
D.2
SEL-734 Meter
Instruction Manual
Date Code 20090730
Setting SEL
OGIC
Control Equations
SEL
OGIC
Control Equations
SEL
OGIC
Control
Equation Operators
SEL
OGIC
control equation settings use logic similar to Boolean algebra logic,
combining Meter Word bits together through use of one or more of the six
SEL
OGIC
control equation operators listed in
.
Operators in a SEL
OGIC
control equation setting are processed in the order
.
SEL
OGIC
Control Equation Parentheses Operator ( )
More than one set of parentheses ( ) can be used in a SEL
OGIC
control
equation setting. For example, the following SEL
OGIC
control equation setting
has two sets of parentheses:
SV7 = (SV07 OR IN101) AND (MV01 OR OUT103)
In the above example, the logic within the parentheses is processed first and
then the two resultants are ANDed together. Parentheses cannot be nested
(parentheses within parentheses) in a SEL
OGIC
control equation setting.
SEL
OGIC
Control Equation NOT Operator
The NOT operator is applied to a single Meter Word bit and to multiple
elements (within parentheses). Following are examples of both.
EXAMPLE D.1
Default LED Logic
T01_LED := NOT 27A
LED1 is lit when 27A is not asserted (logic 0). When 27A asserts
(logic 1), LED1 turns off.
EXAMPLE D.2
Alarm Output Using the NOT Operator
OUT401 := NOT (HALARM OR SALARM)
OUT401 is asserted (logic 1) when HALARM and SALARM Meter Word
bits are deasserted. This setup can be used to make an alarm contact.
SEL
OGIC
Control Equation Rising Edge Operator R_TRIG
The rising edge operator R_TRIG is applied to individual Meter Word bits
only, not to groups of elements within parentheses. For example, the SEL
OGIC
control equation event report generation setting uses rising edge operators:
ER :=
R_TRIG OUT103
The Meter Word bit in this setting example is: OUT103 (Output contact
OUT103
).
Table D.1
SEL
OGIC
Control Equation Operators (Listed in Processing Order)
Operator
Logic Function
R_TRIG
rising edge detect
F_TRIG
falling edge detect
( )
parentheses
NOT
NOT
AND
AND
OR
OR
Содержание SEL-734
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