3.7 Control loops
The following is an example of a simple control loop which uses the level analog input
block, flow analog input block, two PID blocks (e.g. from flowmeter and valve) and a
valve analog output block. The connections between the function blocks can be
made in the configuration tool.
LEVEL1
LI01
CONVAL1
LC01
FC01
FLOW1
FI01
VALVE1
FX01
BA211Y31
Figure 3.6
Schematic diagram of control
loop
LI01
FI01
FX01
OUT
OUT
AI
AI
HMI
AO
LEVEL1
FLOW1
VALVE1
LC01
AUTO
AUTO
AUTO
CAS
CAS
FC01
OUT
OUT
IN
IN
SP
CAS_IN
CAS_IN
BKCAL_IN
BKCAL_IN
BKCAL_OUT
BKCAL_OUT
BKCAL_OUT
PID
PID
CONVAL1
BA211Y32
Figure 3.7
Function block connections
Cerabar S FF 3 Foundation Fieldbus Interface
Endress+Hauser 27
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