How To Access Parameters - Danfoss VLT AQUA Design Manual

7. RS-485 Installation and Set-up
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
Function
Diagnostics
7
7.8.11. Database Error Codes
In the event of an error, the following error codes may appear in the data field of a response message. For a full explanation of the structure of an
exception (i.e. error) response, please refer to the section
Error Code in data field (deci-
mal)
00
01
02
03
04
05
06
07
11
17
18
64
65
66
67
130
131

7.9. How to Access Parameters

7.9.1. Parameter Handling
The PNU (Parameter Number) is translated from the register address contained in the Modbus read or write message. The parameter number is translated
to Modbus as (10 x parameter number) DECIMAL.
140
Function Code
1 hex
3 hex
5 hex
6 hex
F hex
10 hex
B hex
11 hex
Function Code Sub-function code
8 1
2
10
11
12
13
14
Modbus RTU Message Framing Structure, Function Field.
The parameter number does not exit
There is no write access to the parameter
The data value exceeds the parameter limits
The sub-index in use does not exit
The parameter is not of the array type
The data type does not match the parameter called
Only reset
Not changeable
No write access
Data change in the parameter called is not possible in the present mode
Other error
Invalid data address
Invalid message length
Invalid data length or value
Invalid function code
There is no bus access to the parameter called
Data change is not possible because factory set-up is selected
MG.20.N3.02 - VLT
Sub-function
Restart communication
Return diagnostic register
Clear counters and diagnostic register
Return bus message count
Return bus communication error count
Return bus exception error count
Return slave message count
Database Error Code description
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VLT AQUA Drive Design Guide