4-56
Protection and Control
BE1-951
Figure 4-38. 101 Element
D2843-15.vsd
02-02-99
0
1
0
0
1
1
101T
1 0 1 C
1 0 1 S C
200 ms
200 ms
Figure 4-39. 101 Control Switch State Diagram
CS/CO-x43 Command
Purpose:
Select and operate the virtual selector switches.
Syntax:
CS/CO-<x>43[=<Action>]
Comments: x = no entry for 43, 1 for 143, 2 for 243, or 3 for 343
Action = 0 to open the switch, 1 to close the switch, P to pulse the switch to the opposite state
for 200 milliseconds, and then automatically return to starting state.
The virtual switch control commands require the use of select-before-operate logic. First, the command must
be selected using the CS-x43 command. After the select command is entered, there is a 30 second window
during which the CO-x43 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, and error
message is output.
CS/CO-x43 Command Examples
1.
Read the current status of virtual switch 43.
>CO-43
0
2.
Momentarily toggle the state of switch 43 to closed.
>CS-43=P
43=P SELECTED
>CO-43=P
43=P EXECUTED
3.
An example of an operate command not matching the select command.
>CS-743=P
743=P SELECTED
>CO-743=1
ERROR:NO SELECT
Retrieving Virtual Selector Switch Status Information from the Relay
The state of each virtual selector switch can be determined from HMI screen 1.5.4. This information is also
available through the ASCII command interface by using the RG-STAT command. See Section 6,
Reporting
and Alarm Functions, General Status Reporting for more information.
HMI screens 2.1.1 through 2.1.4 provide switch control and can also display the current status of their
respective switches. ASCII command CO-x43 returns the state of each virtual selector switch in a read-only
mode. See the previous Example 1.
101 Virtual Breaker Control Switch
The virtual breaker control switch (shown in Figure 4-38) provides manual control of a circuit breaker or
switch without using physical switches and/or interposing relays. Both local and remote control is possible.
A virtual switch can be used instead of a physical switch to reduce costs with the added benefit that the
