ABB ControlMaster CM15 User Manual page 65

ControlMaster CM15 and CMF160
Universal process indicator
...Functions / ...Math Blocks / ...Block Type
Equation
IM/CM/I–EN Rev. P
1
/ DIN
8
Enables an equation with up to 4 operands and 3 operators to be created. The operands can be
assigned to any analog or digital signal (see Appendix A, page 94). Digital signals have a value of
either '0' or '1'. With the exception of the Median operator, the equation is processed in a strict
left to right order, with no operator precedence.
The result of a math block can be used as the operand in another math block, enabling more
complex math equations to be constructed.
The math blocks are processed in ascending order; Math block 1 is processed first, then Math
Block 2, then 3 to 8:
Operator 1
Operand 1
Add, Subtract
Multiply, Divide
Low Select
Operand 2
High Select
Operand 3
Operand 4
Operator 2
Add, Subtract
Multiply, Divide
Operator 3
Low Select
High Select Add, Subtract
Multiply, Divide
Low Select
High Select
7 Advanced Level
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