Sel 411L - Table 14.21 Parentheses Operation in Boolean Equation; Table 14.22 NOT Operator Truth Table; Table 14.23 and Operator Truth Table

P.14.26
SEL-411L Relay Protection Manual Date Code 20151029
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Operators
Parentheses
Use paired parentheses to control the execution order of operations in a
SEL
OGIC control equation. Use as many as 14 nested sets of parentheses in
each SEL
OGIC control equation. The relay calculates the result of the
operation on the innermost pair of parentheses first and then uses this result
with the remaining operations. Table 14.21 is a truth table for an example
operation that illustrates how parentheses can affect equation evaluation.
NOT
Use NOT to calculate the inverse of a Boolean value according to the truth
table shown in Table 14.22.
AND
Use AND to combine two Boolean values according to the truth table shown
in Table 14.23.
R_TRIG Rising-edge trigger
F_TRIG Falling-edge trigger
>, <, =, <=, >=, <> Comparison of values
Ta b l e 1 4 .2 0 B o o l e a n O p e ra to r S um m a r y (Sheet 2 of 2)
Operator Description
Table 14.21 Parentheses Operation in Boolean Equation
A B C
A AND B
OR C
A AND
(B OR C)
00000
00110
01000
01110
10000
10111
11011
11111
Table 14.22 NOT Operator Truth Table
Value A NOT A
01
10
Table 14.23 AND Operator Truth Table
Value A Value B A AND B
000
010
100
111