Allen-Bradley Micro800 General Instructions Manual page 212

Programmable controllers

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Table of Contents

Communication instructions

Message request is enabled, and a connection to the target does not

Message execution is completed, and ConnClose is set to True.

Message execution is completed, and ConnClose is set to False.

Connection is not associated with an active message, and remains idle

for the amount of time specified in ConnTimeOut parameter.

Controller transitions from an executing mode (Run, Remote Run,

Remote Test Single Scan and Remote Single Rung) to a non-executing

Modbus/TCP message connections

Modbus/TCP client supports a maximum of 16 connections. The following table

describes Modbus/TCP connection behavior.

Rockwell Automation Publication 2080-RM001D-EN-E - February 2015

If a connection to the target does not exist, a new connection is established.

If a connection to the target already exists, the existing connection is used.

If there is only one connection to the target, the connection is closed.

If there is more than one connection to the target, the connection is closed when

the last message execution is completed.

The connection is not closed.

The connection is closed.

All active connections are forcibly closed.