Parameter commands masterslave
Bit no.
15
14
13
12 Parameter command
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
Response slavemaster
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 gives the following fault report in the
parameter value (PWE):
Response (0111) Fault report
0
The parameter number used
does not exist
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 exist
4
The parameter is not the array type
5
The data type does not match the
defined parameter
17
Data change in the defined para-
meter is not possible in the frequency
converter's present mode.
Certain parameters can only be changed
when the motor is turned off
130
There is no bus access to the
defined parameter
131
Data change is not possible because
factory Setup is selected
Parameter number (PNU)
Bits no. 0-10 are used to transfer parameter numbers. The relevant pa-
rameter's function is defined in the parameter description in the section
entitled
Programming
.
Index
Index is
used together with the parameter number to read/write-access parame-
ters that have an index, e.g. parameter 615
Error code
. The index is
made up of 2 bytes, one lowbyte and one highbyte, but only the lowbyte
is used as an index.
Example - Index:
The first error code (index [1]) in parameter 615
Error code
must be read.
PKE = 1267 Hex (read parameter 615
Error code
.)
IND = 0001 Hex - Index no. 1.
The frequency converter will respond in the parameter value block (PWE)
with a fault code value from 1 - 99. See
Summary of Warnings and
Alarms
to identify the fault code.
Parameter value (PWE)
The parameter value block consists of 2 words (4 bytes), and the value
depends on the defined command (AK). If the master prompts for a pa-
rameter value, the PWE block does not contain a value.
If you wish the master to change a parameter value (write), the new value
is written in the PWE block and sent to the slave.
If the 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. parameter 001
Language
where [0] corresponds to
English
, and [3]
corresponds to
Danish
, the data value is selected by entering the value
in the PWE block. See
Example - Selecting a data value
.
Via serial communication it is only possible to read parameters that have
data type 9 (text string). Parameter 621 - 635
Nameplate data
is data
type 9. For example, in parameter 621
Unit type
it is possible to read the
unit size and mains voltage range.
When a text string is transferred (read) the length of the telegram is var-
iable, as the texts are of different lengths. The telegram length is defined
in the telegram's second byte, known as LGE.
To be able to read a text via the PWE block the parameter command (AK)
must be set to 'F' Hex.
The index character is used to indicate whether it is a read or write com-
mand.
In a read command the index must have the following format:
Some frequency converters have parameters to which a text may be
written. To be able to write a text via the PWE block the parameter com-
mand (AK) must be set to 'F' Hex.
For a write command the text must have the following format:
VLT® Decentral FCD
3 Programming
MG.04.B8.02 - VLT is a registered Danfoss trademark
71
3
Summary of Contents for VLT Decentral FCD 300
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