
8.7
Date Code 20090730
Instruction Manual
SEL-734 Meter
Logic
Latch Bits
This
ALARM
output contact logic is implemented in the following SEL
OGIC
control equation settings and is displayed in
. Note that the figure
includes an extra timer that is not included in the settings. This timer will be
used in the next example.
shows the timing for this example.
SET01 :=
(R_TRIG IN102) AND (NOT LT01)
RST01 :=
(R_TRIG IN102) AND LT01
OUT103 :=
NOT (SALARM OR HALARM) OR (NOT LT01)
Figure 8.7
Single Input to Control ALARM
Figure 8.8
Latch Control Switch Operation Time Line
A variation of the previous example adds more security by adding a timer with
equal pickup/dropout times as shown in
. Suppose that SV06PU and
SV06DO are both set to 5 seconds. Then the SV06T timer keeps the state of
latch bit LT01 from being able to be changed at a rate faster than once every 5
seconds.
shows the timing for this example.
SV06 :=
LT01
SET01 :=
(R_TRIG IN102) AND (NOT SV06T)
RST01 :=
(R_TRIG IN102) AND SV06T
OUT103 :=
NOT (SALARM OR HALARM) OR (NOT LT01)
that the latch control switch output (latch bit LT01) uses
feedback for SEL
OGIC
control equation settings SET01 and RST01. The
feedback of latch bit LT01 determines whether input IN102 operates the
LT01
NOT LT01
IN102
(Set)
(Reset)
SET01
RST01
SEL
OGIC
Setting
SEL
OGIC
Setting
SEL
OGIC
Setting
Meter
Word
Bit
Meter
Word
Bit
Meter
Word
Bit
Meter
Word
Bits
SV06PU
SV06D0
SV06T
R_TRIG
Latch Bit
SV06
SALARM
HALARM
OUT103
RST01
R_TRIG IN102
IN102
SET01
LT01
Rising
Edge
One
Processing
Interval
Rising
Edge
Rising
Edge
Rising
Edge
Summary of Contents for SEL-734
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