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17Chapter 1 Introduction
A Remote I/O Scanner can be located on a bus stub. The bus switching device to
which the bus stub is connected can be another Remote I/O Scanner, as shown
below, or a Genius block with a Bus Switching Module attached.
In this example, there are two remote drops installed directly on a dual bus. A
third remote drop and some Genius blocks are installed on a bus stub connected to
one of the Remote I/O Scanners. That Remote I/O Scanner acts as the bus
switching device. A remote drop on a bus stub can accommodate up to 128 bytes
of inputs and 128 bytes of outputs, and may include expansion racks.
a44880
BUS A
BUS B
BUS
STUB
P
S
A
S
C
N
N
E
R
RACK 0
P
S
A
S
C
N
N
E
R
P
S
A
S
C
N
N
E
R
RACK 0
RACK 0
Finally, a remote drop can be located on just one bus of a redundant bus pair, if
bus redundancy is not needed for the modules in that remote drop.
In this example, the remote drop on the right is connected to both Bus A and Bus
B; the remote drop on the left, which contains non–critical I/O modules, is
connected to Bus A only.
a44877
BUS A
BUS B
P
S
A
S
C
N
N
E
R
RACK 0
P
S
A
S
C
N
N
E
R
RACK 0