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Rosemount Model 8800C Vortex Flowmeter with FOUNDATION
™
Fieldbus
3-4
Cascade Control Cascade control applications require two inputs. The configuration is to
link the output of one AI block into the PID block in the Model 8800C
transmitter and to link the AI block of a second Model 8800C
transmitter into the PID block of that transmitter. Another set of links
between the second PID and the AO block, located in the control valve,
is required (see Figure 3-4).
Figure 3-4. Cascade Control
Configuration.
AI
Block 1 (AI1)
Transducer
Block
AI
Block 2 (AI2)
from second
Model 8800C
Transmitter
OUT
OUT
Flow
IN
IN
OUT
BKCAL_IN
OUT
PID Block 1
(PID1)
BKCAL_OUT
AO Block
CAS_IN
BKCAL_IN
PID Block 2
(PID2) from
second Model
8800C
Transmitter
BKCAL_OUT
CAS_IN
AI1
Macro Cycle
PID
AO
IN
IN
AI2
PID2