90 Rockwell Automation Publication CNET-UM001F-EN-P - February 2018
Follow these guidelines to determine whether to cache a connection.
Repeated Cache the connection.
This keeps the connection open and optimizes message completion time.
Opening a connection during the execution of each message increases
execution time.
Infrequent Do not cache the connection.
This closes the connection upon completion of the message, freeing up that
connection for other uses.
To send or receive data from a ControlNet module via a message, you must
program a MSG instruction in the local controller’s logic. If the target
module is configured in the I/O Configuration folder of the controller,
browse to choose the module or manually type the message path in the MSG
instruction.
Browse to choose the target device of a MSG instruction and add that remote
device to the I/O configuration folder of the local controller. Within the I/O
configuration folder, organize the local and remote devices into a hierarchy
of tree/branch and parent/child.
Figure 13 - I/O Configuration Order for MSG Instruction
Item Description
Local controller and communication module
Remote controller and communication modules
Local communication module for the local controller
Message Connections
Logic
Modules and Remote
Devices to the Local
Controller’s I/O
Configuration
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