Local panel switch
M13446-7 v7
The local panel switch is a switch that defines the operator place selection. The switch connected
to this function can have three positions (remote/local/off). The positions are here defined so
that remote means that operation is allowed from station and/or remote level and local means
that operation is allowed from the IED level. The local/remote switch is also on the control/
protection IED itself, which means that the position of the switch and its validity information are
connected internally, not via I/O boards. When the switch is mounted separately from the IED the
signals are connected to the function via I/O boards.
When the local panel switch (or LHMI selection, depending on the set source to select this) is in Off
position, all commands from remote and local level will be ignored. If the position for the local/
remote switch is not valid the PSTO output will always be set to faulty state (3), which means no
possibility to operate.
To adapt the signals from the local HMI or from an external local/remote switch, the function
blocks LOCREM and LOCREMCTRL are needed and connected to QCBAY.
Permitted Source To Operate (PSTO)
M13446-16 v8
The actual state of the operator place is presented by the value of the Permitted Source To
Operate, PSTO signal. The PSTO value is evaluated from the local/remote switch position
according to Table
482. In addition, there are two parameters that affect the value of the PSTO
signal.
If the parameter
AllPSTOValid
is set and LR-switch position is in Local or Remote state, the PSTO
value is set to 5 (all), that is, it is permitted to operate from both local and remote level without
any priority. When the external panel switch is in Off position the PSTO value shows the actual
state of the switch that is, 0. In this case it is not possible to control anything
If the parameter
RemoteIncStation
is set and the LR-switch position is in Remote state, the PSTO
value is set to 2 (Station or Remote), that is, it is permitted to operate from both station and
remote level without any priority.
Table 482: PSTO values for different Local panel switch positions
Local panel
switch
positions
PSTO
value
AllPSTOValid
(setting
parameter)
RemoteInc
Station
(setting
parameter)
LocSta.CtlV
al
(command)
Possible
locations that
shall be able
to operate
0 = Off 0 - - - Not possible
to operate
1 = Local 1 Priority - - Local Panel
1 = Local 5 No priority - - Local or
Remote level
without any
priority
2 = Remote 6 Priority No TRUE Station level
2 = Remote 7 Priority No FALSE Remote level
2 = Remote 2 Priority Yes - Station or
Remote level
2 = Remote 5 No priority - - Local,
Station or
Remote level
without any
priority
3 = Faulty 3 - - - Not possible
to operate
Section 14 1MRK 502 066-UUS B
Control
832
Technical manual
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