D.2
SEL-734 Meter Instruction Manual Date Code 20090730
Setting SELOGIC Control Equations
SEL
OGIC Control Equations
SELOGIC Control
Equation Operators
SELOGIC 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 Table D.1.
Operators in a SEL
OGIC control equation setting are processed in the order
shown in Table D.1.
SELOGIC Control Equation Parentheses Operator ( )
More than one set of parentheses ( ) can be used in a SELOGIC 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.
SELOGIC 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.
SELOGIC 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).
Tab le D. 1 S E LOGIC 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
Courtesy of NationalSwitchgear.com
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