FC 300 Design Guide
How to Program
Parameter number (PNU)
Bits no. 0-10 transfers parameter numbers. The relevant parameter’s function is defined in
the parameter description in the chapter How to Program.
I
ndex
Index is used together with the parameter number
to read/write-access parameters with an index,
e.g. par. 15-30 Error co de. The index consists
of 2 bytes - one lowbyte and one highbyte. Only
the lowbyte is used as an inde x.
Example - Index:
Thefirsterrorcode(index[1])inpar. 15-30
Error Code must be read.
PKE = 15 FA Hex (read par. 15-30 Error C ode.)
IND = 0001 Hex - Index no. 1.
The adjustable frequency drive responds in the
parameter value block (PWE) with a f ault code
value from 1 - 99. See Summary of W arnings
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 parameter value, the PWE block
does not contain a value.
If you want the master to change a parameter value (write), the new value is written
in the PWE blo
ck and sent to the slave.
If the slave responds t o a parameter request (r ead command), the present parameter value
in the PWE block is transferred and returne d to the m aster.
If a parameter
contains not a numerical value but several data options, e.g. p ar. -001 Language
where [0] corresponds to English, and [4] corresponds to Danish, select the data value by ent ering
the value in the PWE block. See Exam ple - S electing a data value.
Via serial communication, it is only possible to read parameters that have data type 9 (text
string).
Par. 15-40 to 15-33 Drive Identification is data type 9. For example, you can read
the unit size and mains voltage range in par. 15-40 FC Type.
When a text s tring is transferred (read), the length of the telegram is variable, and the texts are of different
lengths
. The telegram length is defined in the telegram’s s econd byte, known as LGE.
To read a text via the PWE block, set the parameter command (AK) to "F" Hex.
The index character indicates if the command is
read o
r write. In a read command, the index
must have the shown format:
*
default setting ()display text []value for use in communication via serial c ommunication port
240
MG.33.B
3.22 - VLT is a registered Danfoss trademark
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