Sel SEL-421 - Not; And; Or; R_Trig

R.3.27
Date Code 20111215 Reference Manual SEL-421 Relay
SELOGIC Control Equation Programming
SELOGIC Control Equation Operators
NOT
Use NOT to calculate the inverse of a Boolean value according to the truth
table shown in Table 3.22.
AND
Use AND to combine two Boolean values according to the truth table shown
in Table 3.23.
OR
Use OR to combine two Boolean values according to the truth table shown in
Tab le 3.24.
R_TRIG
R_TRIG is a time-based function that creates a pulse when another value
changes, as shown in Figure 3.9. Use R_TRIG to sense when a value changes
from logical 0 to logical 1 and take action only once when the value changes.
Table 3.22 NOT Operator Truth Table
Value A NOT A
01
10
Tabl e 3 . 23 AND O pe rat or Tr ut h Tabl e
Value A Value B A AND B
000
010
100
111
Table 3.24 OR Operator Truth Table
Value A Value B A OR B
000
011
101
111