254
Interface for use in LONWORKS
®
<Rough Estimate of Number of Groups Connected >
(Assuming that acknowledged service is 20 items per
second on a 30-second interval data collection cycle.)
- Acknowledged Service (possible communication volume): 20 items/second
This is one of the performance features of a Interface for LONWORKS
®
. It can process 20 items per second.
- 30-second interval data collection cycle
This is the time interval whereby device data (status) is collected from the central monitoring panel.
In this case, the data regarding the connected A/C units is collected in 30 seconds. This figure differs with respect to
the specifications of the central monitoring panel.
- Interface for LONWORKS
®
performance...Acknowledged service: 20 items per second (fixed value)
- Central Monitoring Panel performance...Data collection cycle interval:
seconds
(30 seconds when not specified.)
Data is collected 20 items per second for seconds. Therefore, the total number of
control items is calculated in a following manner:
T = 20
×
= items
If the number of control items per group is
, the number of groups connectable is:
n = T
÷
(No. of control items per group) =
÷
= groups
<Maximum of 64 groups>
Control and Monitoring
Items
n (individual groups)
Max. number of groups
connected
Remarks
23 items (All) 26 groups
- One LON can monitor up to 600 items.
- The maximum number of control and monitoring
items is 23 per A/C unit. If the number of control
and monitoring items per A/C unit is assumed as
‘n’, the number of A/C groups connectable would
be:
<Note: The maximum No. of A/C groups is 64.>
20 items 30 groups
18 items 33 groups
16 items 37 groups
15 items 40 groups
12 items 50 groups
10 items 60 groups
9 items 64 groups
!! "
# " #
$ %
take caution so that the frequency of changing the setting of each indoor unit may not exceed 7000 times / year
!! # &
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