7.4.1 Content of a Character (byte) 89
7.4.2 Message Structure 89
7.4.3 Message Length (LGE) 89
7.4.4 Adjustable Frequency Drive Address (ADR) 89
7.4.5 Data Control Byte (BCC) 89
7.4.6 The Data Field 90
7.4.7 The PKE Field 91
7.4.8 Parameter Number (PNU) 91
7.4.9 Index (IND) 91
7.4.10 Parameter Value (PWE) 92
7.4.11 Data Types Supported by the Adjustable Frequency Drive 92
7.4.12 Conversion 92
7.4.13 Process Words (PCD) 92
7.5 Examples
92
7.6 Modbus RTU Overview
93
7.6.1 Assumptions 93
7.6.2 What the User Should Already Know 93
7.6.3 Modbus RTU Overview 93
7.6.4 Adjustable Frequency Drive with Modbus RTU 94
7.7 Network Configuration
94
7.8 Modbus RTU Message Framing Structure
94
7.8.1 Adjustable Frequency Drive with Modbus RTU 94
7.8.2 Modbus RTU Message Structure 95
7.8.3 Start/Stop Field 95
7.8.4 Address Field 95
7.8.5 Function Field 95
7.8.6 Data Field 95
7.8.7 CRC Check Field 96
7.8.8 Coil Register Addressing 96
7.8.9 How to Control the Adjustable Frequency Drive 98
7.8.10 Function Codes Supported by Modbus RTU 98
7.8.11 Modbus Exception Codes 98
7.9 How to Access Parameters
99
7.9.1 Parameter Handling 99
7.9.2 Storage of Data 99
7.9.3 IND 99
7.9.4 Text Blocks 99
7.9.5 Conversion Factor 99
Contents Design Guide
MG18C522 Danfoss A/S © Rev. 2014-01-14 All rights reserved.
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