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S5-115U Manual
Table 11-10. Description of the Control Bits in Control Word STEU
Control
Name
Bit
0
AUTO
1
XZ EIN
2
REG AUS
3
GESCHW
4
HANDART
5
NO Z
6 to 15
-
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
Signal
State
0
Manual mode
The following variables are updated in Manual mode:
1)
X
, XW
and PW
K
K-1
2)
XZ
, XZ
and PZ
K
K-1
3)
Z
and Z
, when STEU bit 5=0
K
K-1
Variable dD
is set to 0. The algorithm is not computed.
K-1
1
Automatic mode
0
XW
is forwarded to the differentiator. The XZ input is ignored.
k
1
A variable other than XW
0
Normal controller processing
1
When the controller is invoked (OB251), all variables (DW 18 to DW 48 )
with the exception of K, R, TI, TD, BGOG, BGUG, YH
the controller DB. The controller is deactivated.
0
Correction algorithm
1
Velocity algorithm
0
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.
1
When GESCHW=0:
The manipulated variable last output is retained.
When GESCHW=1:
Correction increment dY
0
With feedforward control
1
No feedforward control
The PID algorithm uses these bits as auxiliary flags.
Description
K-1
, when STEU bit 1=1
K-1
is forwarded to the differentiator.
k
and W
k
is set to zero.
K
Integral Blocks
are reset in
k
11-35
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