Endress+Hauser Proline Prosonic Flow 93 - Page 196

6 PID function block (PID controller) PROline Prosonic Flow 93 FOUNDATION Fieldbus
196 Endress+Hauser
6.9 Example of configuration
The measuring range of the flowmeter (controlled variable) is 0...30 m
3
/h.
The desired flow value (setpoint value) is specified manually by means of the SP
parameter and should be 15 m
3
/h. The Analog Output function block is actuated over
an output range of 0 ... 100%.
Configuration:
• Setting the input range and input unit of the controlled variable at input IN
:
• Setting the output range and output unit of the manipulated variable at output OUT:
• Defining the input limits for the setpoint value range:
• Defining the output limits for the manipulated variable at output OUT:
• Setting the bypass function:
In order to be able to deactivate the bypass function via the BYPASS parameter, the
Bypass Enable option must first be activated via the CONTROL_OPTS parameter.
• Setting the control parameter (depending on the controlled system):
GAIN - proportional gain factor (P-term)
RESET- time constant for the integral function (I-term)
RATE- time constant for the derivative action (D-term)
• Specifying the setpoint value via SP parameter:
SP = 15
• Configuration of the limit value and control deviation alarms and associated priorities,
if required.
• In order for the PID function block to be executed the operating mode must be set to
AUTO.
PV_SCALE 0 % = 0
PV_SCALE 100% = 30
PV_SCALE UNIT = m
3
/h
OUT_SCALE 0 % = 0
OUT_SCALE 100 % = 100
OUT_SCALE UNIT = %
SP_LO_LIM = 0
SP_HI_LIM = 30
OUT_LO_LIM = 0
OUT_HI_LIM = 100