GE GFK0579B user manual Redundant Bus Configuations

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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.

HA 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.

RACK 0

PS S C A N N E R

RACK 0 a44974

PS S C A N

N

E

R

BUS A

BUS B

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.

RACK 0

PS S C A N N E R

RACK 0 a44878

PS S C A N

N

E

R

BUS A

BUS B

BUS

STUB

Î

UP TO 7 ADDITIONAL DEVICES

16 Series 90±70 Remote I/O Scanner User's Manual ± July 1992