Справочник Пользователя для Honeywell W7750A

EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER

109

74-2958—1

Memory size approximation is shown below: (all sizes in 
bytes)

When memory size is less than 110,000 bytes, the size is OK.

When memory size is between 110,000 and 128,000 bytes, 
the application may be too large. The user must expect to 
reduce the application complexity, reduce the number of 
attached Excel 10s or distribute the Excel 10s over more than 
one Zone Manager.

When memory size is greater than 128,000, the size is too 
large. The application size must be reduced as described 
above.

Determine the number of points per controller required 
at the Central (for example, XBS).

NOTE:

All remaining points that are not mapped can 
be accessed through the Direct Access 
feature.

Calculate the number of Excel 10 Zone Manager pro-
gram points that are used in control logic and in the 
switching table.

Estimate the program complexity of the Zone Manager 
(one of three levels).
a. No time programs, control logic, or switching tables.
b. 10K of control logic (one time program, five 

switching tables, and five control loops).

c. 20K of control logic (multiple time programs, ten 

switching tables, and ten control loops).

Use Fig. 51 to determine the number of Excel 10s that 

can be connected to the Zone Manager.

NOTE:

More than 60 Excel 10s requires a Router.

Repeat for each Q7750A Excel 10 Zone Manager in a 
project.

The exact equation for calculating memory size follows:

Memory size = 21,780

+ 4096 (in case of a time program).
+ CARE Control Program.
+ 14 x time points x Excel 10 units.
+ 50 x Excel 10 units.
+ map complexity x Excel 10 units x mapped points.
+ 57 x C-Bus points.
+ 7488 x Excel 10 types.

Where:

Time points

= number of switch points in time program 

per Excel 10.

Excel 10 units = number of attached Excel 10s.
C-Bus points

= including mapped points and others; for 

example, remote points.

Mapped points = number of mapped points per Excel 10, 

including One-to-Many and 
Many-to-One mechanism.

Excel 10 types = number of different Excel 10 types 

(currently three)

Map complexity=

20 =using One-to-Many and not using points

 with read/write.

30 = average.
45 = many points with read/write ability.

20

60

120

600

700

800

900

600

700

800

900

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