User guide

14 MDX-ETHERNET User Guide

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5 Getting started

This section is intended to provide a generic guide for setting up MDX-ETHERNET and

a master controller. Figure 5-1 is intended as a guide only and is provided to detail the

stages that are required to achieve a functioning network. It is recommended that all of

this chapter is read, before attempting to configure a system.

Ensure the following information is available before calling :

• A list of all parameters in MDX-ETHERNET.

• The MDX-ETHERNET firmware version.

5.1 Network design considerations

Ethernet is an open system allowing many different vendors to design and supply

equipment. When designing an industrial network you must carefully consider the

topology and data traffic on the network to avoid potential problems.

To avoid bandwidth issues it is recommended that the control network is logically

separate from any other network. Where possible a physically separate network should

be used. If this is not possible, the use of managed network devices should be

considered to prevent unnecessary traffic such as broadcasts reaching the control

network.

5.2 Addressing

The addressing system used on Ethernet uses two essential numbers for making

connection, these are the IP address and the subnet mask. The address allows a

specific device to be located and the subnet mask defines how many bits represent the

subnet part of the address and how many bits represent the node address (see section

5.6.1 The IP address). Generally devices on different subnets can only communicate by

using a gateway (typically a router or firewall).

5.3 Where do IP addresses come from ?

Every address on a network must be unique. If you do not connect your network to any

other networks the assignment of IP addresses is not critical (although using a standard

system is recommended), as you have full control of the addresses used. The issue of

addressing becomes important when connecting multiple networks together or

connecting to the Internet where there is a strong possibility of duplication of addresses

if a scheme is not followed.

Due to the large number of PLCs/masters that support Modbus TCP only generic

details can be provided. Support is available through your supplier or LEROY-SOMER.

Before contacting your supplier or LEROY-SOMER for support ensure you have read

Chapter 12 Diagnostics of this manual and check you have configured all parameters

correctly.

NOTE

The MAC address may be found on the product label on the underside of MDX-

ETHERNET option.

NOTE