Bus
address
Bus
register
1)
PLC
register
Content
Access
Description
0
1
40001
Reserved
–
Reserved for legacy frequency converters VLT
®
5000 and
VLT
®
2800.
1
2
40002
Reserved
–
Reserved for legacy frequency converters VLT
®
5000 and
VLT
®
2800.
2
3
40003
Reserved
–
Reserved for legacy frequency converters VLT
®
5000 and
VLT
®
2800.
3
4
40004
Free
–
–
4
5
40005
Free
–
–
5
6
40006
Modbus configuration
Read/Write
TCP only. Reserved for Modbus TCP
(
parameter 12-28 Store Data Values
and
parameter 12-29 Store Always
- stored in, for example,
EEPROM).
6
7
40007
Last fault code
Read only
Fault code received from parameter database, refer to
WHAT 38295 for 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
Parameter 0-01 Language
Dependent on
parameter
access
Parameter 0-01 Language
(Modbus register = 10
parameter number)
20 bytes space reserved for parameter in Modbus map.
19
20
40020
Parameter 0-02 Motor Speed
Unit
Dependent on
parameter
access
Parameter 0-02 Motor Speed Unit
20 bytes space reserved for parameter in Modbus map.
29
30
40030
Parameter 0-03 Regional
Settings
Dependent on
parameter
access
Parameter 0-03 Regional Settings
20 bytes space reserved for parameter in Modbus map.
Table 7.18 Address/Registers
1) Value written in the Modbus RTU telegram must be 1 or less than the register number. For example, Read Modbus Register 1 by writing value 0
in the telegram.
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 telegram.
7.8.10 Function Codes Supported by
Modbus RTU
Modbus RTU supports use of the following function codes
in the function field of a telegram.
Function
Function code (hex)
Read coils
1
Read holding registers
3
Write single coil
5
Write single register
6
Write multiple coils
F
Write multiple registers
10
Get comm. event counter
B
Report slave ID
11
Table 7.19 Function Codes
RS485 Installation and Set-...
VLT
®
Compressor Drive CDS 803
60
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MG18N202
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