Rockwell-automation 1756-CFM ControlLogix Configurable Flowmeter Modul Instrukcja Użytkownika Pobierz pdf (Strona 48)

48Rockwell Automation Publication 1756-UM010B-EN-P - December 2011

48 Configurable Flowmeter Module Features and Operational Modes

Gross Rate

Use Gross Rate to convert total counts to rate units. The module employs a

user-defined K-factor in the conversion. The K-factor is a divisor, and the time

interval is divided by this number, as shown below.

 If the input frequency is below 100Hz, the K-factor used is always 10.0

for frequencies interpolated between 0-100Hz.

 If the input frequency is between 100Hz and 200Hz, the K-factor is

interpolated as follows:

 If the input frequency is between 200Hz and 300Hz, the K-factor is

interpolated as follows:

 If the input frequency is greater than 300Hz, the K-factor used

is always 100.0. There is no K-factor calculation over 300Hz.

To use Gross Rate, you must set the K-factor values in Module Tags, as shown

below.

Gross Rate =

Total Counts in Meter Sample

K-factor

x Meter Factor

K-factor = (f

- 100.0) x

(71.0 - 25.0)

(200.0 - 100.0)

x 25.0

K-factor = (f

- 200.0) x

(111.0 - 71.0)

(300.0 - 200.0)

x 71.0

Name Style Data type Value Change during

operation

C.Operations[0].kFactStruct.kFactorForChan[0] Float REAL

25.0

(1)

Yes

C.Operations[0].kFactStruct.kFactorForChan[1] Float REAL

25.0

(1)

Yes

C.Operations[0].kFactStruct.kFactorForChan[2] Float REAL 71.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[3] Float REAL 111.0 Yes

C.Operations[0].kFactStruct.kFactorForChan[4]-

C.Operations[0].kFactStruct.kFactorForChan[12]

Float REAL 0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[0] Float REAL 0.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[1] Float REAL 100.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[2] Float REAL 200.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[3] Float REAL 300.0 Yes

C.Operations[0].kFactStruct.FreqAtKFactor[4]-

C.Operations[0].kFactStruct.FreqAtKFactor[12]

Float REAL 0 Yes

(1)

To avoid discontinuity when interpolating Gross Rate, make sure the values in C.Operations[0].kFactStruct.kFactorForChan[0] and C.Operations[0].kFactStruct.kFactorForChan[1] match.

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