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SC100/200 Series Function Block Application Manual EM-6460-C
4.3 CONTROL LOOP CONFIGURATION EXAMPLES
4.3.1 CASCADE CONTROL
The main purpose for configuring a cascade control system is to eliminate, through use of a secondary controller, the influ-
ence of disturbance on the primary loop, which enters through the secondary control loop.
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LOOP CONFIGURATION EXAMPLE
The MV output from the primary temperature loop is provided as setpoint to the secondary flow loop.
steam
flow
temp
PV
FIC
SEC
TIC
PRI
MV
SP
PV
MV