Momentum Modbus Plus 170 PNT Series Guia do Utilizador descarregar pdf (Página 151)

Using the Ethernet Port

870USE10110 July 2004 151

Network Design Considerations for M1 Ethernet Processors

Introduction In a distributed control environment, Ethernet can be used as:

an I/O network

a supervisory network

a network that combines I/O and supervisory functions

This section discusses how to design your network to make communication between

related devices as effective and deterministic as possible.

When installed on a new network, the M1 Ethernet processor will obtain the MAC

and IP addresses of other devices on the network. This process may require several

minutes.

When the module is successfully communicating with these devices, if a ring

adapter with battery back up is not present, it is recommended that you stop the

processor and save the user program to Flash. This will save the processor’s ARP

cache and enable it to remember this information if power is lost or removed. If you

do not save to flash, the processor must repeat acquiring the ARP cache information

from the network.

This procedure should also be followed whenever:

a new or substitute device is installed on the network

the IP address of a network device has been changed

Note: Preserve your ARP cache information.

CONTROL NETWORKS MUST BE ISOLATED FROM MIS DATA NETWORKS

To maintain a deterministic Ethernet network, you must isolate Momentum

processor adapters and related devices from MIS data networks. Traffic from MIS

data networks can interrupt communication between control devices, causing your

control application to behave unpredictably.

Additionally, the high message rates that may be generated between M1

processors and I/O adapters may bog down an MIS network, causing loss of

productivity.

Failure to follow this instruction can result in injury or equipment damage.

CAUTION

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Momentum Modbus Plus 170 PNT Series Guia do Utilizador Página 151