= 173.2 ms = maximum throughput
Block Transfer Throughput
Block transfer throughput is the time from when the BT is enabled via
the EN bit, until the DN bit is processed. The following BT timing
explanations are based on the directional continuous BT example
shown on page 7-19, where a BT is re-triggered automatically upon
each completion.
- Backup Scanner 1
- Important User Information 2
- Summary of Changes 3
- 4 Summary of Changes 4
- Table of Contents 5
- Chapter 4 6
- Chapter 5 6
- Configuration and Programming 6
- Chapter 6 7
- Chapter 7 7
- Table of Contents iv 8
- Table of Contents v 9
- Table of Contents vi 10
- Who Should Use This 11
- How to Use This Manual 11
- Conventions Used in This 12
- Rockwell Automation 13
- 4 Preface 14
- Overview 15
- How the Backup Scanner 18
- Scans Remote I/O 18
- SLC and Scanner 19
- Asynchronous Operation 19
- How the Scanner Interacts 20
- Example Scanner I/O Image 22
- Complementary I/O 24
- Overview 1-11 25
- 2-Slot Addressing 26
- 1-Slot Addressing 27
- 1/2-Slot Addressing 28
- Discrete Modules 29
- Block Transfer Modules 29
- 012 3 45678 30
- 012 345678 30
- Application Considerations 31
- Hardware Features 32
- Overview 1-19 33
- Configuration Switch 33
- Module Address Switch 33
- Compatible Devices 34
- Backup Concepts for the 35
- SLC 500 System 35
- Processor Catalog Number 36
- SLC 5/02 1747-L524 36
- SLC 5/03 1747-L531, -L532 36
- Data Transfer 37
- Switchover 37
- Role of the 1747-BSN Module 38
- Required Tools and 39
- Equipment 39
- Procedures 40
- Installation and Wiring 43
- Low Voltage Directive 44
- Safety Considerations 44
- Configuration Selection 45
- Installation 46
- Insertion 47
- Wiring Considerations 48
- DH+ Network Wiring 50
- Status LEDs 51
- Chapter Objectives 53
- How the 1747-BSN Module 53
- Operates 53
- RIO/DH+ Communication Channel 55
- Data Table Transfer 58
- How the Backup System 59
- Startup Sequencing 60
- Power-up Sequencing 61
- Processor Mode Change 61
- Sequencing 61
- Fail-over Sequencing 61
- Power Down Sequencing 62
- Restarting a Failed System 62
- 0123456789101112131415 67
- 0246024602460246 67
- Rules for Configuring the 68
- RIO Logical Rack 11 Starting 70
- Logical Group 70
- G-File Considerations For 74
- Configuring Remote I/O 74
- Crossing Logical Rack 74
- Boundaries 74
- Understanding M Files 76
- M0 Control File Description 78
- M0 File - RIO Device Inhibit 79
- M0 File - RIO Device Reset 80
- M0 File - Remote Output 81
- Reset Control 81
- Example 3 84
- M1 Status File Description 85
- Active Device Status 88
- 1100100001000100 88
- 101111101100111 88
- 1001100001000000 88
- 02460246 89
- RIO Status Example 90
- IMPORTANT 91
- Understanding Slot 94
- Addressing 94
- SLC/Scanner Configuration 95
- Using HHT 95
- System Status Word 98
- Module Status Word 100
- Transferring Data over the 101
- High-Speed Serial Link 101
- Data Transfer Control Word 102
- Data Transfer Status Word 103
- Data Transfer Handshake 104
- Data Transfer Handshake Word 105
- Program File 2 106
- Program File 3 107
- Program File 4 108
- Switch Assemblies Status 109
- Module Status Counters 110
- Data Block Counters 111
- RIO Block Transfer 113
- RIO Block Transfer General 117
- Functional Overview 117
- Example 1 119
- Example 2 120
- Using Block Transfer 121
- Instructions (BTR and BTW) 121
- Parameters for BTR and BTW 123
- Control Status Bits 124
- Instruction Operation 128
- Programming Examples 129
- Figure 7.2 Directional 130
- Switchover Considerations 135
- Input Signal Update Time 136
- Time-out on Remote I/O Link 136
- Divergence 137
- Forcing I/O 137
- Data Highway Plus 138
- Switching 138
- Remote I/O Switching 140
- Programming Techniques 143
- Data Transfer Schemes 156
- Data Transfer Method 2 158
- Accounting for Instructions 159
- That Could Cause Problems 159
- During Switchover 159
- Timer Instructions 160
- Counter Instructions 161
- FIFO Instructions 162
- Block Transfer Instructions 162
- Message Instructions 163
- PID Control Files 163
- Summary of Programming 164
- Considerations 164
- Specifications 165
- Network Specifications 166
- Throughput Introduction 166
- Calculating Throughput 167
- A-4 Specifications 168
- RIO Scan Time Calculation (T 169
- Present 169
- A-6 Specifications 170
- Specifications A-7 171
- Determining T 172
- Specifications A-9 173
- A-10 Specifications 174
- Block Transfer Throughput 175
- A-12 Specifications 176
- Specifications A-13 177
- ) Tables 178
- without M0 File Writes 179
- A-16 Specifications 180
- M0-M1 Files and G Files 181
- Configuring M0-M1 Files 182
- Addressing M0-M1 Files 182
- M0/M1 Monitoring 183
- Access Time 184
- SLC 5/02 Processor Example 185
- Minimizing the Scan Time 186
- Capturing M0-M1 File Data 187
- Editing G File Data 189
- RIO Configuration Worksheet 191
- Glossary 193
- 4 Glossary 194
- Glossary 5 195
- 6 Glossary 196
- Glossary 7 197
- 8 Glossary 198
- 2 Index 200
- Index 3 201
- 4 Index 202
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