Indicates whether redundant units may communicate
synchronization messages with each other. If communication is
not permitted, this object is set to true. If communication is
permitted, this object is set to false.
In split mode (true), the active unit will not communicate
with the standby unit. The standby unit progression will not
occur. When split mode is disabled (false), the standby unit
is reset to recover.
Split mode (true) is useful for maintenance operations.