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device
100 m
termination
(328 ft.)
module
CPU
termination
100 m
(328 ft.)
100 m (328 ft.)
device
100 m (328 ft.)
device
ALLOWED:
node-to-node = 200 m (656 ft.)
node-to-node = 400 m (1312 ft.)
total wire length = 400 m (1312 ft.)
total wire length = 500 m (1640 ft.)
Fig. 32. Example of allowed/not-allowed free topology
layouts (max. node-to-node distance: 320 m, max. wire
length: 500 m)
NOTE: In the event that the limit on the total wire length is
exceeded, then FTT physical layer repeaters
(FTT 10A) can be added to interconnect segments
and increase 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 2x2x0.8 cable increases the maximum
length 3000 ft (900m) for each repeater.
L
W
Bus Termination Modules
ON
ORKS
Depending upon the configuration, either one or two
termination modules are required for terminating a
L
W
bus with FTT devices on it. The following two
ON
ORKS
different L
W
termination units are available for this
ON
ORKS
purpose:
•
209541B L
W
ON
ORKS
33 and Fig. 34) and
•
XAL-Term L
W
ON
ORKS
module (see Fig. 35), which can be mounted on DIN rails
and in fuse boxes.
Fig. 33. Termination Module 209541B connections for
doubly-terminated FTT network
Fig. 34. Termination Module 209541B connections for a
singly-terminated FTT network
device
device
(656 ft.)
100 m
device
(328 ft.)
termination
200 m
module
(656 ft.)
module
200 m
(656 ft.)
device
device
NOT ALLOWED:
NOT ALLOWED:
node-to-node = 200 m (656 ft.)
total wire length = 600 m (1968 ft.)
Bus Termination Module (see Fig.
connection and termination
200 m
device
100 m
(328 ft.)
device
100 m
(328 ft.)
device
removable screw-type
3-pole terminal block
In the case of either a daisy chain or free-topology
L
W
ON
ORKS
above must be adhered to.
23
4
3
L
L
O
O
N
N
Fig. 35. XAL-Term
bus layout, the maximum lengths described
DISTRIBUTED I/O
3
4
1
5
shield
shield
0
6
LON
plug-in
Termination
jumper
FTT/LPT Bus
FTT/LPT Free
Park Position
EN0B-0090GE51 R0802
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