Rockwell Automation 1794-OB16D FLEX I/O Diagnostic Modules User Manual - Manual (Page 47)

Publication 1794-UM061A-EN-P - July 2006
Configuring Modules for Communication on a Remote I/O Network 45
6. Configure the Communication Tab for the MSG Instruction.
A. Define the following communication fields:
• Path
• Module Address
• Cache Connections
B. Click OK.
Communication Parameters
Path Click on Browse to see a list of the I/O modules in the system. To be able to choose a path for your message
instruction using the Browse button, you had to previously configure the I/O module. If the module is not in the I/O
configuration tree then, you must manually type the path to the 1756-DHRIO module in this field (i.e., (1,1) where
the first 1 represents the backplane and the second 1 represents the slot of the 1756-DHRIO module).
Module Address These fields are filled in based on the module that you choose in the Path field.
Cache
Connections Checking this box means that the controller keeps the connection open after it completes the block transfer. The
next block transfer utilizes the connection and avoids the delay of having to establish connections. Keeping the
connection open can result in faster block transfers but be aware that the connection remains open indefinitely.
The controller has a limited amount of connections and keeping this connection open could result in the controller
not being able to establish connections with another device.
Clearing this box means that the connection will be uncached. An uncached connection is a connection between
two points that opens only when a message is enabled and closes when the controller completes the block
transfer. Uncached connections are not as fast as cached connections.
If you have this software and
firmware revision:
Then you can cache:
11.x or earlier block transfer messages for up to 16 connections
other types of messages for up to 16 connections
12.x or later up to 32 connections