7-10
Inputs, Outputs, Timers, and Other Control Logic
Date Code 20011205
SEL-311A Instruction Manual
R
EMOTE
C
ONTROL
S
WITCHES
Remote control switches are operated via the serial communications port only (see
CON
Command (Control Remote Bit)
in
Section 10: Serial Port Communications and Commands
).
Figure 7.9: Remote Control Switches Drive Remote Bits RB1 Through RB16
The outputs of the remote control switches in Figure 7.9 are Relay Word bits RB
n
(
n
= 1 to 16),
called remote bits. Use these remote bits in SEL
OGIC
control equations.
Any given remote control switch can be put in one of the following three positions:
ON (logical
1)
OFF (logical
0)
MOMENTARY (logical 1 for one processing interval)
Remote Bit Application Ideas
With SEL
OGIC
control equations, the remote bits can be used in applications similar to those that
local bits are used in (see preceding local control switch discussion).
Also, remote bits can be used much as optoisolated inputs are used in operating latch control
switches (see discussion following Figure 7.14). Pulse (momentarily operate) the remote bits for
this application.
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