Dosing - Siemens MASS 2100 Operating Instructions Manual

- Memory: the totalizer continues counting based on the last input value (for example massflow)
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.
8.8

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.
The flow sequence can be paused, resumed and ended by the user at any point in the flow
sequence.
Transmitter outputs therefore change state according to the dosing sequence or operator
commands. For optimal dosing control the minimum number of components between the
flowmeter and the dosing valves must be employed. The dosing function must be configured
for the type of valve used for dosing:
● One on/off valve:
Dosing controlled by a single discrete (Open/Closed) valve. The valve opens completely
when the dosing begins, and closes completely when the dosing Amount is reached.
● Two on/off valves:
Dosing controlled by two discrete valves (a primary valve and a secondary valve). One
valve opens at the beginning of the dosing; the other opens at a user-defined amount. One
valve stays open until the end of the dosing; the other closes at a user-defined amount.
See examples below (Page 157) of some different opening and closing options.
● Control valve:
Dosing controlled by an analog valve configured in three stages as fully open, partially
closed, and fully closed. See example below (Page 157) of the three-positional Control
valve.
Dosing setup procedure
The dosing functionality is configured via HMI. Menu 2.4 "Inputs/Outputs" determines how the
transmitter will use the inputs and outputs for dosing control. Menu 2.5 "Dosing" independently
determines the sequencing of the outputs to achieve the user's desired result.
The dosing function provides:
● three dosing valve control mechanisms (One on/off valve, Two on/off valves or Control
valve)
● dosing of mass flow, volume flow, standard volume flow or fraction flow (mass or volume)
● five independently configurable recipes
● flexible discrete or analog valve control
● fault handling – time and amount monitoring
MASS 2100 & FC300 (FCT030)
Operating Instructions, 06/2017, A5E39789040-AA
Functions
8.8 Dosing
155