Redundancy; Figure 22: Genius Hot Standby Redundancy - GE GFK-2892F User Manual

Chapter 4. System Operation

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

Figure 22: Genius Hot Standby Redundancy

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 Figure 22. This architecture is
designed to withstand the loss of one GCG001 and/or 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, GBIU,
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. Refer to Genius I/O System and Communications User's Manual, 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.
The GCG001 can be used to achieve Genius Dual Bus Redundancy when used in conjunction with application
code provided by GE Automation & Controls. Please contact Customer Support for assistance.
38 PACSystems RX3i Genius Communications Gateway GFK-2892F