13.10
SEL-400 Series Relays Instruction Manual Date Code 20171006
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Elements
SELOGIC Control Equation Variables
There are two types of SELOGIC control equation variables: Boolean and math.
SELOGIC Control Equation Boolean Variables
SELOGIC control equation Boolean variables are binary storage locations. Each
variable equals either logical 1 or logical 0. This manual refers to these variables
and the relay displays these as 1 and 0, respectively. Think also of the states 1 and
0 as True and False, respectively, when you evaluate Boolean logic statements.
The quantities of SEL
OGIC control equation Boolean variables available in the
different programming areas are listed in Table 13.5.
Use the SELOGIC control equation Boolean variables in freeform logic state-
ments in any order you want. Use a SEL
OGIC control equation Boolean variable
more than once in freeform logic programming, and use SEL
OGIC control equa-
tion Boolean variables as arguments in SEL
OGIC control equations. Example 13.4
illustrates SEL
OGIC control equation variable usage. You can view the status of
individual control equation Boolean bits in the Relay Word using the TARGET
Table 13.2 First Execution Bit Operation on Power-Up
Name Description
AFRTEXA Relay sets on power-up and clears after each automation programming block
has been executed once.
AFRTEXP Relay sets on power-up. Relay clears after it enables protection and all auto-
mation programming blocks have been executed once.
PFRTEX Relay sets on startup. Relay clears after protection runs for 1 cycle.
Table 13.3 First Execution Bit Operation on Automation Settings Change
Name Description
AFRTEXA Relay sets on settings change and clears after each automation programming
block has been executed once.
AFRTEXP Relay sets on settings change. Relay clears after it enables protection and all
automation programming blocks have been executed once.
PFRTEX Relay sets on settings change. Relay clears after protection runs for 1 cycle.
Table 13.4 First Execution Bit Operation on Protection Settings Change, Group
Switch, and Source Selection
Name Description
AFRTEXA Relay does not set.
AFRTEXP Relay sets when listed event occurs. Relay clears after it enables protection
and all automation programming blocks have been executed once.
PFRTEX Relay sets when listed event occurs. Relay clears after protection runs for 1
cycle.
Ta b l e 1 3. 5 SE LOGIC Control Equation Boolean Variable Quantities
Type Typ ical Quan tity Name Range
Protection SELOGIC control equation
Boolean variables
64 PSV01–PSV64
Automation SEL
OGIC control equation
Boolean variables
256 ASV001–ASV256
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