Siemens SIMATIC S5 Manual page 218
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S5-115F Manual
Correction Rate Algorithm
A particular correcting increment dY
the following formula:
•
Without feedforward injection of disturbance variable (D11.5 = 1) and application of XW to
the differentiator (D11.1 = 0)
dY
= K [(XW
- XW
k
k
k-1
= K (dPW
R + dI
k
•
With feedforward injection of disturbance variable (D11.5 = 0) and application of XW to the
differentiator (D11.1 = 0)
dY
= K [(XW
- XW
k
k
k-1
= K (dPW
R + dI
k
•
Without feedforward injection of disturbance variable (D11.5 = 1) and application of XZ to
the differentiator (D11.1 = 1)
dY
= K [(XW
- XW
k
k
k-1
= K (dPW
R + dI
k
•
With feedforward injection of disturbance variable (D11.5 = 0) and application of XZ to the
differentiator (D11.1 = 1)
dY
= K [(XW
- XW
k
k
k-1
= K (dPW
R + dI
k
P component
I component
When XW
is applied:
k
When XZ is applied:
The result is:
Correction Algorithm
The same algorithm is used for the correction algorithm as for the correction rate algorithm.
The difference compared with the correction rate algorithm is that, at the sampling point t
sum of all control increments dY
correcting increment calculated at this instant.
At the instant t
, manipulated variable Y
k
m=k
Y
=
dY
k
m=0
EWA 4NEB 811 6149-02
is calculated at a particular instant t= k
k
) R+TI
XW
+ (TD (XW
•
k
+ dD
)
k
k
) R+TI
XW
+ (TD (XW
•
k
+ dD
)+dZ
k
k
k
) R+TI
XW
+ (TD (XZ
•
k
+ dD
)
k
k
) R+TI
XW
+ (TD (XZ
•
k
+ dD
)+dZ
k
k
k
D component
XW
k
PW
k
QW
k
PZ
k
QZ
k
dPW
k
dI
k
dD
k
dZ
k
calculated up to this point is output (in DW 48) instead of the
k
is calculated as follows:
k
m
- 2XW
+ XW
) + dD
k
k-1
k-2
- 2XW
+ XW
) + dD
k
k-1
k-2
- 2XZ
+ XZ
) + dD
k
k-1
k-2
k-1
- 2XZ
+ XZ
) + dD
k
k-1
k-2
k-1
Z component
=
W
- X
k
k
=
XW
- XW
k
=
PW
- PW
k
=
XW
-2XW
k
=
XZ
- XZ
k
k-1
=
PZ
- PZ
k
k-1
=
XZ
-2XZ
k
k-1
=
(XW
- XW
k
=
TI
XW
•
k
=
(TD
QW
•
k
=
(TD
QZ
+dD
•
k
=
Z
- Z
k
k-1
TA according to
•
)]
k-1
)]+(Z
-Z
)
k-1
k
k-1
)]
)]+(Z
-Z
)
k
k-1
th
k: k
sample
k-1
k-1
+XW
k-1
k-2
+XZ
k-2
)R
k-1
+dD
) with XW application
k-1
) with XZ application
k-1
Blocks
, the
k
6-17
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