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Cancel logic in SBO mode
3.4.2
In the SBO mode the reception of a cancel command is possible when the cancel conditions are
satisfied. Accordingly, the function can discard the select command; finally, the operation
returns to the initial stage (i.e., "Wait for a command".)
Receiving "Cancel" from the remote-end
(i)
Figure 3.4-4 depicts the cancel command procedure for a cancel command initiated from the
remote-end.
Wait for a command
Select logic
Command Reset from the
remote-end
Figure 3.4-4 Outline of 'cancel' command from the remote-end
Input signal required mapping
(ii)
Figure 3.4-6 depicts the cancel logic when a "Cancel command (Remote-Cancel)" signal is
applied to the LEDR function. The input-point "LEDR01_CONTROL_REQ" is the same the
same as that for the signal as shown in Figure 3.4-2.
Input
Command "Cancel"
528001 7007016D08
LEDR01_CONTROL_REQ
†Note: The criteria "unmatched conditions" are determined when the "Test-bit status" in
a command is not identical to the "IED test status".
Wait for a next command
Cancel by the remote-end
Signal reception in
IEC61850
Operate logic
Operate command
Operate logic
LEDR function (Function ID: 528001)
Cancel command
Unmatched condition
detected†
Figure 3.4-5 'Cancel' from the remote-end
- 369 -
Cancel
Cancel logic
decision
510001 7001016D08
Cancel logic in LEDR
&
&
6F2T0207 (0.01)
Success
Do nothing
Failed
Output
To "Wait for a command"
Successes to cancel
"Do nothing"
Operation Failed
GRE200 (5,6)
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