Network, Insulators, Network -8 insulators -8 – Rockwell Automation 1797-Series ControlNet Ex Media Plannng Installation Manual User Manual
Page 16
Publication CNET-IN003A-EN-P - January 2006
1-8 Overview of the ControlNet Ex Media System
hubs and cable length total are limited depending on your network
topology. You can have a maximum of 5 repeaters in series.
When you insert a fiber repeater hub into your cable system, you
create a new segment. The same restrictions on the number of taps
and cable length apply to this new segment.
Network
A ControlNet network is the collection of connected segments, fiber
repeater hubs, and nodes.
Insulators
The ControlNet Ex media system must maintain isolation from ground.
Many of the connectors have metal parts. These parts must be
insulated from ground contact by 500V insulation material. Insulators
are provided with ControlNet Ex media system components that
require insulation. For example, the ControlNet Ex taps are supplied
with an insulator kit.
A large variety of BNC connectors are available for use with the
ControlNet Ex media system. As a result, insulators for all types of
connectors are not available. In these cases, wrapping the exposed
metal with 500V insulation electrical tape is acceptable.
41327
Coax Segment
Coax Segment
Safe Area
Hazardous Area
Fiber Segment
N
N
N
N
N
N
T
T
T
T
T
T
T
T
Trunk Cable
H
H
Coax (1786) Fiber Hubs
Ex (1797) Fiber Hubs
ATTENTION
Use only the intrinsically-safe 1797 version of the
fiber repeater hub in the hazardous area.