-20-
CONTROL SCHEMES
(see page 12)
Command
Signal
(Input #1)
(Position)
Controller
Actuator
Drive
Valve
Open Loop
GPSA Controller
(Positioner Mode)
Actuator
Output
Actuator Internal Position Feedback
Process
Variable
Feedback
(Input #2)
Controller
Actuator
Drive
Valve
Closed Loop
GPSA Controller
(Process Control
Mode)
Actuator
Output
Local or
Remote
PV Setpoint
(Input #3)
PV
Sensor
Process
Variable
Process
Variable
Feedback
(Input #2)
Controller
Actuator
Drive
Valve
Feed Forward
GPSA Controller
(Process Control
Mode)
Actuator
Output
Local or
Remote
PV Setpoint
(Input #3)
PV
Sensor
Process
Variable
Command
Signal
(Input #1)