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Strany 1 - Modbus Plus Network

ModiconModbus Plus NetworkPlanning and Installation Guide890 USE 100 00 Version 3.0April 1996AEG Schneider Automation, Inc.One High StreetNorth Andove

Strany 2 - Preface iii

890 USE 100 00xii ContentsAppendix AModbus Plus Transaction Elements 171. . . . . . . . . . . . . . . . . . . . . . . . . .A .1 Transaction T iming El

Strany 3

Estimating Network Performance890 USE 100 0085MODBUS PLUS NETWORKCPU1 2 3 4 5 6CPU CPU CPU CPU CPUFigure 36 Predicting Response TimePlanning LoadingOr

Strany 4

86 Estimating Network Performance890 USE 100 00The following steps can be used to calculate the data response time foran MSTR, and the acquisition tim

Strany 5

Estimating Network Performance890 USE 100 00873. Calculate the global data acquisition timeEach unit’s time to receive data from another unit’s Global

Strany 6

88 Estimating Network Performance890 USE 100 003.14 Estimating Throughput (W ith MSTR)Figure 37 shows a graph of the throughput per node as a function

Strany 7

Estimating Network Performance890 USE 100 0089Note that the network’s capacity is 20,000 registers/s. The throughputfor any node is 20,000 registers/s

Strany 8

90 Estimating Network Performance890 USE 100 003.15 Estimating Throughput (W ith Peer Cop)3.15.1 Estimating Total Communication TimeWith Peer Cop comm

Strany 9

Estimating Network Performance890 USE 100 0091The sending node A transmits its Specific Output data, containing PeerCop data to receiving node B. Node

Strany 10 - 890 USE 100 00

92 Estimating Network Performance890 USE 100 003.16 Predicting Node Dropout Latency Time3.16.1 How the Network Handles Node DropoutsAll active nodes m

Strany 11 - Appendix D

Estimating Network Performance890 USE 100 0093Addresses below the drop-outThis general formula is used to calculate the NDOL for each node withan addr

Strany 12

94 Estimating Network Performance890 USE 100 003.17 Estimating Latency for a Small NetworkHere is an example for estimating drop-out latency in a smal

Strany 13 - Contents

Contents890 USE 100 00xiiiAppendix DInstalling Custom Cable Systems 207. . . . . . . . . . . . . . . . . . . . . . . . . . . .D .1 Overview 208. . . .

Strany 14

Estimating Network Performance890 USE 100 0095AbbreviationsTTT(n)Token Transmission Time (for node n)TRT Token Rotation TimeNDOL(n)Node Drop Out Laten

Strany 15

96 Estimating Network Performance890 USE 100 003.18 Estimating Latency for a Large NetworkHere is an example for estimating drop-out latency in a larg

Strany 16 - Related Publications

Estimating Network Performance890 USE 100 0097AbbreviationsTTT(n)Token Transmission Time (for node n)TRT Token Rotation TimeNDOL(n)Node Drop Out Laten

Strany 17 - Introducing the Modbus Plus

98 Estimating Network Performance890 USE 100 003.19 Planning for Ring Join T imeNodes can be connected to the network while it is active, dynamicallyj

Strany 18

Estimating Network Performance890 USE 100 0099join and does not do so, approximately 2 ms must elapse before itsabsence can be assumed and the token p

Strany 19

100 Estimating Network Performance890 USE 100 003.20 Precautions for Hot Standby LayoutsA case exists in which a node can leave the network and rejoin

Strany 20 - NETWORK D

Estimating Network Performance890 USE 100 00101Caution: In the worst-case timing for this event, as much as15 s can be required for the ring to be rec

Strany 21 - 1.2 Network Terminology

102 Estimating Network Performance890 USE 100 003.21 Guidelines for a Single Network3.21.1 Using MSTR FunctionsEach controller on the network should h

Strany 22

Estimating Network Performance890 USE 100 001033.21.2 Using Peer-to-Peer Communication TechniquesUse peer-to-peer passing of data where applicable, ra

Strany 23

104 Estimating Network Performance890 USE 100 003.21.4 Security Considerations in Node AddressingModbus Plus nodes can be addressed within the range 1

Strany 24

890 USE 100 00xiv ContentsIllustrationsFigure 1 Network Overview 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Fig

Strany 25

Estimating Network Performance890 USE 100 001053.21.6 Consistency in Node AddressingUse a consistent method for identifying node addresses. This willf

Strany 26 - Figure 5 Cable Tap Layout

106 Estimating Network Performance890 USE 100 003.21.8 Controlling the Sequencing of MSTR FunctionsWhen you use multiple MSTR functions in a controlle

Strany 27 - Hot Standby Configurations

Estimating Network Performance890 USE 100 001073.21.1 1 Selecting Bridge Multiplexer Port ModesThe four Modbus ports on Bridge Multiplexers can be sep

Strany 28

108 Estimating Network Performance890 USE 100 003.22 Guidelines for Multiple NetworksIf your application’s data rate requirements are not met between

Strany 29 - Hardware Reference Guide

Estimating Network Performance890 USE 100 00109NETWORKANETWORKBDSDMDMDSDSDSDSDSDSDSDSDMDMDMDMDMDMDMDMDMDMDMDMDMDMDSDSDSDSDSDSDSBP85 BRIDGE PLUSFigure

Strany 30 - Figure 10 TIO Module

110 Estimating Network Performance890 USE 100 003.22.2 Using Multiple Bridges Between NetworksIf your application will have heavy traffic between netw

Strany 31

Estimating Network Performance890 USE 100 00111You can plan your application so that high priority messages are passedthrough a dedicated bridge. Desi

Strany 32

112 Estimating Network Performance890 USE 100 003.23 Sample Communications Across NetworksFigure 44 shows two controllers on separate Modbus Plus netw

Strany 33

Estimating Network Performance890 USE 100 00113Step 4 When the peer processor in unit B acquires the token, it sends thedata response to the bridge. T

Strany 34

114 Estimating Network Performance890 USE 100 003.24 A Summary of Network Planning3.24.1 Analyzing Your NeedsAnalyze your application’s data communica

Strany 35

Contents890 USE 100 00xvFigure 31 Sample READ Communication 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 32 Sample GET LOCAL STAT

Strany 36

Estimating Network Performance890 USE 100 00115V Reduce queueing by reducing the number of communications to acontroller node, or by reducing the freq

Strany 37

Documenting the Network Layout890 USE 100 00117Chapter 4Documenting the NetworkLayoutV Documenting Your Network LayoutV Your Planning WorksheetsV Defi

Strany 38

118 Documenting the Network Layout890 USE 100 004.1 Documenting Your Network LayoutYour planning should include the preparation of documents thatdescr

Strany 39

Documenting the Network Layout890 USE 100 001194.2 W orksheets for Network PlanningFive kinds of worksheets are provided in this book to assist you in

Strany 40 - Network I/O Servicing Guide

120 Documenting the Network Layout890 USE 100 004.3 Defining Your Node RequirementsBefore you document your network layout, make a list of yourrequire

Strany 41 - 1.10 Using Peer Cop

Documenting the Network Layout890 USE 100 00121MODBUS PLUS NETWORKNODE PLANNING WORKSHEETFACILITY / AREA :NETWORK NUMBER :PROJECT NAME : DATE :PROJECT

Strany 42 - Receiving Data

122 Documenting the Network Layout890 USE 100 004.4 Topology Planning W orksheetFigure 46 is an example of a completed Topology Planning Worksheet.The

Strany 43 - Figure 14 Peer Cop Example

Documenting the Network Layout890 USE 100 00123MODBUS PLUS NETWORKTOPOLOGY PLANNING WORKSHEETFACILITY / AREA : PROJECT NAME : DATE :PROJECT ENGR : TEL

Strany 44

124 Documenting the Network Layout890 USE 100 004.5 Estimating Cable LengthsAfter defining the network topology, consider the required cable lengthsbe

Strany 45 - 1.1 1 Expanding the Network

Documenting the Network Layout890 USE 100 001254.6 Reviewing Your Topology PlanReview your topology planning worksheet after you estimate the cablelen

Strany 46

890 USE 100 00xvi ContentsFigure 61 RR85 Repeater Rear Panel View 151. . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 62 RR85 Repeater In

Strany 47

126 Documenting the Network Layout890 USE 100 004.7 Detailing the Network Layout4.7.1 Overview of Your Detailed Planning W orksheetsYou have three wor

Strany 48

Documenting the Network Layout890 USE 100 00127MODBUS PLUS NETWORKCABLE ROUTING WORKSHEETFACILITY / AREA :NETWORK NUMBER :SHEET : OFSITES : TOPROJECT

Strany 49

128 Documenting the Network Layout890 USE 100 004.8 Network Planning W orksheetEach network planning worksheet can document up to eight sites. Useaddi

Strany 50

Documenting the Network Layout890 USE 100 00129Trunk Cable and TapsEstimate the length of the cable between sites. Each segment exceptthe first has a

Strany 51

130 Documenting the Network Layout890 USE 100 00MODBUS PLUS NETWORKNETWORK PLANNING WORKSHEETFACILITY / AREA :NETWORK NUMBER :SHEET : OFSITES : TOPROJ

Strany 52

Documenting the Network Layout890 USE 100 001314.9 Cable Routing W orksheetWherever possible, obtain a site layout for your plant facility and use itt

Strany 53

132 Documenting the Network Layout890 USE 100 00and cables. Use a larger scale on another sheet to show the overallnetwork layout.W orksheet Grid Area

Strany 54

Documenting the Network Layout890 USE 100 00133MODBUS PLUS NETWORKCABLE ROUTING WORKSHEETFACILITY / AREA :NETWORK NUMBER :SHEET : OFSITES : TOPROJECT

Strany 55

134 Documenting the Network Layout890 USE 100 004.10 Materials Summary W orksheetWhen your planning of the network layout and cable routing iscomplete

Strany 56

Documenting the Network Layout890 USE 100 00135Trunk Cable and TapsSummarize the amount of cable that will be required. Convert thenetwork cable lengt

Strany 57

Contents890 USE 100 00xviiFigure 91 Preparing the Cable 216. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Figure 92 Plac

Strany 58 - Network Planning

136 Documenting the Network Layout890 USE 100 00MODBUS PLUS NETWORKMATERIALS SUMMARY WORKSHEETFACILITY / AREA :NETWORK NUMBER :PROJECT NAME : DATE :PR

Strany 59

Installing the Network Cable890 USE 100 00137Chapter 5Installing the Network CableV Overview of the Cable InstallationV Tools and Test Equipment Requi

Strany 60 - Elements of Network Planning

138 Installing the Network Cable890 USE 100 005.1 Overview of the Cable InstallationThis chapter describes how to install the network trunk and dropca

Strany 61

Installing the Network Cable890 USE 100 001395.2 Tools and Test Equipment RequiredThe following tools and test equipment are required to install andch

Strany 62

140 Installing the Network Cable890 USE 100 005.3 Before You StartBefore routing the cable you should have a cable routing diagram thatshows:V Site lo

Strany 63

Installing the Network Cable890 USE 100 001415.4 Routing the CablesFigure 51 shows typical cable routing of the network trunk cablebetween tap locatio

Strany 64

142 Installing the Network Cable890 USE 100 00Refer to Figure 51. Route the cable between the site locations of thenode devices. Guidelines for cable

Strany 65

Installing the Network Cable890 USE 100 001435.5 Mounting the TapsBefore mounting each Tap, install the supplied grounding screw andnut into the Tap a

Strany 66

144 Installing the Network Cable890 USE 100 005.6 Connecting the Trunk Cables5.6.1 Cable Entry and Jumpers (Taps at Inline Sites)At each inline site,

Strany 67

Installing the Network Cable890 USE 100 001455.6.3 Connecting the W iresDetailed instructions for making the connections are enclosed in eachtap packa

Strany 68

iv Related Publications890 USE 100 00Related PublicationsRefer to the following publications for further information about theModbus Plus network and

Strany 69

146 Installing the Network Cable890 USE 100 005.7 Connecting the Drop Cable5.7.1 Connecting the Signal W iresDetailed instructions for making the conn

Strany 70 - Performance

Installing the Network Cable890 USE 100 00147CABLETIEO BLUGNDW WOUTER SHIELDGROUNDWIREFigure 57 Drop Cable ConnectionsFigure 58 shows how to connect e

Strany 71

148 Installing the Network Cable890 USE 100 005.8 GroundingAt each tap, ensure that the drop cable’s ground wire is connected tothe tap’s grounding sc

Strany 72 - 3.1 Overview

Installing the Network Cable890 USE 100 001495.9 LabelingAfter the cable is installed, label the cable segments for ease in futuremaintenance of the n

Strany 73

150 Installing the Network Cable890 USE 100 005.10 Checking the Cable InstallationThis section describes how to visually inspect the cable and check i

Strany 74 - 3.2 Factors for Planning

Installing the Network Cable890 USE 100 00151V At each node device connector, check for an open circuit betweenpin 2 (a signal pin) and pin 1 (the out

Strany 75

Connecting an RR85 Repeater890 USE 100 00153Chapter 6Connecting an RR85RepeaterV Mounting MethodsV Mounting DimensionsV Installing the RepeaterV Readi

Strany 76

154 Connecting an RR85 Repeater890 USE 100 006.1 Mounting MethodsAs supplied, the RR85 Repeater’s bottom surface is fitted with pads formounting on a

Strany 77

Connecting an RR85 Repeater890 USE 100 001556.2 Mounting DimensionsMounting dimensions for the Repeater are shown in Figure 60. Thefigure shows the ou

Strany 78

156 Connecting an RR85 Repeater890 USE 100 006.3 Installing the RepeaterCaution: If you are replacing a Repeater on an active ModbusPlus network, the

Strany 79

Introducing the Modbus Plus Network890 USE 100 001Chapter 1Introducing the Modbus PlusNetworkV Introducing the Modbus Plus NetworkV Network Terminolog

Strany 80

Connecting an RR85 Repeater890 USE 100 00157Rear Panel V iewPower cableconnectorPowerswitchModbus Plusport 1 connectorPower selectorplug and fusePower

Strany 81

158 Connecting an RR85 Repeater890 USE 100 00If the cable segments are not labeled, or if you do not have a networklayout diagram, you can still conne

Strany 82 - Program Slave 1 4 8 8

Connecting an RR85 Repeater890 USE 100 001596.4 Reading the Network IndicatorsThe layout of the Repeater indicators is shown in Figure 62.ModbusPlusPo

Strany 83 - BP85 Bridge Plus Queueing

160 Connecting an RR85 Repeater890 USE 100 006.5 RR85 Repeater SpecificationsRR85 Repeater SpecificationsDescription Name RR85 Modbus Plus Network Re-

Strany 84

Connecting a BP85 Bridge Plus890 USE 100 00161Chapter 7Connecting a BP85Bridge PlusV Mounting MethodsV Dimensions (Panel/Shelf Models)V Dimensions (Ra

Strany 85

162 Connecting a BP85 Bridge Plus890 USE 100 007.1 Mounting MethodsBP85 models are available for mounting on a horizontal shelf orvertical panel, or f

Strany 86

Connecting a BP85 Bridge Plus890 USE 100 001637.1.3 Brid g e Plus ModelsP art Number Mounting MethodOperating Power(Nominal)Modbus PlusNetwork CableNW

Strany 87

164 Connecting a BP85 Bridge Plus890 USE 100 007.2 Dimensions (Panel /Shelf Models)Top V iewRear Panel V iew14.08 in (358 mm)12.83 in (326 mm)11.5 in

Strany 88

Connecting a BP85 Bridge Plus890 USE 100 001657.3 Dimensions (Rack Mount Model)Top V iewFrontPanelView19.0 in (483 mm)17.25 in (438 mm)3.47 in(88 mm)1

Strany 89

166 Connecting a BP85 Bridge Plus890 USE 100 007.4 Settin g the Modbus Plus AddressesBefore you apply power to the BP85, you must set the unit’s netwo

Strany 90

2 Introducing the Modbus Plus Network890 USE 100 001.1 Introducing the Modbus Plus Network1.1.1 Modbus Plus ApplicationsModbus Plus is a local area ne

Strany 91

Connecting a BP85 Bridge Plus890 USE 100 00167AddressSwitch Position12345678910111213141516171819202122232425262728293031321 2 3 4 5 6 7 8010101010101

Strany 92

168 Connecting a BP85 Bridge Plus890 USE 100 007.5 Connecting the Power CablesCaution: If y o u are replacing a Bridge Plus on an activenet w ork, the

Strany 93

Connecting a BP85 Bridge Plus890 USE 100 001697.5.3 Before You Apply PowerDo not apply power to the BP85 until you have completed the setup ofthe unit

Strany 94

170 Connecting a BP85 Bridge Plus890 USE 100 007.6 Connecting the Network CablesIf the cables and connectors are not in place, install them as describ

Strany 95

Connecting a BP85 Bridge Plus890 USE 100 001717.7 Applying PowerAfter you have set the address switches to the desired networkaddresses, and have conn

Strany 96

172 Connecting a BP85 Bridge Plus890 USE 100 007.8 Reading the Network IndicatorsThe layout of the Bridge Plus indicators is shown in Figure 67.Modbus

Strany 97

Connecting a BP85 Bridge Plus890 USE 100 00173V One flash/s The Bridge Plus node is offline after just being pow-ered up, or after hearing a message f

Strany 98

174 Connecting a BP85 Bridge Plus890 USE 100 00Modbus PlusNetworkNodeModbus PlusNetworkNode123222Figure 68 Modbus Plus Port Labels

Strany 99

Connecting a BP85 Bridge Plus890 USE 100 001757.10 BP85 Bridge Plus SpecificationsBP85 Bridge Plus S pecifications (Panel/Shelf Models)Description Nam

Strany 100 - Originating

176 Connecting a BP85 Bridge Plus890 USE 100 00BP85 Bridge Plus Specifications (Rack Mount Model)Description Name BP85 Modbus Plus Network BridgePart

Strany 101

Introducing the Modbus Plus Network890 USE 100 003Modbus Plus networked devices, as well as with other devices at theserial ports.1.1.4 Network Exampl

Strany 102

Modbus Plus Transaction Elements890 USE 100 00177Appendix AModbus Plus TransactionElementsV Transaction Timing ElementsV The Message Format  HDLC Lev

Strany 103 - Figure 37 Node Throughput

178 Modbus Plus Transaction Elements890 USE 100 00A .1 Transaction T iming ElementsA .1.1 Token Holding TimeEachnode holds the networktoken for a mini

Strany 104

Modbus Plus Transaction Elements890 USE 100 00179SA85 and SM85 Network AdaptersTwo Registers 125 RegistersTransactionTypeAvailableTransactionsOneTrans

Strany 105

180 Modbus Plus Transaction Elements890 USE 100 00A .1.3 Data Response T imeWhen a node’s application program initiates a transaction, the timerequire

Strany 106

Modbus Plus Transaction Elements890 USE 100 00181ALL TIMING IS APPROXIMATE (NOT TO SCALE)ALL TIMING IS IN MILLISECONDSNOTES(R) = READ, (W) = WRITETRAN

Strany 107

182 Modbus Plus Transaction Elements890 USE 100 00A .2 The Message Format  HDLC LevelMessages appearing on the network contain three levels of protoc

Strany 108 - Addresses above the drop-out

Modbus Plus Transaction Elements890 USE 100 00183MAC/LLC DataThis field specifies the MAC level control packet for tokenrelatedoperations, and contai

Strany 109 - Normal Transaction Time

184 Modbus Plus Transaction Elements890 USE 100 00A .3 The Message Format  MAC LevelAt the Medium Access Control (MAC) level, the network protocoldef

Strany 110 - Calculations

Modbus Plus Transaction Elements890 USE 100 00185Source AddressThe address of the node originating the message, in the range of 1 to64.MAC Function Co

Strany 111

186 Modbus Plus Transaction Elements890 USE 100 00A .4 The Message Format  LLC LevelAt the Logical Link Control (LLC) level, the message contains the

Strany 112

Preface iii890 USE 100 00PrefaceThe data and illustrations found in this book are not binding. Wereserve the right to modify our products in line with

Strany 113

4 Introducing the Modbus Plus Network890 USE 100 00BP85BRIDGEPLUSRR85REPEATERHOST DEVICENETWORKADAPTERBM85BRIDGEMULTIPLEXERMODBUS OR CUSTOMSERIAL DEVI

Strany 114

Modbus Plus Transaction Elements890 USE 100 00187A .4.1 LLC FieldsThe message contains the following LLC level fields:Master Output PathOne byte ident

Strany 115

188 Modbus Plus Transaction Elements890 USE 100 00For messages to a single Modbus slave device connected to a BridgeMultiplexer port: each nonzero by

Strany 116

Message Routing890 USE 100 00189Appendix BMessage RoutingV The Modbus Plus Message Routing PathV Modbus Address ConversionV Controller Bridge Mode Rou

Strany 117

190 Message Routing890 USE 100 00B .1 The Modbus Plus Message Routing PathA single Modbus Plus network can have up to 64 addressable nodedevices, with

Strany 118

Message Routing890 USE 100 00191Programmable ControllersFor programmable controllers, the last nonzero byte in the messagerouting specifies the netwo

Strany 119

192 Message Routing890 USE 100 00B .2 Modbus Address ConversionModbus devices use addresses of one byte in the range 1 ... 255.Modbus Plus nodes are a

Strany 120

Message Routing890 USE 100 00193RESERVEDRESERVED01646569707980255DIRECTATTACHADDRESSEXPLICITATTACHADDRESSIMPLICITATTACHADDRESSRESERVEDRESERVED01646579

Strany 121

194 Message Routing890 USE 100 00B .3 Controller Bridge Mode RoutingIf a Modbus message is received at the Modbus port of a controller thatis set to b

Strany 122

Message Routing890 USE 100 00195The routing path pointed to by the Modbus address is applied to themessage. Each path is five bytes in length:4x Free-

Strany 123

196 Message Routing890 USE 100 00B .4 Bridge Multiplexer RoutingModbus Address MapIf a Modbus message is received at a BM85 Modbus port, the address(1

Strany 124

Introducing the Modbus Plus Network890 USE 100 0051.2 Network TerminologyThe following terms are used in this guide to describe networkelements:Networ

Strany 125

Message Routing890 USE 100 001971 ... 64If the address is in the range 1 ... 64 (Direct Attach Address), themessage is routed to the specific node add

Strany 126

198 Message Routing890 USE 100 00B .4.1 Routing ExamplesFigure 77 illustrates message routing across two networks.MODBUS PLUS NETWORK (UP TO 64 NODES)

Strany 127

Message Routing890 USE 100 00199Here are examples of routing between peer, master, and slave devices.From To Routing PathCPU A (Primary) Slave A 5 2 0

Strany 128

Planning W orksheets890 USE 100 00201Appendix CPlanning W orksheetsThis appendix provides blank worksheets that you can use for planningyour Modbus Pl

Strany 129

202 Planning W orksheets890 USE 100 00C .1 Using the W orksheetsUse these worksheets to plan the layout of your network and tocoordinate the ordering

Strany 130

Planning W orksheets890 USE 100 00203MODBUS PLUS NETWORKNODE PLANNING WORKSHEETFACILITY / AREA :NETWORK NUMBER :PROJECT NAME : DATE :PROJECT ENGR : TE

Strany 131 - Documenting the Network

204 Planning W orksheets890 USE 100 00NOTES :Figure 79 Node Planning: Notes

Strany 132

Planning W orksheets890 USE 100 00205MODBUS PLUS NETWORKTOPOLOGY PLANNING WORKSHEETFACILITY / AREA : PROJECT NAME : DATE :PROJECT ENGR : TEL :MAINTENA

Strany 133

206 Planning W orksheets890 USE 100 00NOTES :Figure 81 Topology Planning: Notes

Strany 134

Planning W orksheets890 USE 100 00207MODBUS PLUS NETWORKNETWORK PLANNING WORKSHEETFACILITY / AREA :NETWORK NUMBER :SHEET : OFSITES : TOPROJECT NAME :

Strany 135 - NODE PLANNING WORKSHEET

6 Introducing the Modbus Plus Network890 USE 100 00Node Any device that is physically connected to the Modbus Plus cable.Figure 2 shows a network with

Strany 136 - Network Topology Area

208 Planning W orksheets890 USE 100 00NOTES :Figure 83 Network Planning: Notes

Strany 137 - LEGEND :

Planning W orksheets890 USE 100 00209MODBUS PLUS NETWORKCABLE ROUTING WORKSHEETFACILITY / AREA :NETWORK NUMBER :SHEET : OFSITES : TOPROJECT NAME : DAT

Strany 138 - 4.5 Estimating Cable Lengths

210 Planning W orksheets890 USE 100 00NOTES :Figure 85 Cable Routing: Notes

Strany 139

Planning W orksheets890 USE 100 0021 1MODBUS PLUS NETWORKMATERIALS SUMMARY WORKSHEETFACILITY / AREA :NETWORK NUMBER :PROJECT NAME : DATE :PROJECT ENGR

Strany 140 - Materials Summary W orksheet

212 Planning W orksheets890 USE 100 00NOTES :Figure 87 Materials Summary: Notes

Strany 141 - 1. NETWORK DEVICES :

Installing Custom Cable Systems890 USE 100 00213Appendix DInstalling Custom CableSystemsV OverviewV Tools and Test Equipment RequiredV Before You Star

Strany 142 - Site Labeling

214 Installing Custom Cable Systems890 USE 100 00D .1 OverviewThis chapter describes how to install the network cable system withoutthe use of Modicon

Strany 143 - Device Type

Installing Custom Cable Systems890 USE 100 00215D .2 Tools and Test Equipment RequiredAn installation tool (Modicon part number ASMBPL001) is availa

Strany 144 - NETWORK PLANNING WORKSHEET

216 Installing Custom Cable Systems890 USE 100 00D .3 Before You StartBefore routing the cable you should have a cable routing diagram thatshows:V Sit

Strany 145 - 4.9 Cable Routing W orksheet

Installing Custom Cable Systems890 USE 100 00217D .4 Routing the CableFigure 88 shows typical cable drops to several network node devicesand a service

Strany 146 - W orksheet Grid Areas

Introducing the Modbus Plus Network890 USE 100 0071.3 Overview of the Logical NetworkNetwork nodes are identified by addresses assigned by the user. E

Strany 147

218 Installing Custom Cable Systems890 USE 100 00V At each drop, allow sufficient cable for a service loop and strainreliefs.V At each drop, provide a

Strany 148 - Network Devices

Installing Custom Cable Systems890 USE 100 00219D .5 Installing Connectors on Dual-Cable RunsAt each inline device site, an Inline Connector (AS-MBKT-

Strany 149

220 Installing Custom Cable Systems890 USE 100 00D .6 Installing Connectors W ith the ToolA tool is available from Modicon (part number ASMBPL001) f

Strany 150 - MATERIALS SUMMARY WORKSHEET

Installing Custom Cable Systems890 USE 100 002211 2 3 1 2 3TERMINATINGCONNECTORASMBKT185INLINECONNECTORASMBKT085INSTALL ATEND POINTSINSTALL ATINLI

Strany 151 - Installing the Network Cable

222 Installing Custom Cable Systems890 USE 100 00D .6.3 Preparing the CableRemove three inches (7.5 cm) of the cable’s outer jacket and shields asshow

Strany 152

Installing Custom Cable Systems890 USE 100 00223D .6.5 Determining the W iring DirectionThe wires must be inserted into the connector in the proper di

Strany 153

224 Installing Custom Cable Systems890 USE 100 00D .6.7 Replacing the CapCarefully replace the cap as shown in Figure 94 below. Make sure thecap is pr

Strany 154 - 5.3 Before You Start

Installing Custom Cable Systems890 USE 100 00225D .6.9 Completing the InstallationChecking W iring ContinuityOpen the tool, and remove the connector a

Strany 155 - 5.4 Routing the Cables

226 Installing Custom Cable Systems890 USE 100 00Installing the Cable TieUsing one of the cable ties supplied with the connector, tie the cabletightly

Strany 156

Installing Custom Cable Systems890 USE 100 00227D .7 Installing Connectors W ithout the ToolIf you are using the Modbus Plus connector installation to

Strany 157 - 5.5 Mounting the Taps

8 Introducing the Modbus Plus Network890 USE 100 00Figure 4 shows the token sequences in two networks joined by aBridge Plus.NODEBRIDGEPLUSNETWORK 1NO

Strany 158

228 Installing Custom Cable Systems890 USE 100 00You will also need to know which type of network device (type ofModicon 984 controller or other devic

Strany 159 - TERMINAL

Installing Custom Cable Systems890 USE 100 00229D .7.4 Identifying the TerminalsRefer to Figure 99. Remove the screw that secures the connector cap.Re

Strany 160 - 5.7 Connecting the Drop Cable

230 Installing Custom Cable Systems890 USE 100 00123CABLE TO LEFTFOR984385, 485CABLE TO RIGHTFOR984685, 785WIRETERMINALTOWIREPRESS EACHWHITE WIRE AN

Strany 161

Installing Custom Cable Systems890 USE 100 00231If you are connecting an inline site, refer to Figure 101. Connect thesecond cable to the connector as

Strany 162 - 5.8 Grounding

232 Installing Custom Cable Systems890 USE 100 00D .7.8 Completing the InstallationChecking W iring ContinuityLocate pins 1, 2, and 3 of the connector

Strany 163 - 5.9 Labeling

Installing Custom Cable Systems890 USE 100 00233Installing the Cable TieUsing one of the cable ties supplied with the connector, tie the cabletightly

Strany 164

234 Installing Custom Cable Systems890 USE 100 00D .8 GroundingAll three conductors of the cable (signal wires and shield) shouldremain isolated from

Strany 165

Installing Custom Cable Systems890 USE 100 00235D .9 LabelingAfter the cable is installed, label the cable segments for ease in futuremaintenance of t

Strany 166 - Repeater

236 Installing Custom Cable Systems890 USE 100 00D .10 Checking the Cable InstallationThis section describes how to visually inspect the cable and che

Strany 167 - 6.1 Mounting Methods

Installing Custom Cable Systems890 USE 100 00237V At any connector, measure the resistance between pins 2 and 3 (thesignal pins). Measure this at the

Strany 168 - 6.2 Mounting Dimensions

Introducing the Modbus Plus Network890 USE 100 0091.4 Overview of the Physical NetworkThe network bus consists of twisted-pair shielded cable that is

Strany 169 - 6.3 Installing the Repeater

Glossary890 USE 100 00241GlossaryacknowledgementAn LLC frame that indicates that a data frame has been receivedcorrectly.addressOn a network, the iden

Strany 170 - Connecting an RR85 Repeater

242 Glossary890 USE 100 00Bridge PlusA Modicon device that interconnects two Modbus Plus networks.broadbandA network communications method supporting

Strany 171

Glossary890 USE 100 00243packet to the Physical Layer for transmission. Its two logicalentities are the MAC and LLC sublayers. See MAC and LLC .DIOSee

Strany 172

244 Glossary890 USE 100 00A code that is used to determine whether a frame was receivedcorrectly.

Strany 173 - RR85 Repeater Specifications

Glossary890 USE 100 00245frame descriptorA part of the host computer’s buffer structure that linkstransmitted or received data frames to appropriate p

Strany 174 - Bridge Plus

246 Glossary890 USE 100 00LANLocal Area Network. An interconnection of devices in which datais transferred without the use of public communications se

Strany 175 - 7.1 Mounting Methods

Glossary890 USE 100 00247megabits per second. The network medium is shieldedtwisted-pair cable.Modbus IIAn industrial networking system that uses toke

Strany 176 - 7.1.3 Brid g e Plus Models

248 Glossary890 USE 100 00Four kinds of Peer Cop communication can be transacted duringeach token pass: see Global Input, Global Output, SpecificInput

Strany 177 - Rear Panel V iew

Glossary890 USE 100 00249segmentThe combination of: a continuous length of trunk cable connectinga pair of taps; the two taps; and the drop cables bet

Strany 178 - Connecting a BP85 Bridge Plus

250 Glossary890 USE 100 00systemA set of hardware devices and their associated software capable ofperforming the functions of information processing a

Strany 179

10 Introducing the Modbus Plus Network890 USE 100 00NETWORKTRUNKCABLENETWORKTRUNKCABLEDROPCABLETO NODETAP SHOWNWITHCOVER OPENCABLETIETERMINATIONJUMPER

Strany 180

Index890 USE 100 00239IndexBBM85 Bridge Multiplexer, description, 16BP85 Bridge Plus, description, 16bridgingModbus Plus networks, 32to serial devices

Strany 181 - DC/DC M odels

890 USE 100 00240 IndexNnetwork, deterministic timing, 23nodeaccess method, 18adding or deleting, 93connections, 8defined, 5types, 10node dropoutexamp

Strany 182 - 7.5.3 Before You Apply Power

Introducing the Modbus Plus Network890 USE 100 00111.5 Major Components of the Network1.5.1 Programmable ControllersModicon controllers connect direct

Strany 183

12 Introducing the Modbus Plus Network890 USE 100 00Note: The address exchange can cause a momentary delay incommunication with the new primary unit w

Strany 184 - 7.7 Applying Power

Introducing the Modbus Plus Network890 USE 100 00131.5.3 DIO Drop AdaptersThe DIO Drop Adapter mounts in a housing at a remote site,communicating over

Strany 185

Contents890 USE 100 00vContentsChapter 1Introducing the Modbus Plus Network 1. . . . . . . . . . . . . . . . . . . . . . .1.1 Introducing the Modbus P

Strany 186

14 Introducing the Modbus Plus Network890 USE 100 001.5.4 Available Backplanes for DIO ApplicationsModicon backplanes are available in sizes from 2 ..

Strany 187

Introducing the Modbus Plus Network890 USE 100 00151.5.6 Network Adapters for Host ComputersAdapters are available for connecting host computers to th

Strany 188

16 Introducing the Modbus Plus Network890 USE 100 00Typical network adapter applications include:V User interfacesV Control, monitoring, and reporting

Strany 189

Introducing the Modbus Plus Network890 USE 100 00171.5.7 BM85 Bridge MultiplexerThe BM85 Bridge Multiplexer provides connection to Modbus Plus forup t

Strany 190 - Elements

18 Introducing the Modbus Plus Network890 USE 100 001.5.9 RR85 RepeaterThe RR85 Repeater allows you to place more than 32 nodes on thenetwork and to i

Strany 191

Introducing the Modbus Plus Network890 USE 100 00191.6 How Nodes Access the Network1.6.1 How Your Application’ s Layout Affects Node AccessWhen the ne

Strany 192

20 Introducing the Modbus Plus Network890 USE 100 001.6.3 Point to Point Message TransactionsWhile a node holds the token, it sends its application me

Strany 193

Introducing the Modbus Plus Network890 USE 100 0021Global database applications include time synchronization, rapidnotification of alarm conditions, a

Strany 194 - DATA LENGTH IS 100 REGISTERS

22 Introducing the Modbus Plus Network890 USE 100 001.7 Error Checking and RecoveryWhen a node sends a data message, it expects an immediateacknowledg

Strany 195 - Broadcast Address

Introducing the Modbus Plus Network890 USE 100 00231.8 Designing for Process SpeedFigure 12 is an example of a hierarchical approach using Bridge Plus

Strany 196 - Closing Flag

890 USE 100 00vi ContentsChapter 1Introducing the Modbus Plus Network (Continued):1.11 Expanding the Network 28. . . . . . . . . . . . . . . . . . . .

Strany 197 - Destination Address

24 Introducing the Modbus Plus Network890 USE 100 001.9 Designing for Deterministic I/O ServicingFigure 13 illustrates a network designed for determin

Strany 198

Introducing the Modbus Plus Network890 USE 100 00251.10 Using Peer Cop1.10.1 Peer Cop TransactionsPoint to point data can be transacted while a node h

Strany 199 - Modbus command

26 Introducing the Modbus Plus Network890 USE 100 00Receiving DataNodes can be configured to receive two kinds of Peer Cop data:V Global Input Up to 3

Strany 200

Introducing the Modbus Plus Network890 USE 100 00271.10.2 A Peer Cop ExampleFigure 14 shows a network with three nodes that are handling PeerCop data

Strany 201 - Modbus Frame (Modified)

28 Introducing the Modbus Plus Network890 USE 100 00Node 7 has not been configured to receive Global Input from node 2,and ignores it. The node receiv

Strany 202 - Message Routing

Introducing the Modbus Plus Network890 USE 100 00291.1 1 Expanding the Network1.1 1.1 Linear ExpansionThe simplest network configuration consists of t

Strany 203 - 190 Message Routing

30 Introducing the Modbus Plus Network890 USE 100 001.1 1.2 Using RR85 RepeatersIf your network requires more than 1500 ft (450 m) of cable, or moreth

Strany 204 - Bridge Multiplexers

Introducing the Modbus Plus Network890 USE 100 00311.1 1.3 Expanding Dual-cable NetworksOn dual-cable networks, repeaters must be placed between the s

Strany 205 - 192 Message Routing

32 Introducing the Modbus Plus Network890 USE 100 00NDNDNDND1500 ft CABLE MAX.1500 ftCABLEMAX.1500 ftCABLEMAX.1500 ft CABLE MAX.ND = NODE DEVICERR = R

Strany 206

Introducing the Modbus Plus Network890 USE 100 00331.12 Joining Modbus Plus Networks1.12.1 How the Bridge Plus OperatesThe BP85 Bridge Plus device con

Strany 207 - 70 ... 79

Contents890 USE 100 00viiChapter 2Elements of Network Planning 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.1 An Overview of Netwo

Strany 208 - 80 ... 255

34 Introducing the Modbus Plus Network890 USE 100 00If a data message intended for a remote node is received at one of theBridge’s ports, the Bridge s

Strany 209 - Modbus Address Map

Introducing the Modbus Plus Network890 USE 100 0035When the first Bridge (22) receives the original message, it examinesthe routing field and determin

Strany 210 - Silent Master port. A

36 Introducing the Modbus Plus Network890 USE 100 00The types of devices used in your application determine how manyModbus Plus networks you can join.

Strany 211 - B .4.1 Routing Examples

Introducing the Modbus Plus Network890 USE 100 00371.13 Bridging Modbus Plus and Serial Devices1.13.1 How the Bridge Multiplexer OperatesThe BM85 Brid

Strany 212

38 Introducing the Modbus Plus Network890 USE 100 00Modbus master devices connected to the Bridge Multiplexer can accessany controller node on the Mod

Strany 213 - Planning W orksheets

Introducing the Modbus Plus Network890 USE 100 0039MODBUS PLUS NETWORK (UP TO 64 NODES)BM85BRIDGEMULTIPLEXERCPUIBM PCORJ478MODBUS= MODBUS PORTCOMPATIB

Strany 214 - C .1 Using the W orksheets

40 Introducing the Modbus Plus Network890 USE 100 00The application can then be downloaded using a utility supplied withthe development tools. The dow

Strany 215

Introducing the Modbus Plus Network890 USE 100 0041Figure 24 summarizes the layout of port devices in a typical BM85user-programmed application.MODBUS

Strany 216 - 204 Planning W orksheets

Elements of Network Planning890 USE 100 0043Chapter 2Elements ofNetwork PlanningV An Overview of Network PlanningV Defining the Network ComponentsV De

Strany 217

44 Elements of Network Planning890 USE 100 002.1 An Overview of Network PlanningYou should consider the following factors in the layout of your Modbus

Strany 218 - 206 Planning W orksheets

890 USE 100 00viii ContentsChapter 3Estimating Network Performance 51. . . . . . . . . . . . . . . . . . . . . . . . . . . .3.1 Overview 52. . . . . .

Strany 219

Elements of Network Planning890 USE 100 0045worksheets. You can make photocopies of them for use in documentingyour network.

Strany 220 - 208 Planning W orksheets

46 Elements of Network Planning890 USE 100 002.1.1 Preparing a Network PlanThis chapter provides a focus for planning your Modbus Plus networkrequirem

Strany 221

Elements of Network Planning890 USE 100 0047V Bridge Plus You must define a network node address for each ofthe Bridge Plus device’s two network ports

Strany 222 - 210 Planning W orksheets

48 Elements of Network Planning890 USE 100 002.2 Defining the Network ComponentsFigure 25 summarizes the components of the network cable system.TRUNK

Strany 223

Elements of Network Planning890 USE 100 00492.2.1 Modbus Plus Trunk CableCable specified for Modbus Plus trunk use is available from Modicon asthe fol

Strany 224 - 212 Planning W orksheets

50 Elements of Network Planning890 USE 100 002.2.3 Modbus Plus TapA tap is required at each site on the trunk cable to provide connectionsfor the trun

Strany 225 - Installing Custom Cable

Elements of Network Planning890 USE 100 00512.2.5 Modbus Plus Network GroundingEach tap has a grounding screw for connection to the site panel ground.

Strany 226 - D .1 Overview

52 Elements of Network Planning890 USE 100 002.3 Defining the Network Layout2.3.1 Component LocationsThe maximum cable length allowed for the network

Strany 227

Elements of Network Planning890 USE 100 0053V In addition to the minimum separation, if the cable must crosspower wiring carrying over 480 volts, it m

Strany 228 - D .3 Before You Start

54 Elements of Network Planning890 USE 100 00V Between nodes 2 ... 4, the difference between cables A and B is also600 ft (180 m). This exceeds the ma

Strany 229 - D .4 Routing the Cable

Contents890 USE 100 00ix3.16 Predicting Node Dropout Latency Time 86. . . . . . . . . . . . . . . . . . . . . . . . . . .3.16.1 How the Network Handle

Strany 230

Estimating Network Performance890 USE 100 0055Chapter 3Estimating NetworkPerformanceV OverviewV Factors for PlanningV How Devices Interact on the Netw

Strany 231

56 Estimating Network Performance890 USE 100 00V A Summary of Network Planning

Strany 232

Estimating Network Performance890 USE 100 00573.1 OverviewThis chapter describes the major factors you should consider as youplan the layout of your M

Strany 233

58 Estimating Network Performance890 USE 100 00Your Options You can plan your network application as a single network, with alinear arrangement of nod

Strany 234 - Before You Start . Remove

Estimating Network Performance890 USE 100 00593.2 Factors for PlanningWhen you plan an industrial communications strategy that willintegrate various c

Strany 235

60 Estimating Network Performance890 USE 100 003.2.3 Transaction RequirementsConsider the types and quantities of message transactions that mustoccur

Strany 236 - Figure 94 Replacing the Cap

Estimating Network Performance890 USE 100 00613.3 How Devices Interact on the NetworkMultiple data transfer and programming operations can occurconcur

Strany 237 - Trim the W ires

62 Estimating Network Performance890 USE 100 00V Computer B in a programming or load/record/verify operation withcontroller 3V Plant personnel accessi

Strany 238 - Installing the Cable Tie

Estimating Network Performance890 USE 100 00633.4 Factors That Affect Performance3.4.1 Handling Multiple OperationsThe time that is required for a nod

Strany 239 - Connectors W ith the Tool

64 Estimating Network Performance890 USE 100 00Two additional operations are occurring on the network. Computer B isin a programming or load/record/ve

Strany 240 - 3.0 IN (7.5 CM)

890 USE 100 00x ContentsChapter 4Documenting the Network Layout 111. . . . . . . . . . . . . . . . . . . . . . . . . . .4.1 Documenting Your Network L

Strany 241 - (COVER REMOVED)

Estimating Network Performance890 USE 100 0065written by the incoming data, and cleared by a subsequent scan), or byusing transaction counters or othe

Strany 242

66 Estimating Network Performance890 USE 100 003.5 Communication Paths and QueueingWith multiple devices processing messages asynchronously on thenetw

Strany 243

Estimating Network Performance890 USE 100 00673.5.2 Path QuantitiesThe following paths are available in the various types of Modbus Plusdevices:CPU BM

Strany 244

68 Estimating Network Performance890 USE 100 00BP85 Bridge Plus QueueingMessages which must pass through multiple bridges will be queued (ifnecessary)

Strany 245

Estimating Network Performance890 USE 100 0069Transactions are handled in this way to prevent excessive delaysbetween requests and responses in your a

Strany 246 - D .8 Grounding

70 Estimating Network Performance890 USE 100 003.6 Reading and W riting with the MSTRThe MSTR instruction is a ladder logic function that provides acc

Strany 247 - D .9 Labeling

Estimating Network Performance890 USE 100 0071For example, in a data Read or Write operation, the Control Blocklayout is as follows:Register Content4x

Strany 248

72 Estimating Network Performance890 USE 100 003.7 A Sample MSTR CommunicationEvery Modbus Plus device has a peer processor that controls networkcommu

Strany 249

Estimating Network Performance890 USE 100 0073Step 4 At the end of the ladder logic scan in unit A, the incoming transac-tions are handled. The transa

Strany 250 - Glossary

74 Estimating Network Performance890 USE 100 003.8 Getting and Clearing Statistics3.8.1 Local Device StatisticsWhen you issue commands to Get Local St

Strany 251

Contents890 USE 100 00xiChapter 6Connecting an RR85 Repeater 147. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6.1 Mounting Methods 148.

Strany 252 - DIO Adapter

Estimating Network Performance890 USE 100 0075The time required to process the complete communication would be:Time Range Average T ime W orst Case T

Strany 253 - 244 Glossary

76 Estimating Network Performance890 USE 100 003.9 Reading and W riting Global Data3.9.1 Passing Global Data Between NodesUp to 32 registers of global

Strany 254

Estimating Network Performance890 USE 100 0077Step 1 When the peer processor in unit A acquires the network token, ittransmits any other application m

Strany 255

78 Estimating Network Performance890 USE 100 003.10 Loading Effects in Your ApplicationDuring the application, each node on the network can have a dif

Strany 256

Estimating Network Performance890 USE 100 0079During dequeueing at the destination, the receiving node will requestthe command again from the originat

Strany 257 - Input, and Specific Output

80 Estimating Network Performance890 USE 100 003.1 1 Predicting Token Rotation TimeFigure 35 shows a graph of token timing as a function of the networ

Strany 258

Estimating Network Performance890 USE 100 0081The token rotation times shown in the figure are for data transactions,with no queueing at the destinati

Strany 259

82 Estimating Network Performance890 USE 100 003.12 Formula for Calculating Token RotationThe formula for calculating the average token rotation time

Strany 260

Estimating Network Performance890 USE 100 0083For example.consider twocases in which an MSTR is enabled everyscan, and the scan time is 20 ms.V Faster

Strany 261 - 240 Index

84 Estimating Network Performance890 USE 100 003.13 Predicting MSTR Response TimeWhen you have calculated the average token rotation time on thenetwor

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