FCM 300 Series
MG.03.B6.2G - VLT is a registered Danfoss trademark
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.
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)
The parameter value depends on the command
given. If the leader wants a parameter (read), it does
not care about the PWE block value. If a parameter
is changed by the leader (write), the new value is
transferred in the PWE block. If the follower 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. 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.
Parameters 621-634 (nameplate data) have data
type 9 (text string).
Commands leader➝follower:
Bit no.
15 14 13 12 Command
0000No command
0001Read parameter value
0010Write parameter value in RAM
(word)
0011Write parameter value in RAM
(double word)
1101Write parameter value in RAM
and EEPROM (double word)
1110Write parameter value in RAM
and EEPROM (word)
1111Read text
Reply follower➝leader:
Bit no.
15 14 13 12 Reply
0000No reply
0001Parameter value transferred (word)
0010Parameter value transferred
(double word)
0111Command cannot be executed
1111Text transferred
If the command cannot be executed, the follower
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 FCM 300. 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
PKE IND PWE
PKE
IND PWE
Data types supported by the FCM 300 unit
Data type Description
3 Integer 16
4 Integer 32
5 Unsigned 8
6 Unsigned 16
7 Unsigned 32
9 Text string
Unsigned means there is no sign included in the
telegram.
Serial communication
15-5
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