Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Manual de usuario descargar pdf (Pagina 51)

51Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

Configurable Flowmeter Module Features and Operational Modes 51

Trickle Function for Totalizer Mode

The trickle function is used with the filler function to improve volume

repeatability in a filling application. The trickle function requires two filling

lines and an optional discrete module to activate the trickle valve. Activation of

the valve should be sized for worst case volume at least 100 ms based on

typical program scan = 5 ms and an output module RPI = 25 ms.

For most of the filling process, the full flow state is assigned to one of the

module’s outputs. For more repeatable fills or to prevent overfills, the

pretrigger feature helps make sure that the full flow valve turns off before it

reaches the Fill Transition

or Fill Total Target volume.

When the filling application reaches the user-defined Fill Transition

point, the

trickle totalizer mode changes the application from the full flow line to the

trickle flow line. This slower line allows the application to finish the filling

process without any waste.

For more information on the Fill Transition

feature, see page 57.

The filler function can be used in any of the following conditions:

 Starting with the trickle flow

 Filling with the full flow only

 Restarting the timed trickle flow

 Starting the trickle flow prior to the fill transition

 Restarting full flow while in trickle flow

Using the Trickle feature in previously mentioned conditions requires specific

configuration changes.

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Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Manual de usuario Pagina 51