2.3.1 Group Redundancy
The Group Redundancy monitors pre-communicating Riser board(s). Group Redundancy is
dependent upon the number of Riser boards connected within the group. For example, if only
one Riser board is connected, then only one Riser board is monitored for loss of
communication. If four Riser boards are connected, then all four Riser boards are monitored for
loss of communication.
If any communicating Riser boards loses communication for more than 10 seconds, a signal is
sent to trigger a set of relays to shut down the primary set of Riser boards and start the
redundant set.
If there are no Riser boards connected prior to power up, Group Redundancy will not monitor
any Riser boards.
The system has to have additional wiring for the Group Redundancy feature to operate.
• All I/Os between the primary and redundant Riser 1 boards needs to be wired in
parallel.
• All Hall board communication between the primary and redundant Riser 1 boards needs
to be wired in parallel.
• Additional wiring for the relays to control power to the primary and redundant Riser 1
boards.
2.4 24 Input Board SR3041
The 24 Input board serves the same purpose as the SR3031 I/O Expansion board with the
exception that there are NO outputs. The 24 Input board has three sets of 8 assigned inputs
which allows for the ability for this board to replace three SR3031 I/O boards. Just like the
SR3031 Expansion board, the 24 Input board can be daisy chained to either the SR3041 or
SR3031 board.
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