Owner manual
MRB01X
S
October
200
5
–
Issue 4
7
Triguard
SC300E MRB01XS Remote Bus Extender Slave Module
Remote
chassis
address
selection
is
controlled
from
the
associated
remote
bus
extender
master
module
MRB04XM.
Refer
to
the
Remote
Bus
Extender
Master
Module
User
Manual
(Ref
008
-
5117)
for
details.
There
are
no
address
setting
links
or
switches
on
the
MRB01XS
itself.
The
chassis
address
setting
links
‘UNIT
ID
0 to
3’
at
the
rear
of
the
remote
chassis
backplane
are
not
used.
Links
fitted
in
these
positions
will
have
no
effect.
The
primary
function
of
the
MRB01XS
is
to
respond
to
remote
chassis
I/O
module
read/write
requests
received
via
the
fibre
optic
data
link.
The
presence
of
the
fibre
optic
data
link
precludes
the
use
of
a serial
communications
module
in
a remote
chassis.
All
other
types
of
I/O
module
are
supported.
The
module
provides
identical
timing
for
remote
chassis
I/O
operations
as
the
MPP
provides
for
main
chassis
I/O
operations.
Although
the
MRB01XS
is
part
of
a triplicated
system,
the
module
itself
is
simplex
in
operation.
Redundancy
derives
from
the
fact
that
there
are
three
such
modules
in
each
remote
chassis.
The
MRB01XS
supports
both
single
and
dual
slot
hot
repair.
Figure
2
-
4 shows
the
main
functional
areas
of
the
MRB01XS
circuit.
Buffers
regulate
the
two
-
way
flow
of
data
and
control
signals
t
hrough
the
module,
under
the
overall
control
of
the
control
logic.
Power supplies
A pair
of
auctioneering
diodes
combines
the
two
5.4Vdc
power
supplies
from
the
chassis
-
mounted
PSUs
into
a single
5Vdc
(nominal)
supply
for
the
module.
Capacitive
decoupling
and
overcurrent
protection
is
provided.