Sel 411L - Table 14.6 First Execution Bit Operation on Power-Up

P.14.12
SEL-411L Relay Protection Manual Date Code 20151029
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Elements
Relay Word Bits and
Analog Quantities
Data within the relay are available for use in SELOGIC control equations.
Relay Word bits are binary data that include protection elements, input status,
and output status. Section 16: Relay Word Bits contains a list of Relay Word
bits available within the relay. Analog quantities are analog values within the
relay including measured and calculated values. Section 17: Analog
Quantities contains a list of analog quantities available within the relay.
Special Condition Bits
Several Relay Word bits are available for special conditions related to
SEL
OGIC control equation programming in the relay. You can use these bits in
SEL
OGIC control equation programming to react to these conditions. You can
also send these bits to other devices through relay interfaces including
M
IRRORED BITS communications and DNP3. The special condition bits are
shown in Table 14.6.
The relay sets the first execution bits, AFRTEXA, AFRTEXP, and PFRTEX,
momentarily to allow you to detect changes in the relay operation. The relay
sets these bits and clears them as described in Table 14.6–Table 14.8. You can
use these bits to force logic and calculations to reset or take a known state on
power-up or settings change operations.
Table 14.5 Summary of SELOGIC Control Equation Elements
Element Description
Relay Word bits Boolean value data
Analog quantities Received, measured, and calculated values
Special condition bits Bits that indicate special SEL
OGIC control
equation execution conditions
SEL
OGIC control equation variables Storage locations for the results of Boolean
SELOGIC control equations
SEL
OGIC control equation math variables Storage locations for the results of math
SEL
OGIC control equations
Latch bits Nonvolatile storage for the results of Bool-
ean SEL
OGIC control equations
Conditioning timers Pickup and dropout style timers similar to
those used in SEL-300 series relays
Sequencing timers On-delay timers similar to those used in
programmable logic controllers
Counters Counters that count rising edges of Boolean
value inputs
Table 14.6 First Execution Bit Operation on Power-Up
Name Description
AFRTEXA Relay sets on power-up and clears after each automation program-
ming block has been executed once.
AFRTEXP Relay sets on power-up. Relay clears after it enables protection and
all automation programming blocks have been executed once.
PFRTEX Relay sets on power-up. Relay clears after protection runs for one
cycle.