Endress+Hauser Proline Promag 55 Operating Manual page 113

Device functions Proline Promag 55 FOUNDATION Fieldbus
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Endress+Hauser
The Analog Input function block receives its input value from the Transducer Block.
The parameter CHANNEL is used to select which input value is to be processed by the Analog Input
function block. The Promag 55 FOUNDATION Fieldbus is configured in the factory as follows:
• CHANNEL = 1 → Calculated mass flow
• CHANNEL = 2 → Volume flow
• CHANNEL = 7 → Totalizer 1
• CHANNEL = 8 → Totalizer 2
• CHANNEL = 9 → Totalizer 3
The parameter group SIMULATE allows you to replace the input value with a simulation value and
to 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 the corresponding jumpers on the I/O board (→ see
Operating Instructions for Proline Promag 55 FOUNDATION Fieldbus, BA126D).
The parameter L_TYPE is used to select the linearization type of the input or simulation value:
• Direct signal conversion
The value is forwarded without conversion (XD_SCALE = OUT_SCALE). Select this option if the
input value is already in the physical unit you want.
• Indirect signal conversion
With this setting the measured value from the Transducer Block (input value) is re-scaled linearly
via the input scaling XD_SCALE to the desired output range OUT_SCALE (further information
on rescaling of the input value can be found on → Page 116).
• Indirect signal conversion with square root
With this setting the measured value from the Transducer Block (input value) is re-scaled via the
parameter group XD_SCALE and recalculated using a square root function. It is then rescaled
again to the desired output range via the parameter group OUT_SCALE.
The parameter LOW_CUT allows a limit value to be specified for the low flow cut off. The low flow
cut off is activated via the parameter IO_OPTS. If the converted primary value (PV) is below the
limit value then it is set to a value of "Zero".
In the parameter PV_FTIME a filter time can be specified for filtering the converted primary value
(PV). If a time of 0 seconds is specified then no filtration takes place.
The parameter group MODE_BLK is used to select the operating mode of the Analog Input function
block. If the operating mode MAN (manual) is selected then the output value OUT can be specified
directly.
The output value OUT is compared with 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 then a limit value
process alarm (e.g. HI_ALM, LO_LO_ALM, etc.) is triggered.
5 Analog Input function block
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