FC101 Design Guide

7.4.8 Parameter Number (PNU) 88
7.4.9 Index (IND) 88
7.4.10 Parameter Value (PWE) 88
7.4.11 Data Types Supported by the Frequency Converter 89
7.4.12 Conversion 89
7.4.13 Process Words (PCD) 89
7.5 Examples
89
7.5.1 Writing a Parameter Value 89
7.5.2 Reading a Parameter Value 90
7.6 Modbus RTU Overview
90
7.6.1 Introduction 90
7.6.2 Overview 90
7.6.3 Frequency Converter with Modbus RTU 91
7.7 Network Conguration
91
7.8 Modbus RTU Message Framing Structure
91
7.8.1 Introduction 91
7.8.2 Modbus RTU Telegram Structure 91
7.8.3 Start/Stop Field 92
7.8.4 Address Field 92
7.8.5 Function Field 92
7.8.6 Data Field 92
7.8.7 CRC Check Field 92
7.8.8 Coil Register Addressing 92
7.8.9 Access via PCD write/read 94
7.8.10 How to Control the Frequency Converter 95
7.8.11 Function Codes Supported by Modbus RTU 95
7.8.12 Modbus Exception Codes 95
7.9 How to Access Parameters
96
7.9.1 Parameter Handling 96
7.9.2 Storage of Data 96
7.9.3 IND (Index) 96
7.9.4 Text Blocks 96
7.9.5 Conversion Factor 96
7.9.6 Parameter Values 96
7.10 Examples
96
7.10.1 Read Coil Status (01 hex) 97
7.10.2 Force/Write Single Coil (05 hex) 97
7.10.3 Force/Write Multiple Coils (0F hex) 97
Contents
VLT
®
HVAC Basic Drive FC 101
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