Rockwell Automation 1756-CFM ControlLogix Configurable Flowmeter Module - Manual (Page 40)

40 Rockwell Automation Publication 1756-UM010B-EN-P - December 2011
40 Configurable Flowmeter Module Features and Operational Modes
Highest Allowed Frequency
Use Highest Allowed Frequency to set the trigger point for
Frequency. In other words, set this value so that when the input reaches it, the
outputs are energized. This value is also used for
the Overspeed Alarm.
Acceleration Alarm Value
Use Acceleration Alarm to set the trigger point for Acceleration.
In other words, set this value so that when the input reaches it,
the outputs are energized. This value is also used for the
Acceleration Alarm.
Frequency Average
With Frequency Average, the CFM divides meter counts by a user-defined
sample interval (up to 2 seconds) to determine the Frequency Average.
Acceleration
Use Acceleration to determine an acceleration value over a user-defined
number of samples.
Alarms in High Resolution Frequency Mode
High Resolution Frequency mode offers the following alarms:
 Overrange Alarm
 Overspeed Alarm
 Acceleration Alarm
You must enable each alarm. When any of the alarms occur, it is latched and
remains on until the user resets the alarm.
Sample Configuration for High Resolution Frequency Mode
To see a sample configuration for a 1756-CFM module using high resolution
frequency mode, including the use of all the features mentioned in the
previous section, see
page 97 .