Danfoss VLT AutomationDrive FC 361 Series Design Manual page 84

Appendix
PWE block. Serial communication is only capable of
reading parameters containing data type 9 (text string).
Parameter 15-40 FC Type to parameter 15-53 Power Card
Serial Number contain data type 9.
For example, read the unit size and mains voltage range in
parameter 15-40 FC Type. When a text string is transferred
(read), the length of the telegram is variable, and the texts
are of different lengths. The telegram length is defined in
nd
the 2 byte of the telegram, LGE. When using text transfer,
the index character indicates whether it is a read or a write
command.
To read a text via the PWE block, set the parameter
command (AK) to F hex. The index character high-byte
must be 4.
Some parameters contain text that can be written via the
fieldbus. To write a text via the PWE block, set the
parameter command (AK) to F hex. The index characters
high-byte must be 5.
Illustration 11.11 PWE
11 11
11.5.11 Data Types Supported
Unsigned means that there is no operational sign in the
telegram.
Data types
3
4
5
6
7
9
10
13
33
35
Table 11.7 Data Types Supported
82
PKE IND PWE
high
Read text Fx xx 04 00
Write text Fx xx 05 00
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 16
Unsigned 32
Text string
Byte string
Time difference
Reserved
Bit sequence
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VLT® AutomationDrive FC 361
11.5.12 Conversion
The various attributes of each parameter are shown in the
section factory settings. Parameter values are transferred as
whole numbers only. Conversion factors are therefore used
to transfer decimals.
Parameter 4-12 Motor Speed Low Limit [Hz] has a conversion
factor of 0.1.
To preset the minimum frequency to 10 Hz, transfer the
value 100. A conversion factor of 0.1 means that the value
transferred is multiplied by 0.1. The value 100 is thus
perceived as 10.0.
Examples:
0 s⇒conversion index 0
0.00 s⇒conversion index -2
0 M/S⇒conversion index -3
0.00 M/S⇒conversion index -5
Conversion index
100
75
PWE
low
74
67
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
Table 11.8 Conversion Table
11.5.13 Process Words (PCD)
The block of process words is divided into 2 blocks of 16
bits, which always occur in the defined sequence.
Control telegram (master⇒slave control word)
Control telegram (slave⇒master) status word
Table 11.9 PCD Sequence
Conversion factor
1000000
100000
10000
1000
100
10
1
0.1
0.01
0.001
0.0001
0.00001
0.000001
0.0000001
PCD 1
Reference-value
Present output
frequency
PCD 2
MG06K102