Rockwell Automation 1756-CFM ControlLogix Configurable Flowmeter Module - Manual (Page 98)

98 Rockwell Automation Publication 1756-UM010B-EN-P - December 2011
98 Configuring the Configurable Flowmeter Module
Follow the steps below to configure your CFM module for high resolution
frequency mode.
1. Create a new module, see page 80 .
2. Set all communications options, including:
 name
 communication format
 slot number
 minor revision
 electronic keying
 RPI - For this application, the minimum RPI = 5 ms
See pages 81 to 84 .
3. Access the module tags via the Tag Editor, see page 85 .
4. Change only the tags listed in Table 7 . You can ignore all other tags;
they do not affect high resolution frequency mode
Table 7 - Tag Changes Required for High Resolution Frequency Mode
Name Style Data type Definition Enter this
Value
C.Ch0LowFreqClear Decimal BOOL Enables the minimum detectable frequency level for
Channel 0.
Set the bit to 1 to enable it
1
C.Operations[0].OperationalMode Decimal SINT Sets the module’s operational mode.
0 = OFF
1 = Totalizer Mode
2 = Non-Resettable Totalizer Mode
3 = High Resolution Frequency Mode
3
C.Operations[1].OperationalMode Decimal SINT Sets the module’s operational mode.
0 = OFF
1 = Totalizer Mode
2 = Non-Resettable Totalizer Mode
3 = High Resolution Frequency Mode
0
C.Operations[0].AccelCalculation Decimal SINT Number of past samples to use to calculate an
acceleration value.
Sample range is 0 to 255.
50
C.Operations[0].MeterFactor Float REAL Calibration Adjust for metering reading applied after
K-factor correction. Typically, this factor is between
0.8 and 1.2 but the module restricts the value>0.
0
C.Operations[0].FilterResolution Float REAL Sets resolution of the Speed calculation based on the
raw counts
0 = default of 0.00001
0.00001 = resolution of + 1 count of 100,000 raw
counts.
0.00001