Endress+Hauser Proline Prowirl 72 - 2 Selecting the Operating Mode; 3 Selecting the Process Variable; 4 Linearization Types; 5 Selecting the Units

11 Operation via FOUNDATION Fieldbus Proline Prowirl 72 FOUNDATION Fieldbus
116 Endress + Hauser
11.10.2 Selecting the operating mode
The operating mode is set by means of the MODE_BLK parameter group (see Page 87).
The Analog Input Function Block supports the following operating modes:
•AUTO
•MAN
• OOS
!
Note!
The OOS block status mode is also displayed by means of the BLOCK_ERR parameter
(Page 88). In the OOS operating mode, all write parameters can be accessed without
restriction if write protection has not been enabled.
11.10.3 Selecting the process variable
Prowirl 72 FF has two Analog Input Function Blocks. The input value (process variable) to be
processed is assigned via the CHANNEL parameter:
• CHANNEL = 1  Calculated mass flow
• CHANNEL = 2 Volume flow
• CHANNEL = 3  Corrected volume flow
• CHANNEL = 7  Totalizer
11.10.4 Linearization types
In the Analog Input Function Block, the input value from the Transducer Block can be linearized
via the L_TYPE parameter (Page 40 ff.). The following linearization types are available:
•Direct
In this setting, the input value bypasses the linearization function and is looped unchanged with
the XD_SCALE unit through the Analog Input Function Block.
•Indirect
In this setting, the input value is rescaled linearly via the XD_SCALE input scaling to the desired
output range OUT_SCALE.
• Indirect Square 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.
11.10.5 Selecting the units
The XD_SCALE parameter group is used to determine with which physical unit the input value
from the Transducer Blocks should be read in and processed in the Analog Input Function Block.
Make sure that the unit selected suits the input value chosen in the CHANNEL parameter. The
output value OUT is specified via the OUT_SCALE parameter group.
!
Note!
• Example for rescaling the input value (Page 118)
• The system units selected in the Transducer Blocks in question do not have any effect on the
setting of the system units in the Analog Input Function Block. The units are specified
independently of one another and must be configured separately. The unit selected in the
Transducer Blocks is only used for the local display, low flow cut off and for simulation.