If, in this case, line voltage supervision is added, then rather than setting 989 to open
state, specify the state of the voltage supervision:
• 989_OP = VOL
T_OFF
• 989_CL = VOLT_ON
If there is no voltage supervision, then set the corresponding inputs as follows:
• VOLT_OFF = 1
• VOLT_ON = 0
12.5 Logic rotating switch for function selection and LHMI
presentation SLGAPC
SEMOD114936-1 v4
12.5.1 Identification
SEMOD167845-2 v3
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Logic rotating switch for function
selection and LHMI presentation
SLGAPC - -
12.5.2 Application
SEMOD114927-4 v6
The logic rotating switch for function selection and LHMI presentation function
(SLGAPC) (or the selector switch function block, as it is also known) is used to get a
selector switch functionality similar with the one provided by a hardware multi-
position selector switch. Hardware selector switches are used extensively by utilities,
in order to have different functions operating on pre-set values. Hardware switches are
however sources for maintenance issues, lower system reliability and extended
purchase portfolio. The virtual selector switches eliminate all these problems.
SLGAPC function block has two operating inputs (UP and DOWN), one blocking
input (BLOCK) and one operator position input (PSTO).
SLGAPC can be activated both from the local HMI and from external sources
(switches), via the IED binary inputs. It also allows the operation from remote (like the
station computer). SWPOSN is an integer value output, giving the actual output
number. Since the number of positions of the switch can be established by settings (see
below), one must be careful in coordinating the settings with the configuration (if one
Section 12 1MRK 505 370-UUS A
Control
398 Busbar protection REB670 2.2 ANSI
Application manual
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