4.5
Date Code 20020903
SEL-587Z Instruction Manual
Control Logic
Local Control Switches (NLBn, SLBn, CLBn, PLBn)
Local Control Switches (NLBn, SLBn, CLBn, PLBn)
Local control switches (local bits) emulate traditional panel switches and are
operated via the front-panel pushbuttons and display. By pushing the CNTRL
pushbutton, the front-panel pushbuttons are reassigned new functions to
behave as panel switches (see
Local Control on page 8.8 in Section 8: Front-
). Local control switches differ from remote control switches
in that you can only operate the local control switch via the front-panel
pushbuttons and display; you can only operate the remote control switches via
serial communications.
Figure 4.3
Local Control Switches Drive Local Bits LB1 Through LB8.
There are eight local control switches; the output of each switch (one switch is
shown in
) is a Relay Word bit (local bit LB
n
,
n
= 1 through 8). Use
these local bits in SEL
OGIC
control equations.
To enable the local bits, enter a text string, called “labels,” using the
SET T
command. Making corresponding label settings enables other positions of the
same local control switch. Each label is displayed on the front panel according
to the step in the procedure. For example, assume the NLB1 label is “HV
BRKR.” During the circular display, the message “HV BRKR” is shown on
the display. Choose meaningful, unambiguous labels, as these identify the
switch and communicate the switch “instructions” to the operator.
Table 4.1
Control Switch Position,
Label Settings, and Local Control Switch State
Switch Position
Label Setting
Setting Definition
Logic State
N/A
NLB
n
“Name” LB
n
–Enable
Switch
N/A
CLOSED
SLB
n
“Set” Local Bit LB
n
logical 1
OPEN
CLB
n
“Clear” Local Bit LB
n
logical 0
MOMENTARY
PLB
n
“Pulse” Local Bit LB
n
logical 1 for one
processing interval
ON position
(maintained
logical 1
position)
OFF position
(maintained
logical 0
position)
MOMENTARY position
(logical 1 for one
processing interval)
Logical 1
LBn
(n=1 through 8)
Relay
Word
Bit
Содержание SEL-587Z
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