The process controller [2] receives the process setpoint E7 and the actual process
value E4 (e.g. from a sensor). On the basis of both values, the process controller
calculates the position setpoint E1 for positioner [3]. In turn, the positioner [3]
compares this target setpoint with the actual position value E2 of the valve and issues
the operation commands (OPEN - CLOSE) for the actuator.
Figure 41: Process controller function
[1]
Actuator controls
[2]
Process controller
[3]
Positioner
[4]
Actuator
[5]
Position transmitter e.g. EWG/RWG/MWG
[6]
Sensor
[7]
Valve
E1
Position setpoint (internal)
E2
Actual position value
E4
Actual process value
E7
Process setpoint
Application
The process controller can be used to control pressure, flow or flow rates, flow levels
and temperature.
8.7.1.
Process controller activation
Required user level:
Specialist (4)
or higher.
Device configuration M0053
Application functions M0178
Activation M0212
Process controller M0741
Default value:
Function not active
Setting values:
Function not active
<Process controller> function deactivated.
68
Actuator controls
Application functions
ACV 01.2/ACVExC 01.2 Profibus DP