PACSystems VersaMax Genius Network Interface User Manual Section 6
GFK-1535D Jan 2023
Redundancy 110
6.2.1 Redundant Bus Configurations
Many different redundant bus configurations are possible. Three basic
ways of using an NIU with a redundant bus are described below.
•
An NIU can be installed directly on both cables of the dual bus
pair. The NIU is configured to operate as a bus-switching device in
addition to performing its normal functions. Here, two NIUs are
installed on a dual bus. Each NIU would be set up as a bus-switching
device.
Figure 68: Example NIU Installed Directly Installed on Both Cables
•
An NIU can be located on one bus of a redundant bus pair if bus
redundancy is not needed for the modules in that station. In this
example, the NIU on the left is connected to both Bus A and Bus B
and is configured as a bus-switching device. The NIU on the right,
which serves non-critical I/O modules, is connected to Bus A only and
is not configured as a bus-switching device.
Figure 69: Example of an NIU located on One Bus of a Redundant
Pair
To Next Page
Loading...
