The Pke Field; Parameter Number (Pnu); Index (Ind); Parameter Value (Pwe) - Danfoss VLT AQUA Drive FC 202 Design Manual

RS-485 Installation and Set...

7.4.7 The PKE Field

The PKE field contains 2 sub fields:
•
Parameter command and response AK
•
Parameter number PNU
AK
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
7 7
Illustration 7.10 PKE Field
Bits no. 12–15 transfer parameter commands from master
to follower and return processed follower responses to the
master.
Bit no.
15 14 13
0 0 0
0 0 0
0 0 1
0 0 1
1 1 0
1 1 1
1 1 1
Table 7.3 Parameter Commands Master⇒Follower
Bit no.
15 14 13
0 0 0
0 0 0
0 0 1
0 1 1
1 1 1
Table 7.4 Response Follower⇒Master
152
Design Guide
PKE IND PWE
high
PNU
Parameter command
12
0 No command
1 Read parameter value
0 Write parameter value in RAM (word)
1 Write parameter value in RAM (double
word)
1 Write parameter value in RAM and
EEprom (double word)
0 Write parameter value in RAM and
EEprom (word)
1 Read/write text
Response
12
0 No response
1 Parameter value transferred (word)
0 Parameter value transferred (double
word)
1 Command cannot be performed
1 text transferred
Danfoss A/S © Rev. 06/2014 All rights reserved.
If the command cannot be performed, the follower sends
this response:
0111 Command cannot be performed
- and issues the following fault report in the parameter
value (PWE):
PWE low
(hex)
PWE
low
0
1
2
3
4
5
11
82
83
Table 7.5 Fault Report

7.4.8 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.

7.4.9 Index (IND)

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

7.4.10 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 follower.
When a follower 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,
for example, 0-01 Language [0] English, and [4] Danish,
select the data value by entering the value in the PWE
Fault report
The parameter number used does not exist
There is no write access to the defined parameter
Data value exceeds the parameter limits
The sub index used does not exist
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 present mode of the frequency
converter. 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
MG20Z202