Sel 421 - Table 5.8 Local Bit Control Settings; Table 5.9 Local Bit SEL OGIC

U.5.26
SEL-421 Relay User’s Guide Date Code 20090715
Front-Panel Operations
Front-Panel Menus and Screens
To enable a local bit, enter the local bit settings in Table 5 .8 (n = 1–32). The
format for entering the local bit data is the comma-delimited string:
local bit,control function name,alias for the set state,alias for the clear
state,pulse enable
Names or aliases can contain any printable ASCII character except double
quotation marks. Use double quotation marks to enclose the name or alias. See
Example 5.4 for particular information on enabling a local control bit.
The pulse state enable setting at the end of the setting string is optional. If
your application requires a pulsed or momentary output, you can activate an
output pulse by setting the option at the end of the local bit command string to
Y (for Yes). The default for the pulse state is N (for No); if you do not specify Y,
the local bit defaults at
N and gives a continuous set or clear switch level.
If you enter an invalid setting, the relay displays an error message prompting
you to correct your input. If you do not enter a valid local bit number, the relay
displays
A local bit element must be entered. If you enter a local bit
number and that local bit is already in use, the relay displays
The local bit
element is already in use
. Likewise, if you do not enter valid local bit
name, set alias, and clear alias, the relay returns an error message. If an alias is
too long, the relay displays
Too many characters.
Local Bit Supervision SEL
OGIC control equation provides supervision of
Local Bit Set, Clear, and Pulse operations
Local Bit Status Display SEL
OGIC control equation returns the status of the
local bit switch state.
Table 5.8 Local Bit Control Settings
a
a
n = 1—32
Description Range Default
Local Bit n 1–32 1
Local Bit n Name 20-character maximum ASCII string (blank)
Local Bit n Set Alias (1 state) 20-character maximum ASCII string (blank)
Local Bit n Clear Alias (0 state) 20-character maximum ASCII string (blank)
Pulse Local Bit n Y, N N
Tab l e 5 .9 L oc a l B it S E L OGIC
a
a
n = 1–32, only available if the corresponding local bit is defined.
Description Range Default
Local Bit Supervision n SELogic Equation, NA 1
Local Bit Status Display n SELogic Equation, NA LBn
Courtesy of NationalSwitchgear.com