8-12
Front-Panel Interface
Date Code 20020129
SEL-387E Instruction Manual
Local Bits
In more specific terms, local control asserts (sets to logical 1) or deasserts (sets to logical 0) what
are called local bits LB1 through LB16. These local bits are available as Relay Word bits and
are used in SEL
OGIC
control equations.
Local control can emulate the following switch types in Figure 8.2 through Figure 8.4.
Logical 1
LBn
(n=1
through 16)
Relay
Word
Bit
ON
position
OFF
position (logical 0)
Figure 8.2: Local Control Switch Configured as an ON/OFF Switch
Logical 1
LBn
(n=1
through 16)
Relay
Word
Bit
OFF position
(logical 0)
MOMENTARY
position
Figure 8.3: Local Control Switch Configured as an OFF/MOMENTARY Switch
Logical 1
LBn
(n=1
through 16)
Relay
Word
Bit
ON
position
OFF
position (logical 0)
MOMENTARY
position
Figure 8.4: Local Control Switch Configured as an ON/OFF/MOMENTARY Switch
Local control switches are created by making corresponding switch position label settings.
These text label settings are set with the
SET
command or viewed with the
SHO
command via
the serial port. Refer to
SHO P (Show Port Settings)
in
Section 7: Serial Port Communications
and Commands
.
Table 8.1: Correspondence Between Local Control Switch Positions and Label Settings
Switch Position
Label
Setting
Setting Definition
Logic State
not applicable
NLBn
Name of Local Control Switch
not applicable
ON SLBn
“Set” Local bit LBn
logical 1
OFF CLBn
“Clear” Local bit LBn
logical 0
MOMENTARY PLBn
“Pulse” Local bit LBn
logical 1 for one
processing interval
Note that the first setting in Table 8.1 (NLBn) is the overall switch name setting.
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