Elmomc SimplIQ Software Manual Manual de usuario Pagina 213

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SimplIQ Software Manual 13BFilters
MAN-SIMSW (Ver. 1.4)
14-4
14.1 Internal Structure of a Filter Link
There are two types of filter links:
Type 16, a fixed link for which the next four link parameters are the filter coefficients.
Type 26, a scheduled link, for which the next four link parameters are not used. The four
filter coefficients are selected at run-time from the filter bank.
A filter link has five parameters:
Element Description Comment
0 Type 16 for fixed links
24 for scheduled links
1…4 Filter coefficients k
1
, k
2
, k
3
and k
4
Used only for fixed blocks
The parameters k
1
, k
2
, k
3
and k
4
are stored inside the SimplIQ drive as integers. As a
result, when you read back these coefficients, they may have slightly different values
than those that you programmed.
14.1.1 Fixed Link (Type 16)
The basic continuous-time second-order element is a filter with a unity DC gain:
DCsEs
BAsEs
B
D
2
2
++
++
Note that this element is very general: It can be used, for example, as a notch filter, a low-
pass complex pole filter, a double-lead element or a single pole.
The equivalent discrete form is:
21
2
21
2
0
azaz
bzbzb
++
++
Order Parameter Description Comment
1
k
1
b
0
+ b
1
+ b
2
Float, represented by a long value
2
k
2
-(b
1
+ b
2
) Float, represented by a long value
3
k
3
-b
2
Float, represented by a long value
4
k
4
a
2
Float, represented by a long value
Table 14-6: Fixed Link Parameters
The parameter a
1
is obtained explicitly by a
1
= b
1
+ b
1
+ b
1
-
a
1
- 1.
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