Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 279 / 706

7.11
Date Code 20070117
Instruction Manual SEL-351-5, -6, -7 Relay
Inputs, Outputs, Timers, and Other Control Logic
Remote Control Switches
If settings are changed for a setting group other than the active setting group,
there is no interruption of the remote bits (the relay is not momentarily
disabled).
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–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.
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) on page 10.38 .
See Appendix G: Setting SEL
OGIC
Control Equations for more details on
using the rising- and falling-edge operators in SEL
OGIC
control equations.