ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/4,
1
/2 DIN and fieldmount 7 Advanced Level
78 IM/CM/ED–EN Rev. X
…Functions / …Math Blocks
Equation Setup
Source 1 (2) The source of the first operand in the equation (any analog or digital signal or user-defined
constant).
Source 1 (2)
Constant
Sets the constant value to be used.
Note. Applicable only if Source 1 is assigned to one of the constants.
Operator 1 (3)
End
Terminates the equation.
Add
Standard arithmetic functions.
Subtract
Multiply
Divide
Low Select
Result is the lower of the 2 operands.
High Select
Result is the higher of the 2 operands.
Median
If Median operators are used the median value calculated is dependent on the number of
operands:
The median value of 2 operands is their mean value.
The median value of 3 operands is the value of the middle operand when the
operands are sorted in ascending order.
The median value of 4 operands is the mean value of the 2
nd
and 3
rd
operands when
the 4 operands are sorted in ascending order.
Real Time Average Setup
Source 1 Selects the source for real time average value calculation – see Appendix A, page 104 for
description of sources.
Reset Source Selects the digital source required to reset the internal accumulative value and timer.
This does not change the immediate output of the math block but restarts the calculation of
the next average value.
Average Duration Sets the time duration the average is to be calculated over.
The output value of the math block is updated at this rate.
Max Hold / Min Hold Setup
Source 1 Selects the source for maximum / minimum value calculation – see Appendix A, page 104
for description of sources.
Reset Source Select the digital signal to be used to reset the maximum or minimum value.
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