Planning
LION System
EN1Z-0921GE51 R0315
12
L
ON
W
ORKS
Bus Cables
Cable type
Max. bus length
Belden 85102 (plenum)
2700 m (8900 ft)
Belden 8471 (non-plenum)
2700 m (8900 ft)
Level IV, 22 AWG
1400 m (4600 ft)
JY (St) Y 2 x 2 x 0.8
900 m (3000 ft)
TIA568A Cat. 5 24AWG, twisted pair
900 m (3000 ft)
Table 18 Doubly-terminated bus specifications
NOTE:
The above-listed cable types are as
recommended by Echelon in their FTT-10A User
Guide.
NOTE:
CentraLine 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.
Cable type
Max. node-to-
node distance
Max. total wire
length
Belden 85102
500 m (1650 ft)
500 m (1650 ft)
Belden 8471
400 m (1300 ft)
500 m (1650 ft)
Level IV, 22AWG
400 m (1300 ft)
500 m (1650 ft)
JY (St) Y 2 x 2 x 0.8 320 m (1050 ft)
500 m (1650 ft)
TIA568A Cat. 5
24AWG, twisted pair
250 m (825 ft)
450 m (1500 ft)
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
ON
W
ORKS
network segment.
NOTE:
In the event that the limit on the total wire length
is exceeded, the FTT physical layer repeaters
(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.
Field Device Cables
Type of signal
Cross-sectional area
100 m (300 ft)
(Fig. 39 on p. 28)
one transformer
400 m (1300 ft)
(Fig. 40 on p. 28)
separate
transformers
24 VAC power
1.5 mm
2
(16 AWG)
not allowed for
> 100 m (300 ft)
0…10 V signals
0.081 – 2.08 mm
2
(28 – 14 AWG)
Table 20 Cable sizing for connection of field devices
For wiring field devices see page 28.
