3.4.7 The PKE Field
The PKE field contains 2 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
Illustration 3.10 PKE Field
Bits number 12–15 transfer parameter commands from
master to slave and return processed slave responses to
the master.
Parameter commands master
⇒
slave
Bit number
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
Table 3.5 Parameter Commands
Response slave
⇒
master
Bit number
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 3.6 Response
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:
Fault code
+ Specification
0
Illegal parameter number
2
Upper or lower limit exceeded
3
Subindex corrupted
4
No array
5
Wrong data type
6
Not used
7
Not used
17
Not while running
18
Other error
23
Parameter database is busy
100
>100
130
No bus access for this parameter
132
No LCP access
255
No error
Table 3.7 Slave Report
3.4.8 Parameter Number (PNU)
Bit numbers 0–11 transfer parameter numbers. The
function of the relevant parameter is defined in the
parameter description in
.
3.4.9 Index (IND)
The index is used with the parameter number to read/
write access parameters with an index, for example,
parameter 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.
3.4.10 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, for example
, select the data value by entering
the value in the PWE block. Serial communication is only
RS485 Installation and Set-...
Programming Guide
MG03N202
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