8.4.7 The PKE Field
The PKE field contains two subfields: Parameter command
and response (AK) and Parameter number (PNU):
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
130BB918.10
PKE
IND
PWE
high
PWE
low
AK
PNU
Par
amet
er
commands
and r
eplies
Par
amet
er
number
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:
Error code
FC+ Specification.
0
Illegal Parameter Number
1
Parameter cannot be changed.
2
Upper or lower limit exceeded
3
Subindex corrupted
4
No Array
5
Wrong Data Type
6
Not used
7
Not used
9
Description element not available
11
No parameter write access
15
No text available
17
Not while Running
18
Other error
100
>100
130
No bus access for this parameter
131
Write to factory set-up not possible
132
No LCP access
252
Unknown viewer
253
Request not supported
254
Unknown attribute
255
No error
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.
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