Rockwell Automation 1756-CFM ControlLogix Configurable Flowmeter Module - Manual (Page 57)

57 Rockwell Automation Publication 1756-UM010B-EN-P - December 2011
Configurable Flowmeter Module Features and Operational Modes 57
Net Rate
Use Net Rate to convert Net Volume to a rate using the
following equation:
Fill Total Target
Fill Total Target is the user-defined final volume (in engineering units) for a
total fill.
Fill Transition
Fill Transition is the user-defined Net Volume value to switch from full flow
to trickle flow.
Fill Transition Timer
After the transition from full flow to trickle flow, the Fill Transition Timer
value determines how long the trickle will last (i.e. this feature sets the time
that the trickle valve is open or ON).
Alarms with the Filler Function
The CFM module offers the following alarms when operating the
Filler function:
 Overflow Alarm - TotalCounts > RollOver Value
 Overrange Alarm - FreqPeriod > 100kHz
 Overspeed Alarm - Speed > Highest Allowed Frequency
 Acceleration Alarm - Acceleration > Acceleration Alarm Value
You must enable each alarm. When any of the alarms occur, it is latched and
remains on until you reset the alarm. (Toggle the alarm enable bit to reset the
alarm.)
Sample Configuration for Totalizer Mode Filler Function
To see a sample configuration for a 1756-CFM module using totalizer mode
filler function, including the use of all the features mentioned in the previous
section, see
page 108 .
Net Volume =
Total Counts in Meter Sample
K-factor x Sample Interval
x Meter Factor x CCF