Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 74

RS-485 Installation and Set...
Bus adress Bus register PLC Register Content
1
0 1 40001
1 2 40002
2 3 40003
3 4 40004
4 5 40005
5 6 40006
6 7 40007
7 8 40008
8 9 40009
9 10 40010
19 20 40020
29 30 40030
1
Value written in Modbus RTU telegram must be one or less than register number. E.g. Read Modbus Register 1 by writing
value 0 in telegram.
* Used to specify the index number to be used when accessing an indexed parameter.
7.8.9 How to Control the Frequency Converter
This section describes codes which can be used in the function and data fields of a Modbus RTU message.
VLT HVAC Basic Drive Design Guide
Access
Reserved
Reserved
Reserved
Free
Free
Modbus conf Read/Write
Last error code Read only
Last error register Read only
Index pointer Read/Write
FC par. 0-01 Dependent on
parameter access
FC par. 0-02 Dependent on
parameter access
FC par. xx-xx Dependent on
parameter access
®
MG.18.C2.02 - VLT is a registered Danfoss trademark
Description
Reserved for Legacy Drives VLT 5000 and VLT 2800
Reserved for Legacy Drives VLT 5000 and VLT 2800
Reserved for Legacy Drives VLT 5000 and VLT 2800
TCP only. Reserved for Modbus TCP (p12-28 and 12-29 -
store in Eeprom etc.)
Error code recieved from parameter database, refer to
WHAT 38295for details
Address of register with which last error occurred, refer
to WHAT 38296 for details
Sub index of parameter to be accessed. Refer to WHAT
38297 for details
Parameter 0-01 (Modbus Register = 10 parameter
number
20 bytes space reserved pr parameter in Modbus Map
Parameter 0-02
20 bytes space reserved pr parameter in Modbus Map
Parameter 0-03
20 bytes space reserved pr parameter in Modbus Map
7 7
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