Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 233)

21Ć1
21.0 MAINTAINING THE
DCSĆNET NETWORK
21.1 Maintaining the Coaxial Cable DCSĆNET
Network
Refer to this section for information about adding or disconnecting a
network drop, maintaining the cable system design and
documenting and inspecting the cable system.
For information about: See this section:
Maintaining the Coaxial Cable DCSĆ
NET Network
21.1
Maintaining the FiberĆOptic DCSĆNET
Network
21.2
What to Do Next 21.3
21.1.1 Adding a Network Drop
Use the following procedure to add a drop to the coaxial cable network:
Step 1.
Identify the route for a new cable segment (or segments).
Refer to the recommendations provided in chapter 3. If a
new drop is to be added at the end of the network cable
system, only one new cable segment will be necessary.
Otherwise, two new cable segments will be necessary.
Step 2. Calculate the new cable segment length. Ensure that the
new total cable length does not exceed the maximum
cable length defined in the AutoMax network specification
(see Appendix C). If it exceeds the maximum specified
cable length, consult with Reliance Electric before taking
any further steps.
Step 3. Cut, install, terminate, and test the new cable segment
following the instructions provided in chapter 7.
Step 4. Stop all communications over the AutoMax network.
Step 5. Refer to figure 21.1 and use the following procedures if a
new drop is to be added to one of the ends of the
network. Skip to step 6 if a drop is to be added along the
cable route.
a) Disconnect the terminating load from the tap of the
existing drop and replace it with one end of the new
cable segment.
b) Connect the terminating load to a new tap. Connect
the other end of the new cable segment to this tap.
c) Attach the tap to the Network module using a drop
cable.