CENTRALINE I/O MODULES – INSTALLATION & COMMISSIONING INSTRUCTIONS
EN1Z-0973GE51 R0119
10
Panel Bus Cables
Table 17. Panel Bus cables specification
Max. length
40 m (any type of cabling and topo-
logy, incl. star and loop topology,
possible; no additional end termination
permitted); 1200 m (mandatory
twisted-pair or telephone cable and
daisy chain topology; controller must
be positioned at one end of the Panel
Bus, and an end termination of 120 Ω
positioned at the other end)
Cable type twisted pair, e.g., J-Y-Y 2 x 2 x 0.8
LONWORKS Bus Cables
Table 18. Doubly-terminated bus specifications
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)
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.
Table 19. Free topology (singly-terminated) specifications
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)
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
ONWORKS 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 segments.
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
Table 20. Cable sizing for connection of field devices
Type of signal
Cross-sectional area
100 m (300 ft)
(Fig. 26 on p. 20)
one transformer
400 m (1300 ft)
(Fig. 27 on p. 20)
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)
For wiring field devices see page 20.
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