4-80 BE1-951 Protection and Control 9328900990 Rev L
At the top center of the BESTlogic Function Element screen is a pull-down menu labeled Logic. This
menu allows viewing of the BESTlogic settings for each preprogrammed logic scheme. User must
be
selected on this menu in order to allow changes to the mode and inputs of the element.
Enable the Virtual Breaker Control 101 element by selecting its mode of operation from the Mode pull-
down menu. Select Done when the settings have been completely edited.
Table 4-45 summarizes the BESTlogic settings for Virtual Breaker Control Switch.
Table 4-45. BESTlogic Settings for Virtual Breaker Control Switch
Function Range/Purpose Default
Mode 0 = Disable, 1 = Enable 0
Example 1. Make the following BESTlogic settings to the Virtual Breaker Control 101 element.
Figure
4-75 illustrates these settings.
Logic: User
Mode: Enable
Select Before Operate Control of Virtual Breaker Control Switch
The state of the virtual breaker control switch can be controlled at the HMI through Screen 2.2.1. Control
is also possible through the ASCII command interface by using the select-before-operate commands CS-
101 (control select-virtual control switch) and CO-101 (control operate-virtual control switch). This cannot
be done using BESTCOMS. A state change takes place immediately without having to execute an EXIT –
SAVE settings command.
CS/CO-101 Command
Purpose: Select and operate the virtual control switches.
Syntax: CS/CO-101[=<action>]
Comments: x = no entry for 43, 1 for 143, 2 for 243, or 3 or 343
Action = T to pulse the 101T output
C to pulse the 101C output
The virtual breaker control switch commands require the use of select-before-operate logic. First, the
command must be selected using the CS-101 command. After the select command is entered, there is a
30 second window during which the CO-101 control command will be accepted. The control selected and
the operation selected must match exactly or the operate command will be blocked. If the operate
command is blocked, an error message is output.
CS/CO Command Examples:
Example 1. Read the current status of the virtual control switch.
>CO-101
C
The returned setting indicated that the switch is in the after-close state.
Example 2. Trip the breaker by closing the trip output of the virtual control switch.
>CS-101=T
101=T SELECTED
>CO-101=T
101=T EXECUTED
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