Siemens SIPART DR22 Manual page 72

1 Technical Description
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
In this controller type a master controller (Controller II) and a follow-up controller
(Controller I) are interconnected in one controller in a cascade (application, see S1 = 3).
-- Master controller (controller II)
With respect to the setpoint switching the master controller has approximately the same
structure as the follow-up controller S1 = 3. It is therefore a fixed setpoint controller with the
possibility of external setpoint preset via analog signal, the serial interface or as an incre-
mental setpoint via the control signals Δw. Selection is made with w
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 set-
point SH (selection by S51). The master controller cannot be switched to manual operation
but the slave controller can be switched to the internal setpoint.
Follow-up of the inactive setpoint to the active setpoint can be switched off with S52 = 1.
-- Follow-up controller (controller I)
The follow-up controller can be switched for disconnecting the cascade for startup proce-
dures via the Internal/External key (2) (Int I) between the internal setpoint wiI and the exter-
nal setpoint w I which is equal to the manipulated variable of the master controller (yaII).
E
The internal operation of the follow-up controller corresponds to manual operation of the
master controller.
Setpoint limiting of the follow-up controller can be implemented by the y-limiting of the
master controller. The follow-up of the master controller in internal operation of the follow-up
controller and x-tracking (A) and the follow-up of the internal setpoint of the follow-up
controller in external operation and x-tracking (A) always takes place so that the switching
Internal/External is bumpless.
-- Display and operating level switching
With the Shift key (12) the digital and analog x- and w-displays and the function of the Inter-
nal/External key (2) including the Internal LED (1) and the Δw-adjustment keys (6) are
switched to the selected controller. The y-display (14), the Manual/Automatic key (9) and
the Δy-adjustment keys (13) are permanently assigned to the follow-up controller.
70
Manual
II and S101. In
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SIPART DR22 6DR2210
C79000-G7476-C154-03