NORD Drivesystems BU0590 - Manual (Page 29)

4 Communication
BU 0590 GB-0312 Subject to technical amendments 29
4.2.3.2 Parameter index field
The structure and function of the parameter index depends on the type of parameter to be transferred. For
values which depend on the parameter set, the parameter set can be selected via Bits 8 and 9 of the Index
(0 = parameter set 1, 1 = parameter set 2,...).
If the parameter to be processed is also an array parameter, then the sub-index of the required parameter
can additionally be accessed via Bit 10 to Bit 15 of the sub-index (0 = array element 1, 1 = array element
2,…):
Array element Parameter set Index
5 (000101
BIN
) 2 (01
BIN
) 15
HEX
= 0001 0101
BIN
21 (010101
BIN
) 4 (11
BIN
) 57
HEX
= 0101 0111
BIN
Table 25 Example: Address formation for array elements or parameters depending on parameter sets
If a parameter is not dependent on the parameter set, then Bit 8 -15 are used for the sub-index.
Please refer to the operating instructions for details of the structure of the individual parameters and which
values may be called up.
If the sub-index is used, nos. 6, 7, 8 or 11, 12 must be used as the order label (see Section 4.2.3.1), in order
for the sub-index to be effective.
4.2.3.3 Parameter value field
For each parameter, the transfer of the parameter value is always as a word (16 Bit) or double word (32 Bit)
For negative values, the High bytes must be filled up with FF hex.
The parameter value is transferred as an integer value. For parameters with resolutions 0.1 or 0.01 the
parameter value must be multiplied by the inverse of the resolution.
Example: A run-up time of 99.99 seconds is to be set.
99.99s  99.99 * 1 / 0.01 = 99.99 * 100 = 9999
Therefore the value 9999
dec
= 270F
hex
must be transferred.