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Series 90–70 Remote I/O Scanner User’s Manual – July 199216
Redundant Bus Configuations
Many different redundant bus configurations are possible. Three basic ways of using a
Remote I/O Scanner with a redundant bus are described below.
A Remote I/O Scanner can be installed directly on both cables of the dual bus
pair. The Remote I/O Scanner is configured to operate as a bus switching device in
addition to performing its normal remote drop functions.
Here, two single–rack remote drops are installed on a dual bus. The Remote I/O
Scanner in each remote drop would be set up as a bus switching device.
a44974
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
A bus stub may be connected to a Remote I/O Scanner that is configured as a bus
switching device, allowing up to seven additional devices to utilize its bus
switching action. Devices on a bus stub are independent Genius devices. When
bus switching is controlled by a Remote I/O Scanner, as shown below, the devices
on the bus stub are not part of the remote drop. Their data does not count toward
the remote drop’s data total.
BUS A
BUS B
BUS
STUB
P
S
A
S
C
N
N
E
R
P
S
A
S
C
N
N
E
R
a44878 RACK 0 RACK 0
UP TO 7 ADDITIONAL DEVICES