Manual
1 Technical Description
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
58
SIPART DR22 6DR2210
C79000-G7476-C154-03
1.5.4.5 S1 = 3:
Follow-up controller, synchronized controller, SPC-control-
ler
y
a
+c6 · z
we
+
P I D
z
FE4
x1
FE1
x2
FE2
tS
y
H
FE3
SES
w
ES
wi
wi
INT
∧
CB
w
E
w
EA
x
x=x1+c1 · x2+c3
x
w
y
Δ
w
y
a
w
x
0000
0000
000
--
w
SL
w
E
=c4 · w
E
+c5
Figure 1-30
Principle representation S1 = 3
In this controller type you can switch between the internal setpoint wi and the external setpoint
w
E
depending on the control signals CB and the Internal-/External key (2) (see table 1--11,
page 61 and table 1--12, page 62).
The external setpoint can be preset via the analog output FE3 (w
EA
) or via the digital signals
Δ
w as an incremental setpoint (w
E
Δ
) (selection via S53) or via the SES (w
ES
) (selection by
S101). The active setpoint w can be fed back by an appropriately assigned analog output to the
feeding controller for follow up when using w
EA
or for displaying when using w
E
Δ
.
This controller type is used for cascade controls with 2 separate controllers (master and fol-
low-up controllers), for synchronized controls, fixed setpoint controls with external setpoint pre-
set (e.g. under console conditions via the incremental
Δ
w-inputs) and SPC-controls (setpoint
control). This controller type attains special importance when coupled with the SIPART software
for operation and monitoring. Here this controller type is used for fixed setpoint control with
external setpoint preset (w
ES
) and Automatic/Manual switching via the follow-up signal N
ES
and
the input y
ES
(see chapter 1.5.6, page 99).
-- SPC controls
Here a process computer takes over the setpoint command during computer operation
RC = Int
∧
CB = 1, in the event of a computer failure (CB from 1
!
0) the controller takes
over either the last computer setpoint (followed up wi) or the safety setpoint SH (selection
via S51).
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