Danfoss FCM 300 Series Design Manual page 77

Commands master slave:
Bit no.
15 14 13 12 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 text
Reply slave master:
Bit no.
15 14 13 12 Reply
0 0 0 0 No reply
0 0 0 1 Parameter value transferred (word)
0 0 1 0 Parameter value transferred
(double word)
0 1 1 1 Command cannot be executed
1 1 1 1 Text transferred
If the command cannot be executed, the slave will
send this reply (0111) and give the following error
message in the parameter value:
Error code
(reply 0111) Error message
0 The parameter number used does not
exist
1 There is no write access to the
parameter called
2 The data value exceeds the parameter
limits
3 The used sub-index does not exist
4 The parameter is not of the array type
5 The data type does not match the
parameter called
17 Data change in the parameter called is
not possible in the present mode of the
FC motor. E.g. some parameters can
only be changed when the motor has
stopped
130 There is no bus access to the
parameter called
131 Data change is not possible because
factory Setup has been selected
MG.03.B6.02 - VLT is a registered Danfoss trademark
FCM 300 Series
Parameter number (PNU)
Bits no. 0-10 are used for transmitting parameter
numbers. The function of a given parameter can be
seen from the parameter description in chapter 8.
PKE IND
Index
Index is used together with the parameter number for
read/write access to parameters of the array type
(par. 615, 616 and 617).
Parameter value (PWE)
PKE IND
The parameter value depends on the command
given. If the master wants a parameter (read), it does
not care about the PWE block value. If a parameter is
changed by the master (write), the new value is
transferred in the PWE block. If the slave replies to a
parameter request (read command), the present
parameter value is transferred to the PWE block.
The transferred value corresponds to the figures given
in the parameter descriptions in chapter 8. E.g.
parameter 101, where [1] corresponds to Constant
torque, [2] corresponds to Variable torque: low, etc.
However, parameters with data type 9 (text string)
are excepted, as this text is transferred as an ASCII
text string. When a text string is transferred (read),
the telegram length is variable, since the texts have
different lengths. The telegram length is stated in the
2nd byte of the telegram, called LGE, see page 73.
Parameters 621-634 (nameplate data) have data type
9 (text string).
Data types supported by the VLT frequency converter
Data type
3
4
5
6
7
9
Unsigned means there is no sign included in the
telegram.
PWE
PWE
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
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