time supervision conditions. Only if all conditions indicate a switch operation to be allowed, SXSWI
performs the execution command. In case of erroneous conditions, the function indicates an
appropriate "cause" value, see Table 476.
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 (SPC8GAPC),
for example.
Also, the health of the external equipment, the switch, can be monitored according to
IEC61850-8-1.
Local/Remote switch
M16494-6 v4
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
450.
From I/O switchLR
TRUE
FALSE
Local= Operation at
switch yard level
Remote= Operation at
IED or higher level
en05000096.vsd
IEC05000096 V1 EN-US
Figure 450: Local/Remote switch
Blocking principles
M16494-11 v6
SXSWI includes several blocking principles. The basic principle for all blocking signals is that they
will affect commands from all other clients for example, switch controller, protection functions
and autorecloser.
The blocking possibilities are:
• Block/deblock for open command. It is used to block operation for open command.
• Block/deblock for close command. It is used to block operation for close 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. If BLOCK signal is set, 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.
The above blocking outputs are stored in a non-volatile memory.
Substitution
M16494-21 v6
The substitution part in SXSWI is used for manual set of the position and quality of the switch. The
typical use of substitution is that an operator enters a manual value because the real process value
is erroneous of some reason. SXSWI will then use the manually entered value instead of the value
for positions determined by the process.
1MRK 502 066-UUS B Section 14
Control
853
Technical manual
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