Rockwell-automation Ethernet Design Considerations Reference Manual Uživatelský manuál stáhnout pdf (Strana 38)

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

Chapter 3 Ethernet Infrastructure Features

Network Address Translation

Network address translation (NAT) enables a single device to act as an agent

between the public network (commonly the plant network) and the private

network (machine network). This facilitates communication between a group of

computers with preset IP addresses on a private network by mapping each preset

IP address to a valid IP address on the public network.

These are two types of NAT implementations:

• One-to-many—Multiple nodes are mapped to a single public identity to

get onto the Internet, such as in a home network. This type of

implementation conserves public IP addresses and offers some protection

against attacks from the Internet.

• One-to-one—Each node on the network translates to another identity on

another network. This type of implementation is used in manufacturing to

integrate machinery onto a larger network without requiring addressing

changes at the machine level.

Allen-Bradley Products That Support NAT

The table summarizes features of the two products that support one-to-one NAT.

Feature 9300-ENA Device Stratix 5700 Switch

NAT architecture Standalone device Integrated into switch hardware

Performance 500 messages/s Wire-speed translations

Number of translations, max 128 128 devices or subnets

(1)

(1) One subnet translation can include translations for 16…65,000 devices.

Supported network topologies Star • Star

• Redundant star

• Ring

Configuration Web interface • Device Manager Web interface

• Studio 5000 environment

• Command-line interface (CLI)

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Rockwell-automation Ethernet Design Considerations Reference Manual Uživatelský manuál Strana 38