Danfoss VLT Design Manual page 4

Contents
7.4 Examples
7.4.1 Writing a Parameter Value
7.4.2 Reading a Parameter Value
7.5 Modbus RTU Overview
7.5.1 Assumptions
7.5.2 What the User Should Already Know
7.5.3 Modbus RTU Overview
7.5.4 Frequency Converter with Modbus RTU
7.5.5 Frequency Converter with Modbus RTU
7.6 Modbus RTU Message Framing Structure
7.6.1 Frequency Converter with Modbus RTU
7.6.2 Modbus RTU Message Structure
7.6.3 Start/Stop Field
7.6.4 Address Field
7.6.5 Function Field
7.6.6 Data Field
7.6.7 CRC Check Field
7.6.8 Coil Register Addressing
7.6.9 How to Control the Frequency Converter
7.6.10 Function Codes Supported by Modbus RTU
7.6.11 Modbus Exception Codes
7.7 How to Access Parameters
7.7.1 Parameter Handling
7.7.2 Storage of Data
7.7.3 IND
7.7.4 Text Blocks
7.7.5 Conversion Factor
7.7.6 Parameter Values
7.8 Examples
7.8.2 Force/Write Single Coil (05 HEX)
7.8.3 Force/Write Multiple Coils (0F HEX)
7.8.4 Read Holding Registers (03 HEX)
7.8.5 Preset Single Register (06 HEX)
7.8.6 Preset Multiple Registers (10 HEX)
7.9 FC Control Profile
8 General Specifications and Troubleshooting
8.1 General Specifications
8.2 Efficiency
8.5 Special Conditions
8.6 Alarm and Status Messages
®
VLT Refrigeration Drive Design Guide
®
MG16G102 - VLT is a registered Danfoss trademark
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