Parameter Number (Pnu); Index (Ind); Parameter Value (Pwe); Data Types Supported By The Frequency Converter - Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

RS-485 Installation and Set...
If the command cannot be performed, the slave sends this
response:
0111 Command cannot be performed
PWE low (Hex)
0
1
2
3
4
5
11
82
83
Table 7.6
7 7

7.3.8 Parameter Number (PNU)

Bits no. 0-11 transfer parameter numbers. The function of
the relevant parameter is defined in the parameter
description in the product specific Programming Guide.

7.3.9 Index (IND)

The index is used together with the parameter number to
read/write-access parameters with an index, e.g.
15-30 Alarm Log: Error Code. The index consists of 2 bytes,
a low byte and a high byte.
Only the low byte is used as an index.

7.3.10 Parameter Value (PWE)

The parameter value block consists of 2 words (4 bytes),
and the value depends on the defined command (AK). The
master prompts for a parameter value when the PWE block
contains no value. To change a parameter value (write),
write the new value in the PWE block and send from the
master to the slave.
When a slave responds to a parameter request (read
command), the present parameter value in the PWE block
is transferred and returned to the master. If a parameter
contains not a numerical value but several data options,
e.g. 0-01 Language where [0] corresponds to English, and
[4] corresponds to Danish, select the data value by
entering the value in the PWE block. See Example -
Selecting a data value. Serial communication is only
capable of reading parameters containing data type 9 (text
string).
15-40 FC Type to 15-53 Power Card Serial Number contain
data type 9.
136
VLT Automation Low Harmonic Drive Operating Instructions
Fault Report
The parameter number used does not exit
There is no write access to the defined parameter
Data value exceeds the parameter's limits
The sub index used does not exit
The parameter is not the array type
The data type does not match the defined parameter
Data change in the defined parameter is not possible in the frequency converter's present mode. Certain
parameters can only be changed when the motor is turned off
There is no bus access to the defined parameter
Data change is not possible because factory setup is selected
®
MG34O202 - VLT
- and issues the following fault report in the parameter
value (PWE):
For example, read the unit size and mains voltage range in
15-40 FC Type. When a text string is transferred (read), the
length of the telegram is variable, and the texts are of
different lengths. The telegram length is defined in the
second byte of the telegram, LGE. When using text transfer
the index character indicates whether it is a read or a write
command.
To read a text via the PWE block, set the parameter
command (AK) to 'F' Hex. The index character high-byte
must be "4".
Some parameters contain text that can be written to via
the serial bus. To write a text via the PWE block, set the
parameter command (AK) to 'F' Hex. The index characters
high-byte must be "5".
Read text
Write text
Illustration 7.10
7.3.11 Data Types Supported by the
Frequency Converter
Unsigned means that there is no operational sign in the
telegram.
is a registered Danfoss trademark
PKE IND PWE PWE
high low
Fx xx 04 00
Fx xx 05 00