R.3.6
SEL-421 Relay Reference Manual Date Code 20111215
SELOGIC Control Equation Programming
SELOGIC Control Equation Setting Structure
EXAMPLE 3.3 Boolean and Math SELOGIC Control Equations
The equations below are examples of Boolean SEL
OGIC control
equations.
# Example Boolean SELOGIC control equations
PSV01 := IN101 # Store the value of IN101 in PSV01
PSV02 := IN101 AND RB03 # Store result of logical AND in PSV02
PST01IN := IN104 # Use IN104 as the input value for PST01
PSV03 := PMV33 >= 7 # Set PSV03 when PMV33 greater than or equal to 7
The lines below are examples of math SELOGIC control equations.
# Example math SELOGIC control equations
PMV01 := 5 # Store the constant 5 in PMV01
PMV02 := 0.5 * VAFM # Store the product of A-phase voltage and 0.5 in
PMV02
Comments
Include comment statements in SELOGIC control equations to help document
SEL
OGIC control equation programming. You can start a comment anywhere
in a SEL
OGIC control equation with the # character. The comment then
continues to the end of the line. If you begin a SEL
OGIC control equation with
a comment character, then the entire line is a comment.
NOTE: During troubleshooting or
testing, reenter a line and insert the
comment character to disable it.
Enter the line without the comment
character to enable the line later
when you want it to be executed.
Comments are a powerful documentation tool for helping both you and others
understand the intent of programming and configuration in the SEL-421. You
can use comments liberally; comments do not reduce SEL
OGIC control
equation execution capacity.
SELOGIC Control Equation Setting Structure
The SEL-421 uses SELOGIC control equations in three major areas. First, you
can customize protection operations with SEL
OGIC control equation settings
and free-form programming. Second, there is a free-form programming area
for more sophisticated automation SEL
OGIC control equation programming.
Third, there is a fixed area for relay output programming. The SEL
OGIC
control equation programming areas are shown in Figure 3.2. There are also a
small number of fixed SEL
OGIC control equations in other settings areas
including front-panel settings that allow you to customize relay features not
directly related to protection or automation.
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