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Chapter 3
Configurable Flowmeter Module Features and Operational Modes
Using the Totalizer Mode
Prover Function
Logix controller:
• performs AGA/API calculations
• controls prover
• calculates/compensates based on actual
temperature
36
In the Totalizer mode prover function, the 1756-CFM module interfaces to a
prover and counts pulses using a flowmeter or positive displacement meter.
The module then scales pulse count to engineering units. The module can also
use this mode to calculate frequency over a user-defined time period, where
frequency is calculated as counts per unit time.
Either module output can be tied to either flowmeter input with the prover
function, and output operation can occur independently from new data from
the Logix owner-controller.
With the prover function, the Totalizer is active all the time, but the prover
function must first be enabled and started to activate the Prover Total. Once
the prover function is started, only the gate signal or a user-override (that is,
clearing the Prover Enable bit) can eliminate the function. However, the Gross
Volume, Net Volume, and Fill Total will continue to accumulate as long as the
flow input frequency is enabled and is greater than Low Frequency Clear.
This figure shows a 1756-CFM module in a petrochemical flow and custody
transfer application while operating in the Totalizer mode prover function.
1756-CFM
monitor fuel flow and total gallons
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
1756-IF8I
Remote
Termination
Panel
TT
PT
FT
prover
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