Arithmetic function block diagram exampleFigure 7-27:
This application can be applied to very large storage tanks whose contents are subject to
thermal expansion and contraction during seasonal changes in temperature.
7.11 Advanced topics
7.11.1 Arithmetic types
The parameter ARITH_TYPE determines how PV and the compensation terms (t) are
combined. You may select from nine commonly used math functions depected below.
COMP_HI and COMP_LO are compensation limits.
If there is a divide by zero and the numerator is positive, f is set to COMP_HI; if the
numerator is negative, then f is set to COMP_LO.
The square root of a negative value will equal the negative of the square root of the
absolute value. Imaginary roots are not supported.
Foundation Fieldbus
Reference Manual 179
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