Getting Familiar with ControlNet Hardware and Network Design Basics

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Getting Familiar with ControlNet Hardware and
Network Design Basics
NET711
Presenters Tique Crespo and Fred Rowe
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What is ControlNet?

• ControlNet is a robust, high performing,
  networking solution that guarantees I/O and
  messaging communication.
• Media is either 75 ohm RG-6 Quad Shield or Optic
  Fiber cable .
• robust design
• Rugged noise immune media that can be field
  terminated, also offered with redundant media
  options
• high performance
• 5M bits/sec, up to 99 nodes
• guaranteed data delivery
• Network schedule ensures critical data is
  delivered on time and is repeatable

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Why use ControlNet?

• ControlNet is tunable"
• - providing ultimate flexibility in controlling
  individual devices at different response rates

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Adding nodes has NO impact on other nodes.
Very Cool !
Adding nodes can be done with network in Run
mode.

• You can either
• Schedule your I/O to reserve bandwidth for
  control
• Use unscheduled for runtime modifications or
  additions of I/O.

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Ideal ControlNet Applications
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ControlNet Topology Options
RG-6 Quad with a Tap for each node.
2 RG-6 Quad Segments joined by 2 repeaters
with Fiber in between.
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Fiber Ring using 4 repeaters going out to Coax
Segments If one repeater fails the others
will remain communicating Redundancy Baby!
Star Using 8 repeaters which go out to 4 Coax
Segments.
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ControlNet Fiber Media
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Fiber uses 2 conduits one for Transmit and one
for Receive
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ControlNet Fiber Optic Media
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Reference Literature

• ControlNet Coax Media Panning Installation
  Guide Publication CNET-IN002A-EN-P December
  2001
•  
• ControlNet Modules in Logix5000 Control Systems
  Publication CNET-UM001C-EN-P
• November 2005

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ControlNet Coax Media

• RG-6 Quad Shield Coax Trunkline
• Cost effective / rugged cabling 1786-RG6 (AB) or
  Belden 3092A
• Convenient tools and termination 1786-CTK
• Provides noise immunity layout flexibility
• All Devices Require 1 Tap per Node
• Distances up to 300m without a repeater
• 75 Ohm Terminators required at both ends of the
  trunk network.

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Laying out your Coax C-Net Media

• Determine the number of devices that will be
• on the ControlNet network so you know how many
  taps you need.
• If you plan to add more devices later install the
  cable and connectors now to minimize the
  disruption to the network later. Use the
  1786-BNCJ Bullet jack in place of a tap until the
  node is actually added.
• Any unused tap connectors should have the
  1786-TCAP
• connected to serve as a dummy load and minimize
  noise to the network.

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Laying out your Coax C-Net Media

• Taps come in assorted configurations.
• Also (2) 1786-BNC connectors are included with
  each tap kit.

(2) connectors
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Laying out your Coax C-Net Media

• Maximum coax cable length is 3280 ft (1000m)
  based on 2 taps total being used.
• Maximum nodes or taps is 48 based on 820 ft
  (250m) maximum length allowed.
• Formula maximum allowable segment length
• 1000m (3280ft) - 16.3m (53.4ft)
  X number of taps - 2

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Based on PVC cable being used. FEP Plenum cable
follows different rules.
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When do you need a Repeater

• Changing over from Coax to Fiber.
• You have exceeded the 3280 ft or 1000m
• maximum cable length but your network needs
• to be longer.
• When you have reached the limit of tap to
• coax length and want to keep adding
• Taps to the network.

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Approved Connectors
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Making a BNC Connector

• Tools for the job 1786-CTK

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Making a BNC Connector

• Setting the Strip tool for the Coax cable type.

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Making a BNC Connector

• Stripping the cable

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As you rotate around cable increment the
stripper cam toward the stop.
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Making a BNC Connector

• Trim solid copper center to 4.0mm

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Making a BNC Connector

• Don forget to slip the ferrule over the coax.
• With Quad shield the first braid needs to be
  folded back exposing the first foil.
• Remove the foil and then fold back the second
  layer of braid.

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You may fold back the braid using the flare tool.
Be careful not harm the second layer of foil.
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Making a BNC Connector

• Trim the center copper conductor to 4 mm and then
  slip the center pin over the center conductor.

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Crimp the center pin using the crimp tool
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Making a BNC Connector

• Slip the connector base over the center pin and
  fold the braid back over the base.

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Making a BNC Connector
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• Slip the ferrule over the connector base and
  center the crimp tool onto the ferrule and crimp.

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Stripping detail of Ideal BNC Connector
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