8.4
SEL-734 Meter Instruction Manual Date Code 20090730
Logic
Remote Control Switches
Remote Control Switches
The outputs of the remote control switches in Figure 8.3 are Meter Word bits
RBn (n = 01 to 16), called remote bits. Use these remote bits in SEL
OGIC
control equations (see CON Command (Control Remote Bit) on page 10.29).
Figure 8.3 Remote Control Switches Drive Remote Bits RB01 Through RB16
Any given remote control switch can be put in one of the following three
positions:
Remote Bit States
Not Retained When
Power Is Lost
The states of the remote bits (Meter Word bits RB01 through RB16) are not
retained if meter power is cycled. The remote control switches always come
back in the OFF position (corresponding remote bit is deasserted to logical 0)
when power is restored to the meter.
Remote Bit States
Retained When
Settings Changed
The state of each remote bit (Meter Word bits RB01 through RB16) is retained
if meter settings are changed.
If a remote control switch is in the ON position (corresponding remote bit is
asserted to logical 1) before a setting change, it comes back in the ON position
(corresponding remote bit is still asserted to logical 1) after the change. If a
remote control switch is in the OFF position (corresponding remote bit is
deasserted to logical 0) before a settings change, it comes back in the OFF
position (corresponding remote bit is still deasserted to logical 0) after the
change.
Details on the
Remote Control
Switch MOMENTARY
Position
This subsection describes how to operate remote bit RB03 as a momentary
switch. You can make RB01–RB16, operate in the same way.
The CON 3 command and PRB 3 subcommand place the remote control
switch 3 into the MOMENTARY position for one processing interval,
regardless of its initial state. Remote control switch 3 is then placed in the
OFF position.
ON (logical 1)
OFF (logical 0)
MOMENTARY (logical 1 for one processing interval – 25 ms)
Logical 1
OFF position
(maintained
logical 0 position)
ON position
(maintained logical 1 position)
MOMENTARY position
(logical 1 for one processing interval)
RBn (n = 01 through 16)
Meter
Word
Bit
The switch representation in this figure is derived from the standard:
Graphic Symbols for Electrical and Electronics Diagrams
IEEE Standard 315-1975, CSA Z99-1975, ANSI Y32.2-1975
4.11 Combination Locking and Nonlocking Switch, Item 4.11.1
Courtesy of NationalSwitchgear.com
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