Biamp A4 - Manual (Page 22)

Audia-Manual-A4
Group Logic Outputs is used when Enable logic outputs is checked to determine what
complement of logic outputs are provided on the AudiaFUSION block. If Group logic outputs is
unchecked, the block will feature six logic outputs per channel, plus a global Fan Stuck Rotor
output. The six logic outputs for each channel correspond to the six fault types that an
AudiaFUSION amplifier channel can report: Heat Sink, Short Circuit, Channel Failure, Excessive
Clipping, Low Impedance, and High Impedance.
If Group Logic Outputs is checked, only two logic outputs are provided per amplifier channel,
Alarm and Warning, plus the global Fan Stuck Rotor. In this mode, the Alarm output is a logical
OR of the Heat Sink, Short Circuit, and Channel Failure Alarms. The Warning output is a logical
OR of the Heat Sink, Excessive Clipping, Low Impedance, and High Impedance Warnings. If an
AudiaFUSION block is initialized with Device Failover active, two additional global logic outputs
are provided, Primary Device Good and Secondary Device Good.
Amplifier Mode is used to specify whether the amplifier channels controlled by that block will be
configured as Low Impedance – for standard 4, 6, or 8 Ohm loudspeakers – or 70V or 100V
Constant Voltage – for connection to distributed, transformer-coupled loudspeakers.
Enable Device Failover is used to establish an automatic device failover mode using two
identically configured AudiaFUSION units. The two units become a logical pair and are referred
to as the Primary Device and Secondary Device. If the Primary Device experiences an alarm, it
will automatically transfer control to the Secondary Device, which will continue to process and
distribute audio, taking on all of the functions of the Primary Device.
When device failover occurs, switching relays on the AM600 amplifier modules will physically
break loudspeaker connections on the Primary Device and make connections on the Secondary
Device. As a result, it is necessary to have two physical cable runs to each loudspeaker
connection, one from the Primary Device and one from the corresponding output channel on the
Secondary Device, in order for audio to continue to flow when device failover occurs.
When an AudiaFUSION block is created with Enable Device Failover checked, it will appear in
the layout window as two devices “fused” together. The properties and attributes of the
Secondary Device cannot be edited or modified independently of the Primary Device. The two
units are always configured identically.
When a layout is compiled that includes an AudiaFUSION block with device failover enabled, the
Secondary Device will receive a device ID that is different from the Primary Device; however,
during a failover, any received ATP command strings intended for the Primary Device are
automatically routed to the Secondary Device, and any acknowledgement messages that the
Secondary Device returns will contain the device ID of the Primary Device, even though the
Primary Device is no longer the active unit. This preserves third-party control support during
device failover.
A device failover pair will appear in the Equipment Table with device types that are read-only. If
either the Primary or Secondary Device is removed from the Equipment Table, the partner unit
will also be removed.
Enable Channel Failover for these Channels provides a means of establishing an automatic
channel failover mode using two adjacent channels within a single AudiaFUSION unit. The two
designated channels become a logical pair and are referred to as Primary Channel and
Secondary Channel. If the Primary Channel experiences a channel alarm, it will automatically
transfer control to the Secondary Channel, which will continue to process and distribute audio,
taking on all of the functions of the Primary Channel.
When channel failover occurs, switching relays on the AM600 amplifier modules will physically
break loudspeaker connections on the Primary Channel and make connections on the Secondary
Channel. As a result, it is necessary to have two physical cable runs to each loudspeaker
connection, one from the Primary Channel and one from the Secondary Channel, in order for
audio to continue to flow when channel failover occurs.
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