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Function Blocks
AGA3O Function Block
Revision 11
HC900 Hybrid Control Designer Function Block Reference Guide
29
2/07
AGA3O Function Block
Description
The
AGA3O
label stands for
Orifice AGA3 Meter Calculation
.
AGA8 BLK
CONNECT
This block is part of the
Calculations
category.
Function
Calculations for Orifice Metering
- When connected to an AGA8 block, the input value and multiple
related parameters will be obtained from the AGA8 block. The meter block will use this information to
inherit the AGA8 block data for use in the calculations.
Inputs
AGA8 BLK CONNECT
= When connected to an AGA8 block, the input value will equal the block
number of the AGA8 block. The meter block will use this information to inherit the AGA8 block data for
use in the calculations. If the input pin is not connected to an AGA8 block, then ERR and STATUS output
pins are updated accordingly.
DISABLE
= When this pin is ON, the block is disabled, the process value outputs are set to 0, the
ERR/WARN pins are OFF, and the STATUS pin is set to 99 (See
H
Table 5 AGA Error Codes).
Output
QV
= Corrected volume flow rate at flowing conditions (Tf,Pf) in the units selected by the UNITS
configuration parameter. Output units are ft3/hr for U.S.; m3/hr for metric.
QB
= Corrected volume flow rate at Base (or Contract) pressure and temperature in the units selected by
the UNITS configuration parameter. The base or contract conditions are specified by TB and PB in the
companion compressibility block. Output units are ft3/hr for U.S.; m3/hr for metric.
QM
= Mass flow rate in the units selected by the UNITS configuration parameter. Units are lbm/hr for U.S.
and kg/hr for metric.
QH
= Energy flow rate in the units selected by the UNITS" Units are MBTU/hr for U.S. and MJ/hr for
metric
ERR
= Set when calculation status is indicating an error condition. Errors indicate a fatal condition. The
output values in this case will be set to 0 and the error pin turned on until configuration is corrected or
operating conditions return to normal.
WARN
= Set when calculation status is indicating a warning condition - Warnings indicate that the
configured or running conditions are outside of the tolerance for the AGA calculations being performed.
Values will still be calculated but should be viewed as out of tolerance.
STATUS
= a status number is placed on this pin which can be used to find the error in the error/warning
lookup table.(See
H
Table 5 AGA Error Codes) This enables the user to connect the pin to comparator
blocks to distinguish various error/warning conditions in the function block configuration.
Содержание HC900
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