Manual
1 Technical Description
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
SIPART DR22 6DR2210
C79000-G7476-C154-03
75
In this controller type a master controller (Controller
II
) and a follow-up controller as a com-
manded ratio controller (Controller
I
) are interconnected in a ratio cascade.
(Applications see S1 = 4)
-- Master controller
The master controller has the same structure with respect to the setpoint switching as the
follow-up controller S1 = 3. It is therefore a fixed setpoint controller with the possibility of ex-
ternal setpoint preset via the analog signal, the serial interface or as an incremental setpoint
via the control signals
Δ
w. Selection is made with w
SL
II
and S101. In computer coupling it
is also possible here, in the case of a computer failure (CB from 1
!
0) to continue working
with the last computer setpoint (followed-up wi) or with the safety setpoint SH (selection by
S51). The master controller cannot be switched to manual operation but the follow-up con-
troller can be switched to the internal setpoint. x-tracking in A-operation is possible by selec-
tion with S50 = 1. The follow-up of the inactive setpoint to the active setpoint can be
switched off by S52 = 1.
-- Follow-up controller
The follow-up controller is a ratio controller as described under S1 = 4. To disconnect the
cascade the Internal/External key (2) (Int
I
) can be used to switch between the internal ratio
factor wvi and the external ratio factor wv
E
, which is equal to the manipulated variable of the
master controller (ya
II
). The internal operation of the follow-up controller corresponds to
manual operation of the master controller.
xv-tracking is possible in A-operation by selection with S50 = 1. Setpoint limitings can be
performed via limiting of the manipulated variable of the master controller and possibly by
limiting the commanding process variable x2
I
in the freely connectable input range (S4 = 1).
The follow-up of the master controller and xv-tracking in A-operation and the follow-up of the
internal ratio factor wvi in external operation and in x-tracking (A) always takes place so that
switching is bumpless.
Table 1-14, page 72 and the statements on x-tracking of the cascade controls apply accord-
ingly when wi is replaced by wvi and w
E
by wv
E
.
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