4.200
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Logic Settings (SET L Command)
Boolean Comparison Operators (<, >, <=, and >=)
Comparisons are mathematical operations that compare two numerical values,
with the result being a logical 0 (if the comparison is not true) or logical 1 (if
the comparison is true). Thus, what starts out as a mathematical comparison
ends up as a Boolean resultant. For example, if the output of a math variable is
above a certain value, an output contact is asserted:
OUT103 :=
MV01 > 8
If the math variable (MV01) is greater than 8, output
contact OUT103 asserts (OUT103 := logical 1). If the math variable (MV01)
is less than or equal to 8, output contact OUT103 deasserts
(OUT103 := logical 0).
Boolean Equality (=) and Inequality (<>) Operators
Equality and inequality operators operate similarly to the comparison
operators. These are mathematical operations that compare two numerical
values, with the result being a logical 0 (if the comparison is not true), or
logical 1 (if the comparison is true). Thus what starts out as a mathematical
comparison ends up as a Boolean resultant. For example, if the output of a
math variable is not equal to a certain value, an output contact asserts:
OUT102 :=
MV01 <> 45
If the math variable (MV01) is not equal to 45, output
contact OUT102 asserts (effectively OUT102 := logical 1). If the math
variable (MV01) is equal to 45, output contact OUT102 deasserts (effectively
OUT102 := logical 0). Table 4.57 shows other operators and values that you
can use in writing SEL
OGIC
control equations.
Timers Reset When
Power Lost or
Settings Changed
If the device loses power or the settings change, the SEL
OGIC
control equation
variables/timers reset. Relay Word bits SVn and SVnT (n = 01–32) reset to
logical 0 after power restoration or a settings change. Figure 4.137 shows an
effective seal-in logic circuit, created by the use of Relay Word bit SV07
(SEL
OGIC
control equation variable SV07) in SEL
OGIC
control equation SV07:
SV07 :=
(SV07 OR OUT101) AND (OUT102 OR OUT401)
Figure 4.137
Example Use of SEL
OGIC
Variables/Timers
Table 4.57
Other SEL
OGIC
Control Equation Operators/Values
Operator/
Value
Function
Function Type
(Boolean and/or
Mathematical)
0
Set SEL
OGIC
control equation directly to logical 0
(XXX := 0)
Boolean
1
Set SEL
OGIC
control equation directly to logical 1
(XXX := 1)
Boolean
#
Characters entered after the # operator are not
processed and are deemed as comments
Boolean and
Mathematical
\
Indicates that the preceding logic should be
continued on the next line (“\” is entered only at the
end of a line)
Boolean and
Mathematical
SV06PU
SV06D0
SV07PU
SV07D0
SV06
SV07
OUT101
OUT102
OUT103
OUT401
OUT101
OUT102
OUT401
Summary of Contents for SEL-700G Series
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