Rockwell-automation Ethernet Design Considerations Reference Manual Uživatelský manuál stáhnout pdf (Strana 24)

24 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 2 Ethernet Infrastructure Components

Media

The actual wire used for the network is referred to as the physical media.

Generally, shorter cable runs are less susceptible to EMI (electromagnetic

interference) and RFI (radio-frequency interference) from electrical circuits,

motors, and other machinery.

Figure 1 - Select Ethernet Media

For more information about the media options, see the Ethernet section of the

Network Media Catalog, publication M116-CA552

Do you have any of these:

• Long distances?

• High Magnetic fields?

• High noise?

Fiber Media

Recommendations:

• Multi-mode for general purposes, cost less

• Single-node yields higher distance, but

costs more

Do you have excess

amounts of any of these:

• Radiated noise?

• Conducted noise?

• Metal conduit?

Copper STP (shielded twisted pair)

Recommendations:

• Requires proper grounding

• Category 5e, 6, and 6a cables and

connectors

Copper UTP (unshielded twisted pair)

Recommendations:

• Requires proper grounding

• Category 5e, 6, and 6a cables and comectors

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Rockwell-automation Ethernet Design Considerations Reference Manual Uživatelský manuál Strana 24