BE1-951
Protection and Control
4-55
Figure 4-37. x43 Element
is accepted. Because switch status information is saved in nonvolatile memory, the relay powers up with the
switches in the same state as when the relay was powered down.
Each virtual selector switch element (see Figure 4-37) has one output: 43, 143, 243, or 343. The output is
TRUE when the switch is in the closed state; the output is FALSE when the switch is the open state. Since
both the output and the inverse of the output of these switches can be used as many times as desired in
your programmable logic, they can emulate a switch with as many normally open and normally closed decks
as desired.
User specified labels can be assigned to each virtual switch and
to both states of each switch. In the previous ground cutoff
switch example, you might enable one of the switches in
BESTlogic as Mode 2, ON/OFF and connect the output of that
switch, to the blocking input of the 59X/159X protection element.
This would disable the ground overvoltage protection when the
switch is closed (logic 1) and enable it when the switch is open
(logic 0). For the application, you might set the switch label to be
59N_CUTOFF (10 character maximum). The closed position on
the switch might be labeled DISABLD (7 character maximum)
and the open position might be labeled NORMAL. Section 7,
BESTlogic has more details about setting user programmable
names for programmable logic variables.
BESTlogic Settings for x43 Virtual Selector Switches
The virtual selector switch logic settings are listed in Table 4-43. These settings enable the x43 element by
selecting the mode of operation. There are no logic inputs.
Table 4-43. x43 Virtual Selector Switch BESTlogic Settings
Function
Range/Purpose
Default
Mode
0 = Disabled
2 = On/Off
1 = On/Off/Pulse
3 = Off/Momentary On
0
BESTlogic settings can be made through the ASCII command interface using the SL-x43 (settings logic-x43
switch) command.
SL-x43 Command
Purpose:
Read or set virtual switch logic.
Syntax:
SL-<x>43[=<Mode>]
Comments: x = no entry for 43, 1 for 143, 2 for 243, or 3 for 343. See Table 4-43 for SL-x43 settings
information.
SL-x43 Command Example
1.
Read the logic setting for the 43 virtual selector switch.
>SL-43
3
This mode setting indicates that the switch is set for OFF/Momentary ON operation.
Select Before Operate Control of Virtual Selector Switches
The state of each virtual selector switch can be controlled at the HMI through screens 2.1.1 through 2.1.4.
Control is also possible through the ASCII command interface by using the select-before-operate commands
CS-x43 (control select-virtual switch) and CO-x43 (operate select-virtual switch). A state change takes place
immediately without having to execute an exit-save settings command.
