Danfoss VLT Micro Drive PK18 Design Manual page 74

RS485 Installation and Set-...
8.4.7 The PKE Field
The PKE field contains two subfields: Parameter command
and response (AK) and Parameter number (PNU):
PKE IND
AK PNU
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bits no. 12-15 transfer parameter commands from master
to slave and return processed slave responses to the
master.
Parameter commands master ⇒ slave
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 text
Response slave ⇒master
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
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:
VLT Micro Drive Design Guide
Error code
0
1
2
3
4
PWE PWE
high low
5
6
7
9
11
15
17
18
100
>100
130
131
132
252
253
254
255
8.4.8 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.
8.4.9 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.
8.4.10 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 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 several data options, e.g. 0-01 Language, select
the data value by entering the value in the PWE block.
®
MG02K102 - VLT is a registered Danfoss trademark
FC+ Specification.
Illegal Parameter Number
Parameter cannot be changed.
Upper or lower limit exceeded
Subindex corrupted
No Array
Wrong Data Type
Not used
Not used
Description element not available
No parameter write access
No text available
Not while Running
Other error
No bus access for this parameter
Write to factory set-up not possible
No LCP access
Unknown viewer
Request not supported
Unknown attribute
No error
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