Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 135)

Publication 1747-RM623D-EN-P - June 2006
Application Examples E-57
In general, we recommend that you create connections for a
particular device in its own Scanlist, but under the other devices
in that Scanlist. Then, RSNetWorx for ControlNet software knows
enough about that connection to create the other matching
connection in the other device’s Scanlist.
For this example, we create a connection in the node 1 scanner’s
Scanlist to send/produce 50 words of data to the scanner at
node 2 by entering this connection under node 2 in the Scanlist
for node 1. RSNetWorx for ControlNet software automatically
creates a receive/consumer data connection for 50 words under
node 2 in the node 2 Scanlist. Everything in the Scanlist for node
1 is with respect to node 1. Therefore, if a connection to Send
Data To is configured under node 2 in the node 1 Scanlist, this
means that node 1 will send/produce data to node 2.
We do not recommended that you create connections, for
example, under node 1 in its own Scanlist. RSNetWorx for
ControlNet software will not know which node will consume the
data it produces and will therefore not be able to create the
other necessary connection. Making that connection is then
your responsibility.
In this example, we want the 1747-SCNR scanner at node 1 to
send/produce 50 words of data to the 1747-SCNR scanner at
node 2. The connection name must be Send Data To. The
number of words in this case is 50, but the valid range is
between 1 and 240 words. The first available output address is
M0:e.3, where e is the slot number of the 1747-SCNR scanner at
node 1.
For this example, the 1747-SCNR scanner at node 1 takes 50
words of data copied to its M0 file by the SLC processor and
sends/produces this data on the ControlNet network for the
1747-SCNR scanner at node 2 to receive/consume.
The SLC processor in the same chassis as the node 1 scanner
will then need to copy 50 words of data to M0:3.3. The SLC
processor in the same chassis as the node 2 scanner will need to
copy 50 words from M1:1.3.