Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

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7.6
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Inputs, Outputs, Timers, and Other Control Logic
Local Control Switches
Local Control Switches
The local control switch feature of this relay replaces traditional panel-
mounted control switches. Operate the sixteen (16) local control switches
using the front-panel keyboard/display (see
Section 11: Front-Panel
Interface ).
The switch representation in this figure is derived from the standard: Graphics
Symbols for Electrical and Electronics Diagrams IEEE Std 315-1975, CSA Z99-1975,
ANSI Y32.2-1975, 4.11 Combination Locking and Nonlocking Switch, Item 4.11.1.
Figure 7.4 Local Control Switches Drive Local Bits LB1 Through LB16
The output of the local control switch in Figure 7.4 is a Relay Word bit LB n
( n = 1 through 16), called a local bit. The local control switch logic in
Figure 7.4 repeats for each local bit LB1–LB16. Use these local bits in
SEL
OGIC
control equations. For a given local control switch, the local control
switch positions are enabled by making corresponding label settings.
Note the first setting in Table 7.1 (NLB n ) is the overall switch name setting.
Make each label setting through the serial port using the command SET T .
View these settings using the serial port command SHO T (see Section 9:
Setting the Relay and Section 10: Serial Port Communications and
Commands ).
Local Control Switch
Types
Configure any local control switch as one of the following three switch types:
ON/OFF Switch
Local bit LB n is in either the ON (LB n = logical 1) or OFF (LB n = logical 0)
position.
Table 7.1 Correspondence Between Local Control Switch Positions and Label
Settings
Switch Position Label Setting Setting Definition Logic State
not applicable NLB n Name of Local
Control Switch
not applicable
ON SLB n “Set” Local bit LB n logical 1
OFF CLB n “Clear” Local bit LB n logical 0
MOMENTARY PLB n “Pulse” Local bit LB n logical 1 for
one processing interval
Logical 1
LBn
(n = 1 through 16)
ON Position
(Maintained Logical 1 Position)
OFF Position
(Maintained Logical 0 Position)
MOMENTARY Position
(Logical 1 for One Processing Interval)
Relay
Word
Bit