ABB Relion Technical Manual page 384

Section 12
Control
378
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)
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 234. In addition, there is one setting parameter that affects 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 switch that is, 0. In this case it is not
possible to control anything.
Table 234: PSTO values for different Local panel switch positions
Local panel switch PSTO value
positions
0 = Off 0
1 = Local 1
1 = Local 5
2 = Remote 2
2 = Remote 5
3 = Faulty 3
Blockings
The blocking states for position indications and commands are intended to provide the
possibility for the user to make common blockings for the functions configured within a
complete bay.
The blocking facilities provided by the bay control function are the following:
• Blocking of position indications, BL_UPD. This input will block all inputs related to
apparatus positions for all configured functions within the bay.
• Blocking of commands, BL_CMD. This input will block all commands for all
configured functions within the bay.
• Blocking of function, BLOCK, signal from DO (Data Object) Behavior (IEC 61850–
8–1). 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.
AllPSTOValid Possible locations that shall be able to
(setting parameter) operate
-- Not possible to operate
Priority Local Panel
No priority Local or Remote level without any
priority
Priority Remote level
No priority Local or Remote level without any
priority
-- Not possible to operate
1MRK 502 048-UUS A
Technical manual