7-6 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006
SEL-351 Instruction Manual
Details on the Remote Control Switch MOMENTARY Position
This subsection describes remote control switch 3, which is also called remote bit 3 (RB3). All of
the remote bits, RB1 - RB8, operate in the same way.
The CON 3 command and PRB 3 subcommand places 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.
If RB3 is initially at logical 0, pulsing it with the CON 3 command and PRB 3 subcommand will
change RB3 to a logical 1 for one processing interval, and then return it to a logical 0. In this
situation, the /RB3 (rising edge operator) will also assert for one processing interval, followed by
the \RB3 (falling edge operator) one processing interval later.
If RB3 is initially at logical 1 instead, pulsing it with the CON 3 command and PRB 3
subcommand will change RB3 to a logical 0. In this situation, the /RB3 (rising edge operator) will
not assert, but the \RB3 (falling edge operator) will assert for one processing interval.
See CON Command (Control Remote Bit) in Section 10: Serial Port Communications and
Commands.
See Appendix G: Setting SELogic Control Equations for more details on using the rising and
falling edge operators in SELOGIC Control Equations.
LOCAL CONTROL SWITCHES
The local control switch feature of this relay replaces traditional panel-mounted control switches.
Operate the eight (8) local control switches using the front-panel keyboard/display (see Section 11:
Front-Panel Interface).
Figure 7.5: Local Control Switches Drive Local Bits LB1 Through LB8
Courtesy of NationalSwitchgear.com
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