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EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
109 74-2958—1
Appendix D. Q7750A Excel 10 Zone Manager
Point Estimating Guide.
Memor
y
size approximation is shown below:
(
all sizes in
b
y
tes
)
When
memory size
is less than 110,000 b
y
tes, the size is OK.
When
memory size
is between 110,000 and 128,000 b
y
tes,
the application ma
y
be too lar
g
e. The user must expect to
reduce the application complexit
y
, reduce the number of
attached Excel 10s or distribute the Excel 10s over more than
one Zone Mana
g
er.
When
memory size
is
g
reater than 128,000, the size is too
lar
g
e. The application size must be reduced as described
above.
Approximate Memory Size Estimating Procedure.
1.
Determine the number of points per controller re
q
uired
at the Central
(
for example, XBS
)
.
NOTE: All remainin
g
points that are not mapped can
be accessed throu
g
h the
Direct Access
feature.
2.
Calculate the number of Excel 10 Zone Mana
g
er pro-
g
ram points that are used in control lo
g
ic and in the
switchin
g
table.
3.
Estimate the pro
g
ram complexit
y
of the Zone Mana
g
er
(
one of three levels
)
.
a. No time pro
g
rams, control lo
g
ic, or switchin
g
tables.
b. 10K of control lo
g
ic
(
one time pro
g
ram, five
switchin
g
tables, and five control loops
)
.
c. 20K of control lo
g
ic
(
multiple time pro
g
rams, ten
switchin
g
tables, and ten control loops
)
.
Use Fi
g
. 51 to determine the number of Excel 10s that
can be connected to the Zone Mana
g
er.
NOTE: More than 60 Excel 10s re
q
uires a Router.
4.
Repeat for each Q7750A Excel 10 Zone Mana
g
er in a
pro
j
ect.
Fig. 51. Point capacity estimate for Zone Manager.
The exact e
q
uation for calculatin
g
memor
y
size follows:
Memor
y
size = 21,780
+ 4096
(
in case of a time pro
g
ram
)
.
+ CARE Control Pro
g
ram.
+ 14 x time points x Excel 10 units.
+ 50 x Excel 10 units.
+ map complexit
y
x Excel 10 units x mapped points.
+ 57 x C-Bus points.
+ 7488 x Excel 10 t
y
pes.
Where:
Time points = number of switch points in time pro
g
ram
per Excel 10.
Excel 10 units =number of attached Excel 10s.
C-Bus points = includin
g
mapped points and others; for
example, remote points.
Mapped points = number of mapped points per Excel 10,
includin
g
One-to-Man
y
and
Man
y
-to-One mechanism.
Excel 10 t
y
pes = number of different Excel 10 t
y
pes
(
currentl
y
three
)
Map complexit
y
=
20 =usin
g
One-to-Man
y
and not usin
g
points
with read/write.
30 = avera
g
e.
45 = man
y
points with read/write abilit
y
.
20 60 120
600
700
800
900
600
700
800
900
920
765
610
585
740
895
NUMBER OF
C-BUS POINTS
(EXCEL 10
MAPPED
POINTS
PLUS ZONE
MANAGER
POINTS)
(OR LESS) (ADD ROUTER)
NUMBER OF EXCEL 10s
(C)
(A)
NUMBER OF
C-BUS POINTS
(EXCEL 10
MAPPED
POINTS
PLUS ZONE
MANAGER
POINTS)
NO TIME PROGRAM,
NO CONTROL LOOPS,
NO SWITCHING TABLES.
20K CONTROL PROGRAM
(I.E., MULTIPLE TIME PROGRAMS,
10 CONTROL LOOPS,
10 SWITCHING TABLES.)
10K CONTROL PROGRAM
(FOR EXAMPLE,
1 TIME PROGRAM,
5 CONTROL LOOPS,
5 SWITCHING TABLES.)
(B)
M8729