Siemens SITRANS LG270 Operating Instructions Manual page 72

Fig. 44: Schematic presentation function block Signal Characterizer
Function block Integrator
The function block "Integrator" integrates a continuous input signal over the time and sums the
results of an impulse input block. It is used as a totalizer up to a reset or as a subtotalizer up to a
reference point at which the integrated and accumulated value is compared with the default values.
When these default values are reached, digital output signals will be outputted. The integration func-
tion is carried out upwardly starting with zero and downwards with a default value. Two flow values
are also available so that the net flow volume can be calculated and integrated. This can be used for
calculation of volume and mass changes in the vessel or for optimisation of flow controls.
Fig. 45: Schematic presentation function block Integrator
Function block Input Selector
The function block "Input Selector" offers selection possibilities for up to four inputs and generates
an output signal according to the selection criteria. Typical input signals are AI blocks. Selection
possibilities are maximum, minimum, mean value, average value and first useful signal. Through
parameter combination, the block can be used as rotary switch or as preselection switch for the
first useful value. Switch information can be received by other input blocks or the user. Mean value
selection is also supported.
72 SITRANS LG270 - Operating Instructions PBD-51041071