
Contents
870 USE 101 00 V.2.2
vii
Part II Communication Ports ............................................................ 75
Chapter 4 Using the Modbus Ports ...................................................... 77
Section 4.1 Modbus Port 1 ................................................................................................ 78
Overview ......................................................................................................... 78
Modbus Port 1 ................................................................................................ 79
Cable Accessories for Modbus Port 1 ............................................................ 82
Section 4.2 Modbus Port 2 ................................................................................................ 85
Overview ......................................................................................................... 85
Modbus Port 2 ................................................................................................ 86
Four-Wire Cabling Schemes for Modbus RS485 Networks ........................... 89
Two-Wire Cabling Schemes for Modbus RS485 Networks ............................ 92
Cable for Modbus RS485 Networks .............................................................. 95
Connectors for Modbus RS485 Networks ...................................................... 98
Terminating Devices for Modbus RS485 Networks ...................................... 100
Pinouts for Modbus RS485 Networks ........................................................... 101
Chapter 5 Using the I/OBus Port ........................................................ 107
How I/OBus Works ....................................................................................... 108
Guidelines for I/OBus Networks ................................................................... 109
I/OBus Accessories ...................................................................................... 111
Chapter 6 Using the Modbus Plus Ports ............................................ 115
Modbus Plus Features for Momentum ......................................................... 116
Two Types of Modbus Plus Networks .......................................................... 117
Standard Cabling Schemes .......................................................................... 119
Cluster Mode Cabling Schemes ................................................................... 121
Cable Accessories for Modbus Plus Networks ............................................. 125
Pinouts and Wiring Diagrams for Modbus Plus Networks ............................ 128
Modbus Plus Addresses ............................................................................... 132
Peer Cop ...................................................................................................... 134
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