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82 Estimating Network Performance
890 USE 100 00
3.12 Formula for Calculating Token Rotation
The formula for calculating the average token rotation time is:
TR = (2.08 + 0.016 * DMW ) * DMP + (0.19 + 0.016 * GDW ) * GDN + 0.53 * N
where:
V TR is the average token rotation time in ms
V DMW is the average number of words per Data Master path used
in the network (maximum 100 for controllers)
V DMP is the number of Data Master paths used continuously in the
network (see the two notes below)
V GDW is the average number of global data words per message used
in the network (maximum 32)
V GDN is the number of nodes with global data transmitted in the
network
V N is the number of nodes on the network
Note: When counting Data Master paths, consider the ratio between
the network’s token rotation time and the device’s scan time. The way
in which you count paths depends upon which of these two times is
the faster.
- Modbus Plus Network 1
- Preface iii 2
- 890 USE 100 00 10
- Appendix D 11
- Contents 13
- Related Publications 16
- Chapter 1 17
- Introducing the Modbus Plus 17
- NETWORK A 20
- NETWORK B 20
- NETWORK C 20
- NETWORK D 20
- 1.2 Network Terminology 21
- Figure 5 Cable Tap Layout 26
- Hot Standby Configurations 27
- Quantum Automation Series 29
- Hardware Reference Guide 29
- Figure 10 TIO Module 30
- Modbus Plus 40
- Network I/O Servicing Guide 40
- 1.10 Using Peer Cop 41
- Receiving Data 42
- Figure 14 Peer Cop Example 43
- 1.1 1 Expanding the Network 45
- Chapter 2 58
- Elements of 58
- Network Planning 58
- Elements of Network Planning 60
- Chapter 3 70
- Estimating Network 70
- Performance 70
- 3.1 Overview 72
- 3.2 Factors for Planning 74
- Data Master 5 4 8 8 82
- Data Slave 4 4 8 8 82
- Program Master 1 4 8 8 82
- Program Slave 1 4 8 8 82
- BP85 Bridge Plus Queueing 83
- Planning Loading 100
- Originating 100
- Node Throughput 103
- Figure 37 Node Throughput 103
- Addresses below the drop-out 108
- Addresses above the drop-out 108
- Times Calculated 109
- Normal Transaction Time 109
- Calculations 110
- Chapter 4 131
- Documenting the Network 131
- MODBUS PLUS NETWORK 135
- NODE PLANNING WORKSHEET 135
- Top of W orksheet 136
- Network Topology Area 136
- TOPOLOGY PLANNING WORKSHEET 137
- LEGEND : 137
- 4.5 Estimating Cable Lengths 138
- Network Planning W orksheet 140
- Cable Routing W orksheet 140
- Materials Summary W orksheet 140
- 1. SITE LABELING : 141
- 1. NETWORK DEVICES : 141
- Site Labeling 142
- Trunk Cable and Taps 143
- Drop Cables 143
- Device Type 143
- NETWORK PLANNING WORKSHEET 144
- 4.9 Cable Routing W orksheet 145
- W orksheet Grid Areas 146
- Dual-cable Networks 148
- Network Devices 148
- MATERIALS SUMMARY WORKSHEET 150
- Chapter 5 151
- Installing the Network Cable 151
- 5.3 Before You Start 154
- 5.4 Routing the Cables 155
- 5.5 Mounting the Taps 157
- TERMINAL 159
- 5.7 Connecting the Drop Cable 160
- 5.8 Grounding 162
- 5.9 Labeling 163
- Chapter 6 166
- Connecting an RR85 166
- Repeater 166
- 6.1 Mounting Methods 167
- 6.2 Mounting Dimensions 168
- 6.3 Installing the Repeater 169
- Connecting an RR85 Repeater 170
- RR85 Repeater Specifications 173
- Chapter 7 174
- Connecting a BP85 174
- Bridge Plus 174
- 7.1 Mounting Methods 175
- 7.1.3 Brid g e Plus Models 176
- Top V iew 177
- Rear Panel V iew 177
- Connecting a BP85 Bridge Plus 178
- A C/DC Models 181
- DC/DC M odels 181
- 7.5.3 Before You Apply Power 182
- 7.7 Applying Power 184
- Appendix A 190
- Modbus Plus Transaction 190
- Elements 190
- ALL TIMING IS IN MILLISECONDS 194
- (R) = READ, (W) = WRITE 194
- DATA LENGTH IS 100 REGISTERS 194
- Preamble 195
- Opening Flag 195
- Broadcast Address 195
- MAC/LLC Data 196
- Frame Check Sequence 196
- Closing Flag 196
- Destination Address 197
- Modbus command 199
- Modbus Frame (Modified) 201
- Appendix B 202
- Message Routing 202
- 190 Message Routing 203
- Programmable Controllers 204
- HostBased Network Adapters 204
- Bridge Multiplexers 204
- 192 Message Routing 205
- 194 Message Routing 207
- 1 ... 64 207
- 70 ... 79 207
- 80 ... 255 208
- 196 Message Routing 209
- Modbus Address Map 209
- Silent Master port. A 210
- B .4.1 Routing Examples 211
- Appendix C 213
- Planning W orksheets 213
- C .1 Using the W orksheets 214
- 204 Planning W orksheets 216
- 206 Planning W orksheets 218
- 208 Planning W orksheets 220
- 210 Planning W orksheets 222
- 212 Planning W orksheets 224
- Installing Custom Cable 225
- D .1 Overview 226
- D .3 Before You Start 228
- D .4 Routing the Cable 229
- Before You Start . Remove 234
- Figure 94 Replacing the Cap 236
- Checking W iring Continuity 237
- Trim the W ires 237
- Installing the Cable Tie 238
- Installing 239
- Connectors W ith the Tool 239
- 3.0 IN (7.5 CM) 240
- TOP SIDE 241
- (COVER REMOVED) 241
- D .8 Grounding 246
- D .9 Labeling 247
- Glossary 250
- MAC and LLC 252
- Distributed I /O 252
- DIO Adapter 252
- 244 Glossary 253
- Input, and Specific Output 257
- 240 Index 261
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