Redundancy - Emerson PACSystems RX3i User Manual

User manual
GFK-2892G
7. Reconnect the GCG001 to the Genius bus.
8. Note that the HHM will not work reliably on a mixed baud rate bus. Connect the
4.1.2

Redundancy

Genius Hot Standby and Duplex Redundancy
Genius supports several different forms of redundancy, as described in the Genius I/O
System and Communications User's Manual, GEK-90486-1
Figure 27: 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 27. 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.
System Operation
HHM directly to any device under these circumstances and disconnect that device
from the Genius bus temporarily. The baud rate of the HHM can be altered (via the
HHM keyboard) to match the configured baud rate of the device (which may be
unknown). Once both the HHM and target device are set to the same baud rate, the
HHM can command the target device to change to a new baud rate, which will take
effect upon power cycling the device. Remember to then change the baud rate of
the HHM to the new baud rate.
Chapter 4
Sep 2019
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