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24 Introducing the Modbus Plus Network
890 USE 100 00
1.9 Designing for Deterministic I/O Servicing
Figure 13 illustrates a network designed for deterministic timing of I/O
processes. The I/O network consists only of the CPU and I/O drops.
A User Interface (UI) device is connected to a separate network at the
NOM port.
CPU NOMPS
I/O
MODULES
D
I
O
TIO TIO
UI
MODBUS
PLUS
2
3 4 5
TIO
6
MODBUS
PLUS
2
3
I/O
MODULES
Figure 13 Network for Deterministic I/O T iming
For truly deterministic timing of I/O servicing, reserve the CPU’s
network for the nodes used in I/O servicing only. If you require a User
Interface or other non-I/O device in your application, connect it to a
separate network at a NOM port.
Guidelines for designing networks for servicing I/O processes, with
estimates of network performance, are provided in the Modbus Plus
Network I/O Servicing Guide.
- 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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