PROline Prosonic Flow 93 FOUNDATION Fieldbus 4 Analog Input function block
Endress+Hauser 163
4.4 Linearisation types
In the Analog Input function block, the input value from the Transducer Block can be
linearised via the L_TYPE parameter, (see Page 174). The following types of
linearisation are available:
• Direct
With this setting, the input value avoids the linearisation function and is looped
unchanged with the same unit through the Analog Input function block.
• Indirect
With this setting the input value is re-scaled linearly via the XD_SCALE input scaling
to the desired OUT_SCALE output range, (further information on rescaling of the input
value can be found on Page 165).
• Indirect Square Root
With this setting, the input value is re-scaled via the XD_SCALE parameter group and
recalculated using a root function. It is then rescaled again to the desired output range
via the OUT_SCALE parameter group.
4.5 Selecting the units
The XD_SCALE parameter group, (see Page 180), is used to define with which physical
unit the input value of the Transducer Block should be read in and processed in the
Analog Input function block. Ensure that the unit selected suits the input value selected
in the CHANNEL parameter. The unit of the output value OUT is specified via the
OUT_SCALE parameter group, (see Page 178). If the "Direct" linearisation mode was
selected via the L_TYPE parameter, (see Page 174), the setting of the XD_SCALE and
OUT_SCALE parameter groups must be identical as otherwise the function block
remains in the OOS operating mode and the “BLOCK CONFIG ERROR” block error is
displayed in the BLOCK_ERROR parameter.
Note!
• Example of rescaling the input value
→ Page 165
• The selection of the system units in the relevant Transducer Blocks does not affect the
system unit setting in the Analog Input function block. These settings must be made
separately. The unit selected in the Transducer Blocks is only used for the local
display, low flow cut off and for simulation.
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