VAR8 and Variants - Product Description
Issue: 02 complete, approved
Page 25 of 54
Figure 8 ANS Operation
AMBIENT NOISE
LEVEL
Min
ANS=+70dBA
Max
ANS=+90dBA
ANNOUNCEMENT
IN PROGRESS
T
MAX CONTROL RANGE
(+20dB)
B
A A
AREA
AMBIENT NOISE BELOW MIN ANS THRESHOLD,
THEREFORE MINiMUM GAIN IS USED.
AREA
AMBIENT NOISE ABOVE MAX ANS THRESHOLD,
THEREFORE MAXIMUM GAIN IS USED.
A
B
PA
SYSTEM GAIN
0dB
-25dB
ANNOUNCEMENT
IN PROGRESS
(FROZEN ANS LEVEL)
MAX CONTROL RANGE
(+20dB)
T
-5dB
OUTPUT GAIN SETTING:
MAXIMUM GAIN (WITHOUT ANS) =-5 dB
ANS SETTINGS:
MIN ANS THRESHOLD = +70 dBA
MAX ANS THRESHOLD = +90 dBA
2.6.3.4 Digital Inputs
Each of the digital inputs may be independently assigned as a Contact for Routing Control, Routing Reset or
Remote Fault input. Operation is as described in Sections “2.6.1.2.1 Routing: Latching”, “2.6.1.2.2 Routing:
Non-Latching, Latent Routes”, and “2.6.1.2.3 External Faults”.
2.6.3.5 Digital Outputs
The digital output is an active-low open-collector output.
The digital outputs may be assigned as ‘Busy Outputs’. Each such output may be assigned to correspond to
the busy state of any Router output or group of outputs when being driven by any input or group of inputs. In
the case of a group of Router outputs, it operates as an OR function of the busy state of the Router outputs,
i.e. if any of them are busy with any of the selected inputs then the digital output is driven.
Once an output has been assigned to the ‘Busy’ function, its open and short circuit fault monitoring is
enabled. The Router will log a fault in the event of the output load becoming disconnected, or a short circuit
condition being detected at the output. The Router fault report identifies the specific Remote I/O Unit, and the
particular digital output channel number affected. It does not differentiate between open and short circuit
faults.
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