Genius Hot Standby Dual Bus Configuration - Emerson PACSystems RX3i User Manual

User manual
GFK-2892G
Figure 24:
1. To change the configuration, press F2 (tgl).
2. To save the new selection, press F3 (entr).
3. Press F4 (next) to advance to the next configuration display.
Figure 25:
1. To change the configuration, press F2 (tgl).
2. To save the new selection, press F3 (entr).
3. Press F4 (next) to advance to the next configuration display.
GCG001 offers an optional enhancement to Genius Dual Bus. It is PROFINET Media
Redundancy, shown in Figure 26. PROFINET Media Redundancy (MRP) offers a solution
where the PROFINET network is more likely to be compromised. Genius Dual Bus offers a
solution where the Genius Bus is more likely to be compromised.
3.2.5

Genius Hot Standby Dual Bus Configuration

Genius Hot Standby Dual Bus Configuration combines the two architectures discussed in
Section 3.2.2 and 3.2.4. The result is diagrammed in Figure 26. There is a total of four Genius
Bus Controllers involved, here shown as GCG001 units.
• The Primary CPU hosts two GCG001 units, each using SBA#31. One of these is resident
on Bus A; the other is resident on Bus B.
• The Secondary CPU hosts two GCG001 units, each using SBA#30. One of these is
resident on Bus A; the other is resident on Bus B.
• Each I/O drop connects to Genius Bus A and to Genius Bus B via a Bus Switching Module
(BSM). Some devices have built-in BSMs, while others, such as the Genius blocks,
employ an external BSM. In the event the active bus becomes disconnected, the BSM is
commanded by its host I/O device to switch to the alternate bus. In this way, the
application is protected against failure of either bus and/or a Bus Controller (here
GCG001).
• It is permitted to have non-redundant I/O devices (i.e. I/O connected to just one Genius
Bus – none are diagrammed below. Such devices would not employ a BSM.
Configuration
Chapter 3
Sep 2019
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