Communication instructions Chapter 9
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 211
Parameter Data type Description
MsgTimeOut UDINT Message timeout (in milliseconds). Amount of time to wait for a reply for an initiated command.
• 250-10,000
• Set to 0 to use the default value 3000.
• A value less than 250 (minimum) will be set to 250.
• A value greater than 10,000 (maximum) will be set to 10,000.
See also Modbus/TCP message timeout timers on page 211.
ConnTimeOut UDINT TCP Connection establishment timeout (in milliseconds). Amount of time to wait for establishing successful TCP connection to
the Target device.
• 250-10,000
• Set to 0 to use the default value 3000.
• A value less than 250 (minimum) will be set to 250.
• A value greater than 10,000 (maximum) will be set to 10,000.
See also Modbus/TCP message timeout timers on page 211.
ConnClose BOOL TCP connection closing behavior.
• True: Close the TCP connection upon message completion.
• False: Do not close the TCP connection upon message completion [Default].
See also Modbus/TCP message connections on page 211.
Modbus/TCP message timeout timers
The following table describes how timers for MODBUS2TARPARA timeout
parameters (UcmmTimeout and ConnMsgTimeout) behave based on message
requests and status.
Action Results
Message is enabled UcmmTimeout timer is activated
Connection is requested ConnMsgTimeout timer is activated
ConnMsgTimeout timer is active UcmmTimeout timer is disabled
Connection request is completed UcmmTimeout timer is reactivated
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