How To Access Parameters - Danfoss VLT AQUA Drive Design Manual

VLT ® AQUA Drive Design Guide
Exception
data field (decimal)
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 num-
ber) DECIMAL.
7.9.2. Storage of Data
The Coil 65 decimal determines whether data written to the adjustable frequency drive is stored
in EEPROM and RAM (coil 65 = 1), or only in RAM (coil 65 = 0).
7.9.3. IND
The array index is set in Holding Register 9 and used when accessing array parameters.
7.9.4. Text Blocks
Parameters stored as text strings are accessed in the same way as the other parameters. The
maximum text block size is 20 characters. If a read request for a parameter is for more characters
than the parameter stores, the response is truncated. If the read request for a parameter is fewer
characters than the parameter stores, the response is space-filled.
code in Exception code description
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
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7. RS-485 Installation and Set-up
7
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