Honeywell EXCEL 5000 OPEN SYSTEM XFL521B Product Data page 23

Examples of free topology schemes (1 allowed, 2 not
allowed) for cable JY (St) Y 2x2x0.8 are shown below.
Device
Termination
module
328 ft
(100m)
Device
Device
ALLOWED
Node-to-node = 656 ft (200m)
Total wire length = 328 ft (400m)
Device
328 ft
(100m)
Termination
module
NOT ALLOWED
Node-to-node = 1287 ft (400m)
Total wire length = 1640 ft (500m)
Figure 32. Free topology examples (max. node-to-node
320 m, max. wire length 500m)
Device
Termination
module
Device
328 ft
(100m)
NOT ALLOWED
Node-to-node = 656 ft (200m)
Total wire length = 1969 ft (600m)
Figure 33. Additional free topology example (max. node-
to-node: 320 m, max. wire length: 500 m)
328 ft (100m)
CPU
328 ft (100m)
328 ft (100m)
Device
656 ft
(200m)
656 ft
(200m)
Device
Device
656 ft
(200m)
328 ft
(100m)
Device
Device
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
ON ORKS
One or two Termination Modules, part no. 209541B, are re-
quired for a L W
ON ORKS
pending upon the configuration. The maximum lengths des-
cribed in "L W Network Interface" must be adhered to
ON ORKS
for either a daisy chain or free topology L
layout. See Figure 34 and Figure 35 for connection details for
the 2095401B Termination Module.
Figure 34. Termination Module connections for doubly-
terminated FTT network.
Figure 35. Termination Module connections for a singly-
terminated FTT network.
23
DISTRIBUTED I/O
bus with FTT devices on it, de-
W
ON ORKS
bus
EN0B-0090