Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 51)

3Ć13
Chemical
and Thermal
Isolation
The network coaxial cable system must be protected from
damage caused by the following factors:
D Oil, grease, acids, caustics, and other harsh and/or
hazardous chemicals that might damage the cable outer
jacket and connectors, adapters, and terminating loads.
D Water, steam, and other liquids that could corrode
connectors, adapters, and terminating loads.
D Open flame, steam lines, and any equipment with the
temperature higher than the cable operating temperature.
Physical
Isolation
Use the following guidelines to prevent physical damage and
wear of the coaxial cable:
D Protect the cable from abrasion, vibration, moving parts, and
personnel traffic.
D Avoid intersecting a cable route with the regular routes of
cranes, forklifts, and similar equipment.
D Prevent the cable from contacting abrasive surfaces such as
concrete.
3.4 Designing a FiberĆOptic Cable Network
In a fiberĆoptic network, a StandĆAlone Transceiver is required at each
slave drop on the network. A StandĆAlone Transceiver is required at
the master rack only when this rack and the hub cannot be located
together in the same cabinet. The transceiver performs the optical
conversion of electrical data signals from the Network module to the
network and the electrical conversion of optical data signals from the
network to the Network module.
Each drop is connected by a fiberĆoptic link to another transceiver
mounted in a rack. Up to 10 transceivers can be mounted in the
transceiver rack, also called a hub." All communication between
drops takes place in the transceiver rack. The optical signals received
by any transceiver in the rack are converted into electrical signals
and propagated to all other transceivers in the rack via twistedĆpair
wire connections. Each transceiver then converts the electrical
signals to optical signals and retransmits them to its corresponding
drop.
Figure 3.6 shows how a larger network is created by linking hubs
together.