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For a read command, the index must have the following format:
04
00 H
The drive has two parameters for which a text can be written. These
are parameters 533 and 534, Display Text. See the description in the
parameter section of this manual. In order to write a text via the PWE
block, the parameter command (AK) must be set to 'F' Hex.
For a write command, the index must have the following format:
05 00 H
The following data types are supported by the drive:
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 packet.
Example - Index:
The first error code (index [1]) in parameter 615, Error code, must be
read.
PKE = 1267 Hex (read parameter 615, Error Code).
IND = 0001 Hex - Index no. 1.
1267 H 0001 H
The drive will respond in the parameter value (PWE) block by means
of an error code with a value from 1 through 99. See List of Warnings
and Alarms to identify the error code.
Parameter Value (PWE)
The parameter value block consists of 2 words (4 bytes). Its value
depends on the command given (AK). If the master inquires about a
parameter value, the PWE block contains no value.
If a parameter value is to be changed by the master (write), the new
value is entered in the PWE block and sent to the slave.
If the slave responds to a parameter requirement (read command), the
present parameter value is transferred in the PWE block and returned
to the master.
If a parameter does not contain a numerical value, but several data
selection options, for example parameter 001, Language, where [0] is
English and [4] is Spanish, the data value is selected by writing the
value in the PWE block. See the example on the following page.
Through serial communication, it is only possible to read parameters
with data type 9 (text string). In VLT 6000 drives, parameters 621
through 631, Nameplate Data are data type 9. For example, it is
possible in parameter 621, Unit Type, to read the unit size and input
voltage range.
When a text string is transferred (read), the packet length is variable,
since the texts have different lengths. The packet length is stated in the
2
nd
byte of the packet, called LGE.
In order to read a text via the PWE block, the parameter command
(AK) must be set to ‘F’ Hex.
The index character is used to indicate whether the command in
question is a read or write command.
PKE
IND
PWE
HIGH
PWE
LOW
PKE
IND
PWE
Lowbyte
Highbyte
IND
Lowbyte
Highbyte
IND
