TM3 Ethernet Bus Coupler Presentation

Introduction

The TM3 Ethernet bus coupler is a device designed to manage EtherNet/IP and Modbus TCP communication when using expansion modules with a controller in a distributed architecture. The TM3 Ethernet bus coupler supports the TM3 expansion modules and the TM2 expansion modules.

Ethernet Services

The TM3 Ethernet bus coupler supports the following services:

oIPV4

oIPV6

oEtherNet/IP Adapter

oModbus TCP/IP server

oWeb server

oRing topology

oSNMP

oDPWS

Ethernet Protocols

The TM3 Ethernet bus coupler supports the following:

oIP (Internet Protocol)

oUDP (User Datagram Protocol)

oTCP (Transmission Control Protocol)

oARP (Address Resolution Protocol)

oRSTP (Rapid Spanning Tree Protocol)

Connections

This table shows the maximum number of connections:

Each connection based on TCP manages its own set of connections as follows:

1.When a client tries to open a TCP connection that exceeds the poll size, the TM3 Ethernet bus coupler closes the oldest connection. For Class 1 and Class 3 connections, when a client tries to open a connection that exceeds the poll size, the TM3 Ethernet bus coupler denies the new connection with the message: no resource available.

2.If all connections are busy (exchange in progress) when a client tries to open a new one, the new connection is denied.

Connections can be closed when the originator of the connection requests to close the connection it had previously opened.