Specifications

Bus adress
Bus register
1
PLC Register Content Access Description
0 1 40001 Reserved Reserved for Legacy Drives VLT 5000 and VLT 2800
1 2 40002 Reserved Reserved for Legacy Drives VLT 5000 and VLT 2800
2 3 40003 Reserved Reserved for Legacy Drives VLT 5000 and VLT 2800
3 4 40004 Free
4 5 40005 Free
5 6 40006 Modbus conf Read/Write TCP only. Reserved for Modbus TCP (p12-28 and 12-29 -
store in Eeprom etc.)
6 7 40007 Last error code Read only Error code recieved from parameter database, refer to
WHAT 38295for details
7 8 40008 Last error register Read only Address of register with which last error occurred, refer
to WHAT 38296 for details
8 9 40009 Index pointer Read/Write Sub index of parameter to be accessed. Refer to WHAT
38297 for details
9 10 40010 FC par. 0-01 Dependent on
parameter access
Parameter 0-01 (Modbus Register = 10 parameter
number
20 bytes space reserved pr parameter in Modbus Map
19 20 40020 FC par. 0-02 Dependent on
parameter access
Parameter 0-02
20 bytes space reserved pr parameter in Modbus Map
29 30 40030 FC par. xx-xx Dependent on
parameter access
Parameter 0-03
20 bytes space reserved pr parameter in Modbus Map
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.
RS-485 Installation and Set... VLT HVAC Basic Drive Design Guide
MG.18.C2.02 - VLT
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