Illustration 4.27 Parameter Commands and Responses (AK)
Bits no. 12-15 are used to transfer control commands from
master to slave and response commands from slave back
to the master.
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
Table 4.7 Parameter Commands
Bit no.
15 14 13 12 Response
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 4.8 Response Commands
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 parameter 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
Table 4.9 Fault Report
Parameter number (PNU)
Bits no. 0-10 are used to transfer parameter numbers.
Parameters are described in chapter 4 Programming.
Index
Index is used with the parameter number to read/write-
access parameters 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 responds in the parameter value
block (PWE) with a fault code value from 1-99. See
chapter 5.2.2 Warnings and Alarm Messages 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 parameter value, the PWE block
does not contain a value.
If the master changes 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.
Programming
Design Guide
108 Danfoss A/S © Rev. May/2014 All rights reserved. MG27E402
44
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