Danfoss VLT FC51, Design Manual, Page: 6 / 94

8.4.12 Conversion 70
8.5 Examples 70
8.6 Modbus RTU Overview 71
8.6.1 Assumptions 71
8.6.2 What the User Should Already Know 71
8.6.3 Modbus RTU Overview 71
8.6.4 Frequency Converter with Modbus RTU 72
8.7 Network Configuration
72
8.8 Modbus RTU Message Framing Structure
72
8.8.1 Frequency Converter with Modbus RTU 72
8.8.2 Modbus RTU Message Structure 72
8.8.3 Start/Stop Field 73
8.8.4 Address Field 73
8.8.6 Data Field 73
8.8.7 CRC Check Field 73
8.8.8 Coil Register Addressing 73
8.8.9 How to Control the Frequency Converter 75
8.8.10 Function Codes Supported by Modbus RTU 75
8.8.11 Modbus Exception Codes 76
8.9 How to Access Parameters 76
8.9.1 Parameter Handling 76
8.9.2 Storage of Data 76
8.9.3 IND (Index) 76
8.9.4 Text Blocks 76
8.9.6 Parameter Values 76
8.10 Examples 77
8.10.1 Read Coil Status (01 hex) 77
8.10.2 Force/Write Single Coil (05 hex) 77
8.10.3 Force/Write Multiple Coils (0F hex) 78
8.10.4 Read Holding Registers (03 hex) 78
8.10.5 Preset Single Register (06 hex) 78
8.10.6 Preset Multiple Registers (10 hex) 79
8.11 FC Drive Control Profile
79
8.11.1 Control Word According to FC Profile (8-10 Protocol = FC profile) 79
8.11.2 Status Word According to FC Profile (STW) ( 8-30 Protocol = FC profile) 81
8.11.3 Bus Speed Reference Value 82
9 Specifications
83
Index
89
Contents
VLT
®
Micro Drive FC 51 Design Guide
4 MG02K302 - Rev. 2013-12-03