How To Control The Frequency Converter; Function Codes Supported By Modbus Rtu - Danfoss VLT Micro Drive FC 51 Design Manual

RS485 Installation and Set-...
Bus Bus PLC
address 1) register
register
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
Table 8.18 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.
8.8.9 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.
MG02K402
Design Guide
Content Access
Reserved
Reserved
Reserved
Free
Free
Modbus configuration Read/Write
Last fault code Read only
Last error register Read only
Index pointer Read/Write
Parameter 0-01 Language Dependent on
parameter
access
Parameter 0-02 Motor Speed Dependent on
Unit parameter
access
Parameter 0-03 Regional Dependent on
Settings parameter
access
Danfoss A/S © 01/2016 All rights reserved.
Description
Reserved for legacy frequency converters VLT
–
®
VLT 2800.
Reserved for legacy frequency converters VLT
–
®
VLT 2800.
Reserved for legacy frequency converters VLT
–
®
VLT 2800.
–
–
TCP only. Reserved for Modbus TCP
(parameter 12-28 Store Data Values and
parameter 12-29 Store Always - stored in, for example,
EEPROM).
Fault code received from parameter database, refer to
WHAT 38295 for 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 Language (Modbus register = 10
parameter number)
20 bytes space reserved for parameter in Modbus map.
Parameter 0-02 Motor Speed Unit
20 bytes space reserved for parameter in Modbus map.
Parameter 0-03 Regional Settings
20 bytes space reserved for parameter in Modbus map.
8.8.10 Function Codes Supported by
Modbus RTU
Modbus RTU supports use of the following function codes
in the function field of a telegram.
Function
Read coils
Read holding registers
Write single coil
Write single register
Write multiple coils
Write multiple registers
Get comm. event counter
Report slave ID
Table 8.19 Function Codes
®
5000 and
®
5000 and
®
5000 and
–
–
Function code (hex)
1
3
5
6
F
10
B
11
75
8 8