Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Manual de usuario descargar pdf (Pagina 57)

57Rockwell 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 To tal Ta rget

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

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 167 168

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Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Manual de usuario Pagina 57