ABB Relion 650 Series Technical Manual page 244

Section 8
Control
238
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 104.
From I/O switchLR
IEC05000096 V1 EN-US
Figure 104: 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, 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
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.
It is always possible to make a substitution, independently of the
position indication and the status information of the I/O board.
When substitution is enabled, the other signals related to the
position follow the substituted position. The substituted values are
stored in a non-volatile memory. If the function is blocked or
1MRK 511 424-UEN B
Local= Operation at
switch yard level
Remote= Operation at
IED or higher level
en05000096.vsd
Bay control REC650 2.2 IEC
M16494-11 v6
M16494-21 v7
Technical manual