4.198
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Logic Settings (SET L Command)
Parentheses Operator ( )
You can use more than one set of parentheses in a SEL
OGIC
control equation
setting. For example, the following Boolean SEL
OGIC
control equation setting
has two sets of parentheses:
SV04 :=
(SV04 OR IN102) AND (PB01_LED OR RB01)
In the previous example,
the logic within the parentheses is processed first and then the two parentheses
resultants are ANDed together. Use as many as 14 sets of parentheses in a
single SEL
OGIC
control equation setting. You can “nest” parentheses within
parentheses.
Math Negation Operator (–)
The negation operator – changes the sign of a numerical value. For example:
MV01 :=
RB01
When Remote bit RB01 asserts, Math variable MV01 has a
value of 1, that is, MV01 := 1. We can change the sign on MV01 with the
following expression:
MV01 := –
1 * RB01
Now, when Remote bit RB01 asserts, Math variable
MV01 has a value of –1, that is, MV01 := –1.
Boolean NOT Operator (NOT)
Apply the NOT operator to a single Relay Word bit and to multiple elements
(within parentheses).
An example of a single Relay Word bit is as follows:
SV01 :=
NOT RB01
When Remote bit RB01 asserts from logical 0 to
logical 1, the Boolean NOT operator, in turn, changes the logical 1 to a
logical 0. In this example, SV01 deasserts when RB01 asserts.
Following is an example of the NOT operator applied to multiple elements
within parentheses.
The Boolean SEL
OGIC
control equation OUT101 setting could be set as
follows:
OUT101 :=
NOT(RB01 OR SV02)
If both RB01 and SV02 are deasserted (=
logical 0), output contact OUT101 asserts. That is, OUT101 := NOT (logical 0
OR logical 0) := NOT (logical 0) := logical 1.
In a Math SEL
OGIC
control equation, use the NOT operator with any Relay
Word bits. This allows a simple if/else type equation, as shown in the
following example.
+
-
add
subtract
Mathematical
<, >, <=, >=
comparison
Boolean
=
<>
equality
inequality
Boolean
AND
AND
Boolean
OR
OR
Boolean (lowest
precedence)
Table 4.56
SEL
OGIC
Control Equation Operators (Listed in Operator
Precedence)
(Sheet 2 of 2)
Operator
Function
Function Type (Boolean
and/or Mathematical)
Summary of Contents for SEL-700G Series
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