Chapter 9 Communication instructions
212 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Modbus/TCP message connections
Modbus/TCP client supports a maximum of 16 connections. The following table
describes Modbus/TCP connection behavior.
Scenario Results
Message request is enabled, and a connection to the target does not
exist. .
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.
Message execution is completed, and ConnClose is set to True. 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.
Message execution is completed, and ConnClose is set to False. The connection is not closed.
Connection is not associated with an active message, and remains idle
for the amount of time specified in ConnTimeOut parameter.
The connection is closed.
Controller transitions from an executing mode (Run, Remote Run,
Remote Test Single Scan and Remote Single Rung) to a non-executing
mode.
All active connections are forcibly closed.
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