Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 183)

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Document: 553633
ICSTT-RM405f-EN-P
Issue 07
8-13
 If the produce tags are all unicast, 40 connections will be used in the controller (20
x 2), and 40 connections will be used in the ENBT. No multicast addresses will be
used by the ENBT since unicast does not require a multicast address.
Example 2
Consider a controller that has one CNB and 20 produce tags, two consumers each,
and 10 consumed tags.
 There will be 70 connections used ((20 x (2+1)) + 10) in the controller. The CNB
will have 50 connections, ((20 x 2) +10).
Note: The CNB/D is only recommended to have 48 connections, so we may be
exceeding the CNB's bandwidth.
Example 3
Consider a controller that has one ENBT and 60 produce tags, two consumers each.
 The controller will reserve (60 x (1 + 2)) = 180 connections. However, if none of
the consumers are unicast, then the ENBT will complain it is out of buffer
memory. The limit of 32 produced non-unicast tags has been exceeded in the
ENBT.
 If 40 of the tags are consumed as unicast only, then there will be 40 unicast x 2 =
80 connections and 20 multicast x (1 + 2) = 60 connection for a total of
140 connections used in the processor, and 120 connections used in the
ENBT. The ENBT will be using 20 out of the available 32 multicast addresses.
Example 4
Consider a controller that has 2 produced tags produced through ENBT. Each
produced tag goes to two consumers. The controller also has 4 consumed tags.
 Assuming the consumers are not unicast, there will be a total of 10 connections in
the controller. There is a connection for each of the 4 consumer tags. Each
produced tag will use 3 connections (1 +2). Since there are two produced tags,
there are 6 connections. 6 + 4 = 10 total connections used in the controller. The
ENBT will show 8 connections and will have two multicast addresses used.