Honeywell Excel 800 Installation And Commissioning Instructions page 12

Planning
L W Bus Cables
ON ORKS
Cable type
Belden 85102 (plenum)
Belden 8471 (non-plenum)
Level IV, 22 AWG
JY (St) Y 2 x 2 x 0.8
TIA568A Cat. 5 24AWG, twisted pair
Table 18 Doubly-terminated bus specifications
NOTE: The above-listed cable types are as
recommended by Echelon in their FTT-10A User
Guide.
NOTE: Honeywell recommends the use of level IV,
22 AWG, solid core, non-shielded cable.
NOTE: Belden part numbers are 9H2201504 (plenum)
and 9D220150 (non-plenum).
FTT Specification
The FTT specification includes two components that must
be met for proper system operation:
 The distance from each transceiver to all other
transceivers and to the termination must not exceed the
max. node-to-node distance.
 If multiple paths exist, the max. total wire length is the
total amount of wire used.
Max. node-to-
Cable type
node distance
Belden 85102 500 m (1650 ft)
Belden 8471 400 m (1300 ft)
Level IV, 22AWG 400 m (1300 ft)
JY (St) Y 2 x 2 x 0.8 320 m (1050 ft)
TIA568A Cat. 5
250 m (825 ft)
24AWG, twisted pair
Table 19 Free topology (singly-terminated) specifications
NOTICE
Unpredictable reflections on the bus due to step change
in line impedance characteristics!
Do not use different wire types or gauges on the same
►
L W network segment.
ON ORKS
NOTE: In the event that the limit on the total wire length
is exceeded, the FTT physical layer repeaters
EN1B-0375GE51 R0315
Max. bus length
2700 m (8900 ft)
2700 m (8900 ft)
1400 m (4600 ft)
Field Device Cables
900 m (3000 ft)
900 m (3000 ft)
Type of signal
24 VAC power
0...10 V signals
Table 20 Cable sizing for connection of field devices
For wiring field devices see page 28.
Max. total wire
length
500 m (1650 ft)
500 m (1650 ft)
500 m (1650 ft)
500 m (1650 ft)
450 m (1500 ft)
12
(FTT 10A) can be added to interconnect seg-
ments. This increases the overall length by an
amount equal to the original specification for that
cable type and bus type for each repeater used.
For example, adding repeaters for a doubly-
terminated bus using JY (St) Y 2 x 2 x 0.8 cable
increases the max. length by 900 m (3000 ft) for
each repeater.
Cross-sectional area
 100 m (300 ft)
(Fig. 39 on p. 28)
one transformer
2
1.5 mm
(16 AWG)
0.081 – 2.08 mm
Excel 800
 400 m (1300 ft)
(Fig. 40 on p. 28)
separate
transformers
not allowed for
> 100 m (300 ft)
2
(28 – 14 AWG)