Modicon Modbus Plus Network Planning and Installation Guide

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Modbus Plus Transaction Elements Transaction Timing Elements Token Holding Time Worst Case Timing Examples Each node holds the network token for a minimum length of time if it has no transactions. The minimum token time is approximately 530 microseconds. The token will be held for a longer time depending upon the quantity and size of pending transactions. Typical times are shown in the charts below. Each chart shows the types of transactions the device can handle, how many concurrent transactions are available, and the times required to process single and multiple paths. Times are shown for small and large size transactions. All times are in milliseconds. Note: The token holding times shown in the right column are worst-case times, with all of the deviceís paths active, with all paths moving the full amount of data, and with full queueing. With proper network design, these times should not occur in practice. The only types of transactions that you should consider for calculating the loading on a properly-designed network are the data master paths and data slave paths, with occasional queueing. You should plan your network and application programming to avoid the worstcase times. Use the formulas (see p. 75) to predict response times under various loading conditions. See the guidelines (see p. 63) for designing your network to avoid or minimize queuing in your application. controllers Transaction Type Two Registers 100 Registers Available Transactions One Transactio n All Transactions One Transaction MSTR DM path 4 1.4 5.6 3.0 12.0 DS path 4 1.4 5.6 3.0 12.0 Dequeue transaction to slave path 4 1.4 5.6 3.0 12.0 PM path 1 1.4 1.4 3.0 3.0 PS path 1 1.4 1.4 3.0 3.0 Totals 8.4 21.0 18.0 45.0 All Transaction s 162 890 USE 100 00 November 2004
SA85 and SM85 network adapters Transaction Type BP85 bridge plus devices Modbus Plus Transaction Elements Two Registers 125 Registers Available Transactions One Transaction All Transaction s One Transaction DM path 8 1.4 11.2 3.4 27.2 DS path 8 1.4 11.2 3.4 27.2 dequeue transaction to slave path 8 1.4 11.2 3.4 27.2 PM path 8 1.4 11.2 3.4 27.2 PS path 8 1.4 11.2 3.4 27.2 Totals 7.0 56.0 17.0 136.0 Transaction Type Two Registers 125 Registers Available Transactions One Transactio n All Transactions One Transaction All Transaction s All Transaction s DM path 8 1.4 11.2 3.4 27.2 DS path 8 1.4 11.2 3.4 27.2 dequeue transaction to slave path 8 1.4 11.2 3.4 27.2 PM path 8 1.4 11.2 3.4 27.2 PS path 8 1.4 11.2 3.4 27.2 Totals 7.0 56.0 17.0 136.0 890 USE 100 00 November 2004 163
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31003525.03 Modicon Modbus Plus Net
Page 3 and 4:
Table of Contents Safety Informatio
Page 5 and 6:
Chapter 7 Connecting a BP85 Bridge
Page 7 and 8:
Important Information Safety Inform
Page 9 and 10:
At a Glance About the Book Document
Page 11 and 12:
At a Glance Introducing the Modbus
Page 13 and 14:
Bridging Networks Introducing the M
Page 15 and 16:
Introducing the Modbus Plus Network
Page 17 and 18:
Overview of the Physical Network In
Page 19 and 20:
Page 21 and 22:
Network Option Modules Introducing
Page 23 and 24:
Terminal Block I/O (TIO) Modules In
Page 25 and 26:
Typical Network Adapter Application
Page 27 and 28:
Page 29 and 30:
Point to Point Message Transactions
Page 31 and 32:
Designing for Process Speed Introdu
Page 33 and 34:
Using Peer Cop Peer Cop Transaction
Page 35 and 36:
A Peer Cop Example Other References
Page 37 and 38:
Using RR85 Repeaters Expanding Dual
Page 39 and 40:
Joining Modbus Plus Networks How th
Page 41 and 42:
Using the Bridge Plus Introducing t
Page 43 and 44:
Modbus Configurations Introducing t
Page 45 and 46:
RS232 and RS485 Configurations Intr
Page 47 and 48:
At a Glance Elements of Network Pla
Page 49 and 50:
Preparing a Network Plan Elements o
Page 51 and 52:
Modbus Plus Drop Cables Elements of
Page 53 and 54:
Adding Service Connectors Dual-Cabl
Page 55 and 56:
At a Glance Estimating Network Perf
Page 57 and 58:
Estimating Network Performance Esti
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Factors for Planning Estimating Net
Page 61 and 62:
Factors That Affect Performance Han
Page 63 and 64:
Communication Paths and Queuing Est
Page 65 and 66:
Reading and Writing with the MSTR E
Page 67 and 68:
A Sample MSTR Communication Estimat
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Getting and Clearing Statistics Loc
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Reading and Writing Global Data Pas
Page 73 and 74:
Modbus Port Data Path Handling Unde
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Formula for Calculating Rotation Es
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Estimating Network Performance Guid
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Grouping Nodes Logically for Increa
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Estimating Specific Input and Speci
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Latency Formulas Estimating Network
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Estimating Network Performance Time
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Estimating Network Performance Time
Page 89 and 90:
Adding or Deleting Nodes Estimating
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Guidelines for a Single Network Usi
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Consistency in Node Addressing Remo
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Guidelines for Multiple Networks Es
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Using Multiple Bridges Between Netw
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Estimating Network Performance The
Page 101 and 102:
At a Glance Documenting the Network
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Worksheets for Network Planning Doc
Page 105 and 106:
Facility/Area: Network Number: Node
Page 107 and 108:
Documenting the Network Layout Use
Page 109 and 110:
Reviewing Your Topology Plan Docume
Page 111 and 112: Facility/Area: Network Number: Cabl
Page 113 and 114: Trunk Cables and Taps Documenting t
Page 115 and 116: Cable Routing Worksheet Documenting
Page 117 and 118: Facility/Area: Network Number 1 Cab
Page 119 and 120: Documenting the Network Layout Netw
Page 121 and 122: At a Glance Installing the Network
Page 123 and 124: Tools and Test Equipment Required I
Page 125 and 126: Routing the Cables Installing the N
Page 127 and 128: Mounting the Taps Installing the Ne
Page 129 and 130: Cable Entry and Jumpers (Taps at En
Page 131 and 132: Connecting the Drop Cables Connecti
Page 133 and 134: Grounding Installing the Network Ca
Page 135 and 136: Checking the Cable Installation Ins
Page 137 and 138: At a Glance Connecting an RR85 Repe
Page 139 and 140: Mounting Dimensions Connecting an R
Page 141 and 142: Connecting Power Connecting an RR85
Page 143 and 144: Reading the Network Indicators Over
Page 145 and 146: at a Glance Connecting a BP85 Bridg
Page 147 and 148: Dimensions (Panel/Shelf Models) Ove
Page 149 and 150: Setting the Modbus Plus Addresses C
Page 151 and 152: Before You Apply Power Connecting a
Page 153 and 154: Applying Power Connecting a BP85 Br
Page 155 and 156: Connecting a BP85 Bridge Plus � T
Page 157 and 158: BP85 Bridge Plus Specifications Ove
Page 159 and 160: At a Glance Appendices Overview Thi
Page 161: At a Glance Modbus Plus Transaction
Page 165 and 166: 0.5 -1.5 transfer command to peer p
Page 167 and 168: The Message Format ⎯ MAC Level Mo
Page 169 and 170: LLC Fields The message contains the
Page 171 and 172: At a Glance Message Routing Overvie
Page 173 and 174: Bridge Multiplexers Message Routing
Page 175 and 176: Controller Bridge Mode Routing Mess
Page 177 and 178: Bridge Multiplexer Routing Modbus A
Page 179 and 180: Routing Examples The figure below i
Page 181 and 182: Message Routing If masters A, B, an
Page 183 and 184: Using The Worksheets Planning Works
Page 185 and 186: Notes: Below is the notes worksheet
Page 195 and 196: At a Glance Installing Custom Cable
Page 197 and 198: Tools and Test Equipment Required I
Page 199 and 200: Routing the Cable Installing Custom
Page 201 and 202: Installing Connectors on Dual-Cable
Page 203 and 204: Installing Custom Cable Systems Bef
Page 205 and 206: Determining the Wiring Direction Pl
Page 207 and 208: Completing the Installation Follow
Page 209 and 210: Installing Connectors without the T
Page 211 and 212: Identifying the Terminals Installin
Page 213 and 214:
Installing Custom Cable Systems Not
Page 215 and 216:
Installing Custom Cable Systems Che
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Labeling Installing Custom Cable Sy
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A Glossary acknowledgment An LLC fr
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Glossary DIO Distributed I/O. A Mod
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L Glossary LAN Local area network.
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peer-to-peer communication Glossary
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Glossary transaction The complete a
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Index A AC applying power, 153 AC/D
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connector inline, 196 installing on
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materials summary worksheet, 110, 1
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on a Modbus Plus network, 12, 14, 1
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selecting node address for best thr
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Modicon Modbus Plus Network Planning and Installation Guide

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