3
Functional description of the structure switches
3.5 Control algorithm
Manual
SIPART DR21
C73000-B7476-C143-08
91
3.5
Control algorithm
D
Control algorithm
The PID-control algorithm is implemented as an interaction-free parallel structure and follows
the ideal controller equations whilst neglecting the filter constants and the cycle time.
- P-controller
ya =
Kp
⋅
xd + yo
or
ya
xd
=
Kp
- PI-controller
ya =
Kp (xd +
xd dt) +yo(t)
or
=
Kp (1 +
)
1
Tn
t
0
ya
xd
1
j
⋅
Tn
- D-element connection (zD-part)
The D-element connection can be added optionally.
ya
E
Tv
vv
=
Kp
j
⋅
Tv
1 + j
⋅
The input variable E for the D element is xd, x, x1,-z, or +z depending on the setting of
S47.
- z-connection
The z-part can be added optionally to the controller output ya.
ya =
c6
⋅
z
or
ya
z
=
c6
D
Controller direction of effect
The controller direction of effect is set with S46. It must always have the opposite behavior
(negative follow-up) to the controlled system (including final control element and transmitter).
S46= 0, normally acting controller (+Kp, rising x causes falling y) for normally acting systems
(rising y causes rising x)
S46=1, reversing controller (-Kp, rising x causes rising y) for reversing systems (rising y
causes falling x).
Содержание SIPART DR21
Страница 1: ...SIPART DR21 C73000 B7476 C143 08 1 SIPART DR21 6DR 210 Edition 08 2010 Manual ...
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Страница 16: ...1 General Part Fundamental control technology terms Manual 16 SIPART DR21 C73000 B7476 C143 08 ...
Страница 148: ...4 Installation 4 2 Electrical Connection Manual 148 SIPART DR21 C73000 B7476 C143 08 ...
Страница 180: ...5 Operation 5 5 CPU self diagnostics Manual 180 SIPART DR21 C73000 B7476 C143 08 ...
Страница 192: ...6 Commissioning 6 7 Manual setting of the control parameters Manual 192 SIPART DR21 C73000 B7476 C143 08 ...
Страница 234: ...9 General explanation of abbreviations for SIPART DR Manual 234 SIPART DR21 C73000 B7476 C143 08 ...
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