Endress+Hauser Proline Prowirl 72 - Page 115

Proline Prowirl 72 FOUNDATION Fieldbus 11 Operation via FOUNDATION Fieldbus
Endress + Hauser 115
The Analog Input Function Block receives its input value from the Transducer Block "Flow" or
"Totalizer"(Page 84 ff.). The CHANNEL parameter is used to select which input value should
be processed by the Analog Input Function Block.
• CHANNEL = 1  Calculated mass flow
• CHANNEL = 2 Volume flow
• CHANNEL = 3  Corrected volume flow
• CHANNEL = 7  Totalizer
The SIMULATE parameter group allows you to replace the input value with a simulation value and
activate simulation. By specifying the status and the simulation value, the reaction of the complete
Analog Input Function Block can be tested.
!
Note!
The simulation mode is enabled by means of a DIP switch (Page 117)
The L_TYPE parameter is used to select the type of linearization of the input and/or simulation
value (Page 40 ff.):
• Direct signal conversion
The input value is forwarded without any conversion (XD_SCALE = OUT_SCALE). This is
selected if the input value is already in the physical units you want.
• Indirect signal conversion
In this setting, the input value is rescaled linearly via the input scaling XD_SCALE to the desired
output range OUT_SCALE (further information on rescaling the input value can be found on
Page 118).
• Indirect signal conversion with root
In this setting, the input value is rescaled via the XD_SCALE parameter group and calculated
again using a root function. Further rescaling follows to the desired output range via the
OUT_SCALE parameter group.
The LOW_CUT parameter can be used to specify a limit value for low flow cut off. Low flow cut off
is activated via the IO_OPTS parameter. If the converted input value (PV) is below the limit value,
it is set to "Zero".
In the PV_FTIME parameter, a filter time can be specified for filtering the converted input value
(PV). If a time of 0 seconds is specified, the input value is not filtered.
The MODE_BLK parameter group (Page 87) is used to select the operating mode of the Analog
Input Function Block. If the MAN (manual) operating mode is selected, the output value OUT can
be specified directly.
The OUT output value is compared against early warning and alarm limits (e.g. HI_LIM,
LO_LO_LIM, etc.) that can be entered via various parameters. If one of these limit values is violated,
a limit value process alarm (e.g. HI_ALM, LO_LO_ALM, etc.) is triggered.
The most important functions and parameters of the Analog Input Function Block are listed below.