ABB REC650 Technical Manual page 263

1MRK 511 287-UEN A
Technical manual
indicate a switch operation to be allowed, SXSWI performs the execution command.
In case of erroneous conditions, the function indicates an appropriate "cause" value.
SXSWI has an operation counter for closing and opening commands. The counter
value can be read remotely from the operator place. The value is reset from a binary
input or remotely from the operator place by configuring a signal from the Single Point
Generic Control 8 signals (SPC8GGIO) for example.
Local/Remote switch
One binary input signal LR_SWI is included in SXSWI to indicate the local/remote
switch position from switchyard provided via the I/O board. If this signal is set to
TRUE it means that change of position is allowed only from switchyard level. If the
signal is set to FALSE it means that command from IED or higher level is permitted.
When the signal is set to TRUE all commands (for change of position) from internal
IED clients are rejected, even trip commands from protection functions are rejected.
The functionality of the local/remote switch is described in figure 124.
From I/O switchLR
IEC05000096 V1 EN
Figure 124: Local/Remote switch
Blocking principles
SXSWI includes several blocking principles. The basic principle for all blocking
signals is that they will affect commands from all other clients for example, operators
place, protection functions, autorecloser and so on.
The blocking possibilities are:
• Block/deblock for open command. It is used to block operation for open
command. Note that this block signal also affects the input OPEN for immediate
command.
• Block/deblock for close command. It is used to block operation for close
command. Note that this block signal also affects the input CLOSE for immediate
command.
• Update block/deblock of positions. It is used to block the updating of position
values. Other signals related to the position will be reset.
• Blocking of function, BLOCK, signal from DO (Data Object) Behavior (IEC
61850). If DO Behavior is set to "blocked" it means that the function is active, but
no outputs are generated, no reporting, control commands are rejected and
functional and configuration data is visible.
Local= Operation at
switch yard level
Remote= Operation at
IED or higher level
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Section 10
Control
257