Siemens SITRANS FC330, Руководство по эксплуатации, Страница: 145 / 280

● Reset totalizer
– Resets one of the internal totalizers 1, 2 or 3 (depending on configuration)
● Resets all totalizers simultaneously
● Freeze signal
– Freezes all currently measured values in the display and outputs
● Force signal
– Forces all outputs to adopt the value selected in the menu. If the value 100% is selected,
the current output will show 20 mA and the frequency output will show 10.000 kHz when
the external output is activated
WARNING
Changing polarity
Changing the polarity triggers the signal input to execute the set functionality.
8.2.7 Totalizers
Totalizer functions
The device has three independent totalizers that can be used to total the mass flow, volume
flow, corrected volume flow, fraction A (volume flow or mass flow) or fraction B (volume flow or
mass flow).
The totalizers can be configured to count balance (net flow), positive flow or negative flow.
In case of failure in the system, the totalizer fail safe mode can be set to:
- Hold (default): the totalizer holds the last value before the failure occurred
- Run: the totalizer continues counting the actual measured value
- Memory: the totalizer continues counting based on the last input value (for example mass
flow) before the failure occurred.
The totalizers can be operated via the Local User Interface or bus communication (for example
SIMATIC PDM). The totalizers can be reset or preset.
8.2.8 Dosing
The dosing function controls the sequence of flow through one or two valves into a container.
The user can set the Amount and the sequence of controlling the valve(s). The dosing function
then controls the valves to open and close in sequence to achieve the Amount.
The process values for dosing control are updated with 100 Hz to ensure maximum response
time of 10 ms to rapidly changing flows.
Parameter assignment
8.2 Functions
SITRANS FC330
Operating Instructions, 01/2019, A5E44030648-AB
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