Scaling The Display Value - Siemens SITRANS P DS III Operating Instructions Manual

Description of measuring mode "Level"
MA
ME
Figure 7-10
Note
If, when setting the analog output, the values for the start of scale value zero and the full
scale value are more than 20% below or above the limit values of the set PV (set using the
variable mapper), the values will be rejected by the device. The values configured previously
are retained. Similarly, the span must not fall below the minimum.
Minimum span = ME - MA
The square root extracting function can only be selected in the "Pressure" measuring mode.
The root extraction function "srli2" is set in "flow rate" measuring mode. You therefore set the
"characteristic curve" parameter in SIMATIC PDM to "linear".
7.3.11

Scaling the display value

Introduction
You can scale the value shown in the display as you wish and allocate it any unit of 5
characters. The scaling of the value is independent of the selection of the measuring mode
selector, the primary variable (PV) and the display unit defined. Use the "Display settings"
item in SIMATIC PDM or the HART communicator for this purpose.
The percent value of the PV is the basis for this scaling. This percent value is also used to
scale the current output. In SIMATIC PDM, this item is referred to as "Setting the PV output
scaling". After selecting the "Display settings" menu item, you must enter a start-of-scale
value, a full-scale value and a unit string.
This display option has the highest priority amongst all options. A switch over to %, mA or
any other unit is not possible in this status. You need to deactivate the LCD scaling again for
this purpose.
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09
Start of scale value
Full scale value
"Analog output" block
Operating functions through HART
7.3 Selecting the measuring modes
p Pressure
PV Primary variable
121