Instruction Manual

I-10.7 Cascade controller
With cascade control, two coupled controllers act on a common actuator. A process value for the master and a pro
-
cess value for the slave controller are required.
The slave is determined via the external by the master. Cascade operation is possible in the following statuses:
Automatic mode
In a cascade, master and slave operate automatically during automatic mode. The master and process value are the
relevant variables for process control. The master is adjustable. The process value of the slave
¨ is displayed addi
-
tionally.
+
"Cascade" is displayed.
Ü
Operating page title
* Parameter set selection, if available
Ö
Switchover field cascade mode (open/clo-
sed)
ä
source of master (W
int
,W
ext
,W
2
)
#
Display field for manual mode (otherwise
empty)
<
Physical unit (master block parameter)
>
Entry into self-tuning
y
Master process value
x
Slave process value
c
(from master in automatic mode, from sla
-
ve with open cascade)
v
Bargraph and display
(Y from slave or X/XW from master)
—
Display of slave selection with open casca
-
de (otherwise empty)
Operating pages 9499-040-82711
I-46 Cascade controller
ambient temperature pre travel temperature
Ü
*
Ö
ä
#
<
y
>
c
v
x
b
Fig. 32 Operating page of a cascade controller in automatic