Chapter 3. Configuration
GFK-2892F
March 2019
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Genius Hot-Standby Redundancy Configuration
As shown in Figure 22 below, a Hot Standby system will contain two GCG001 modules. One uses SBA #31, the
other uses SBA#30. Set the SBA as described in step 8 above. Do not select any SBA other than #30 and #31 for
GCG001 in Hot Standby.
Next, be sure to configure each device on the Genius Bus (i.e. those at SBA #1-29) with the parameter that
corresponds to Hot Standby. Use the Genius Hand-Held Monitor (HHM) to set this parameter.
1. To change the current selection, press F2 (tgl).
2. Press F3 (entr) to save the new selection.
3. Press F4 (next) to advance to the next
configuration display.
Blocks can be configured for No CPU Redundancy, Hot Standby or Duplex redundancy. For new blocks, it is set
to No Redundancy. It must be changed if the block should be able to receive output data from two CPUs.
In Hot Standby mode, a block receives output data from both CPUs but uses the data from only one of them to
drive its outputs. The block prefers outputs sent by the GCG with SBA#31. If those outputs are not available,
the block uses outputs from the GCG with SBA#30. If no outputs from either GCG are available, outputs either
Hold Last State or default (as configured).
