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Chapter 4. System Operation
4.1.2 Redundancy
Genius Hot Standby and Duplex Redundancy
Genius supports a number of different forms of redundancy, as described in the Genius I/O
System and Communications User's Manual - GEK-90486-1. Only Genius Hot Standby and
Duplex type redundancy (see GEK-90486-1 Chapter 8) is supported by the Genius Gateway
(GCG001).
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To support either Genius Hot Standby or Duplex type redundancy, two GCG001 modules are
present on the same physical Genius Bus, one at SBA #31 and the other at SBA #30, as shown
in Figure 19. This architecture is designed to withstand the loss of one GCG001 and the loss of
the PLC to which it is attached. The two GCG001 modules involved should therefore be
powered via independent 24Vdc power supplies. Alternately, a Genius Bus Controller may be
used at SBA #30 or #31.
In Genius Hot Standby, the I/O Blocks (both Analog and Digital) report all inputs to both
SBA#30 and #31, but use output data from SBA#30 only whenever SBA#31 becomes
unavailable. I/O controlled by the GR7 and GNIU also behave in this way.
In Genius Duplex Redundancy, Discrete Output Blocks vote on the output data received from
both SBA #30 and #31. A configuration parameter "Duplex Default State" must be configured
for each output point. This parameter determines how the output will behave in the event the
commanded output states received from SBA#30 and SBA#31 disagree. See GEK-90486-1
Chapter 8 for details. Whenever one of the controlling devices at SBA#30 or SBA#31 becomes
unavailable, the output will be controlled by the remaining device. Discrete outputs in the I/O
controlled by the GR7 and GNIU also behave in this way.
Note that the GCG001 does not support Genius Dual Bus Redundancy.
34 Public
PACSystems RX3i Genius Communications Gateway User Manual
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Figure 19: Genius Hot Standby Redundancy
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