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VLT is a registered Danfoss trade mark MG.10.P2.22
Table of Contents
Overview
Introduction ............................................................................................. 4
About This Manual .................................................................................. 4
Assumptions ........................................................................................... 4
What You Should Already Know............................................................. 4
Modbus Overview .................................................................................... 5
Pre-installation Option Card and Drive Settings
Modbus RTU Option Card Baud Rate and Parity Settings .................... 7
Modbus RTU Option Card Address Settings.......................................... 8
VLT Parameter Settings .......................................................................... 8
Installation of Modbus Option Card
Modbus RTU Option Card Environmental Requirements...................... 9
Installation ............................................................................................... 9
Status LEDs............................................................................................. 13
Option Card Operability Loop Back Test ............................................... 13
Network Configuration
Remote Terminal Unit ............................................................................. 14
Modbus Message Structure ................................................................... 14
Translation from Modbus RTU Protocol to FC Protocol ....................... 16
Memory Mapping .................................................................................... 17
Message Translation Examples .............................................................. 20
Exception Codes
Exception Code Tables............................................................................ 24
Appendix A
Supported Modbus Function Codes ...................................................... 25
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