Parameter Number (Pnu); Index (Ind); Parameter Value (Pwe) - Danfoss VLT AutomationDrive FC 300 Design Manual

RS-485 Installation and Set...
Bits no. 12-15 transfer parameter commands from master
to slave and return processed slave responses to the
master.
Bit no. Parameter command
15 14 13 12
0 0 0 0 No command
0 0 0 1 Read parameter value
0 0 1 0 Write parameter value in RAM (word)
0 0 1 1 Write parameter value in RAM (double
word)
1 1 0 1 Write parameter value in RAM and
EEprom (double word)
1 1 1 0 Write parameter value in RAM and
EEprom (word)
1 1 1 1 Read/write text
Table 10.4 Parameter Commands Master ⇒ Slave
Bit no. Response
15 14 13 12
0 0 0 0 No response
0 0 0 1 Parameter value transferred (word)
0 0 1 0 Parameter value transferred (double
word)
0 1 1 1 Command cannot be performed
1 1 1 1 text transferred
Table 10.5 Response Slave ⇒ Master
If the command cannot be performed, the slave sends this
response:
0111 Command cannot be performed
- and issues the following fault report in the parameter
value (PWE):
PWE low Fault Report
(Hex)
0 The parameter number used does not exit
1 There is no write access to the defined parameter
2 Data value exceeds the parameter's limits
3 The sub index used does not exit
4 The parameter is not the array type
5 The data type does not match the defined
parameter
11 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
82 There is no bus access to the defined parameter
83 Data change is not possible because factory setup
is selected
Table 10.6
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VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW

10.6.8 Parameter Number (PNU)

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

10.6.9 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.

10.6.10 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.
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".
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