CiDRA Use of Foundation Fieldbus Protocol with SONARtrac Transmitters User Manual

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Table 3 Transducer Block Configurations (Page 8)

FLOW_NORMALIZATION

Unsigned
Long

R/W

Enable/disable normalization of sensor data. 0 - No
normalization* 1 - Normalize data. Normalization
performed in frequency domain.

FLOW_DIFFERENCING

Unsigned
Long

R/W

Enable/disable differencing of sensors. 0 - No
differencing* 1 - difference sensors using first order
differencing. (i.e. Ch1=S1-S2* Ch2=S2-S3...Ch7=S7-
S8). 2 - second order differencing (i.e. Ch1=S1-
2*S2+S3* Ch2=S2-2*S3+S4...) Calculation performed in
frequency domain.

FLOW_DIRECTION

Unsigned
Long

R/W

Define flow direction.

FLOW_WINDOW_SIZE_MULTIPLIER

Unsigned
Long

R/W

Default values are normally OK. Define target number of
passes through array per calculation for volumetric flow.
Use with caution.

FLOW_PEAK_SEARCH_MODE

Unsigned
Long

R/W

0 - Velocity search limits set to FLOW_MIN and
FLOW_MAX* 1 - Velocity search limits defined by
VF_SEARCH_LIMIT_LOW and
VF_SEARCH_LIMIT_HIGH.

FLOW_OPERATING_MODE

Unsigned
Long

R/W

Determines which VF parameters to fix or calculate
during a VF calculation and whether or not to use
Linear/Log KW diff. Bit Mapped Values: 0: Dynamic
frequency adjust in auto run mode (original calculation)
1: Fixed frequency in auto run mode 2: Fixed blocks in
auto run mode 4: Dynamic Nyquist calculation enable 8:
Reserved for future use 16: Linear KW diff enable 32:
Log KW diff enable

FLOW_QUALITY_MODE

Unsigned
Long

R/W

0 selects original VF quality calculation* 1 selects new
VF quality calculation.

FLOW_ALGORITHM_DYNAMIC

FLOW_DATA_LENGTH

Unsigned
Long

R/W

Define number of blocks used for calculations.

FLOW_WINDOW_SIZE

Unsigned
Long

R/W

Number of points used in FFT. Actual FFT size is next
2^n higher value. Value of NFFT is zero padded to next
larger 2^n FFT size. This value is normally set by the
DSP.

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