Siemens SIMATIC S5-115U, Руководство пользователя

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S5-115U Manual Integral Blocks
Table 11-10. Description of the Control Bits in Control Word STEU
Name Control
Bit Signal
State Description
0 0
1
Manual mode
The following variables are updated in Manual mode:
1)
X
K
, XW
K-1
and PW
K-1
2) XZ
K
, XZ
K-1
and PZ
K-1
, when STEU bit 1=1
3) Z
K
and Z
K-1
, when STEU bit 5=0
Variable dD
K-1
is set to 0. The algorithm is not computed.
Automatic mode
1 0
1
XW
k
is forwarded to the differentiator. The XZ input is ignored.
A variable other than XW
k
is forwarded to the differentiator.
3 0
1
Correction algorithm
Velocity algorithm
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
GESCHW
XZ EIN
AUTO
2 0
1
Normal controller processing
When the controller is invoked (OB251), all variables (DW 18 to DW 48 )
with the exception of K, R, TI, TD, BGOG, BGUG, YH
k
and W
k
are reset in
the controller DB. The controller is deactivated.
REG AUS
4 0
1
When GESCHW=0:
Following the transfer to Manual mode, the specified manipulated
variable value YA is adjusted exponentially to the manual value in four
sampling steps. Additional manual values are then forwarded immediately
to the controller output.
When GESCHW=1:
The manual values are forwarded immediatley to the controller output.
The limiting values are in force in Manual mode.
When GESCHW=0:
The manipulated variable last output is retained.
When GESCHW=1:
Correction increment dY
K
is set to zero.
HANDART
5 0
1
With feedforward control
No feedforward control
NO Z
6 to 15
The PID algorithm uses these bits as auxiliary flags.
-
The control program can be supplied with fixed values or parameters. Parameters are input via
the assigned data words. The controller is based on a PID algorithm. Its output signal can be either
a manipulated variable (correction algorithm) or a manipulated variable modification (correction
rate algorithm).
EWA 4NEB 811 6130-02b
11-35