Design Guide | VLT® AutomationDrive FC 360
When a follower responds to a parameter request (read command), the present parameter value in the PWE block is transferred and
returned to the master. If a parameter contains several data options, for example, parameter 0-01 Language, select the data value by
entering the value in the 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 the 2nd 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.
9.4.11 Data Types Supported by the Drive
Unsigned means that there is no operational sign in the telegram.
Table 36: Data Types
Data types Description
3 Integer 16
4 Integer 32
5 Unsigned 8
6 Unsigned 16
7 Unsigned 32
9 Text string
9.4.12 Conversion
The programming guide contains the descriptions of attributes of each parameter. Parameter values are transferred as whole numbers
only. Conversion factors are 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.
Table 37: Conversion
Conversion index Conversion factor
74 3600
2 100
1 10
0 1
-1 0.1
-2 0.01
-3 0.001
-4 0.0001
-5 0.00001
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