Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page 77
3.12 Arithmetic block
The Arithmetic block is designed for using popular measurement math functions easily.
The math algorithm is selected by name and the type of function to be performed. The
block is used for calculating measurements from a combination of signals from the sensors.
The block must not be used in a control path. The block does not support process alarms.
The Arithmetic block supports the following functions:
• Flow compensation, linear
• Flow compensation, square root
• Flow compensation, approximate
• BTU flow
• Traditional Multiply Divide
• Average
• Traditional Summer
• Fourth order polynomial
• Simple HTG compensated level
• Fourth order Polynomial Based on PV
Figure 14: Arithmetic block
Execution
The block has five inputs, namely IN, IN_LO, IN_1, IN_2, and IN_3. The first two inputs
(IN, IN_LO) are designed for a range extension function that results in a Process Variable
(PV), with the status indicating the input in use.
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