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ControlMaster CM30, CM50 and CMF310
Universal process controllers,
1
/
4
,
1
/
2
DIN and fieldmount
7 Advanced Level
76
IM/CM/ED–EN Rev. X
7.8 Functions
Contains parameters for setting up the math block(s), logic equations and timer
functions within the controller.
Logic Equations
Up to 8 logic equations can be configured. Each equation can combine a maximum of 8
operands (digital signals) with 7 operators.
The elements of each equation are calculated sequentially. Operand 1, Operator 1 and
Operand 2 are evaluated first and the result is combined with Operator 2 and Operand 3.
This result is then combined with the next operator and operand and so on to the end of the
equation.
Setting an operator to
END
terminates the equation.
Notes
. 2 Logic equations are required to perform an exclusive
OR
of 3 inputs.
As part of the cascade template, logic equation 1 is preconfigured.
Changes to this equation will result in the cascade template not functioning correctly.
Key:
OR
Output is 1 if either or both inputs are 1; output is 0 if both inputs are 0
AND
Output is 1 if both inputs are 1; output is 0 if either input is 0
NOR
Output is 0 if either or both inputs are 1; output is 1 if both inputs are 0
NAND Output is 0 if both inputs are 1; output is 1 if either input is 0
EXOR
Output is 0 if both inputs are 0 or both inputs are 1; output is 1 if one input is 1 and the other is 0
END
Terminates the equation
Note
. If any of the operand sources are invalid (for example, an alarm that is not configured),
the logic equation output state is zero and invalid.
Equation Number
Selects the logic equation (1 to 8) to be configured.
Operand 1 (8)
See Appendix A, page 104 for description of sources.
Invert 1 (8)
Logically inverts (applies
NOT
function to) the digital signal.
For example, if the digital signal assigned to the operand has a state of '1' it is inverted to a
state of '0' before being applied to the equation.
Operator1 (7)
Selects the operator type (
OR, AND, NOR, NAND, EXOR
). Select
END
if no more elements
are required.
Menu
Functions
Exit
Select
OR, AND
NOR, NAND
EXOR, END
OR, AND
NOR, NAND
EXOR, END
OR, AND
NOR, NAND
EXOR, END
OR, AND
NOR, NAND
EXOR, END
Operand 1
Operand 2
Operand 3
Operand 4
Operand 5
Operator 1
Operator 2
Operator 3
Operator 4