Installation
and
Operation
Manual
12
ALU
One
ALU
can
support
one
addressable
loop
circuit,
which
supports
up
to
252
points
of
addressable
devices.
Initializes
and
operates
all
devices
residing
on
the
loop
and
communicates
all
relevant
devices
and
event
information,
such
as
alarms
and
troubles,
to
the
System
CPU.
Circuit
topology
support:
Class
A
or
Class
B.
ALU
address
is
set
by
the
rotary
switch
on
the
board.
The
valid
address
range
is
1~4.
Figure
8
ALU
The
ALU
must
be
set
to
a
correct
address
before
use.
Please
refer
to
Unit
Address
Setting
section
for
detail.