Rockwell Automation Ethernet Design Considerations Reference Manual User Manual
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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013
Chapter 5
Predict System Performance
Fill in the worksheet for this module as follows.
The total of 1250 is well within the 1756-EN2T/A module’s, firmware revision
2.003, remaining bandwidth of 9000 pps. The total of 22 CIP connections is well
within the 1756-EN2T/ A module’s, firmware revision 2.003, capacity of 256
CIP connections.
PanelView Plus/FactoryTalk View Connection Considerations
PanelView Plus terminals and workstation with FactoryTalk View software use
RSLinx Enterprise software for communication with a Logix controller. RSLinx
Enterprise software can open 2…5 CIP connections to a single Logix-based
controller, based on the number of tags currently on scan.
RSLinx Enterprise software opens up to four CIP connections for tag reads,
based on the volume of tags requested. If a small number of tags are on scan at one
time, for example, 80 DINT tags, only one CIP connection is opened. If a larger
number of tags are currently on scan, for example, 320 DINT tags, four CIP
connections are opened for reads.
Only a single CIP connection is opened for all tag writes.
For more information on determining the number of CIP connections required
by a given application, see Rockwell Automation Knowledgebase article 39366.
You can access the Knowledgebase at
.
EtherNet/IP Module ID:
1
Rack-optimized Connections
5 @ 20 ms
(for digital I/O modules)
= (2 x connections)/RPI
= (2 x 5)/ 20 ms =
500
Direct Connections
15 @ 50 ms
(for analog I/O modules)
= (2 x connections)/RPI
= (2 x 15)/ 50 ms =
600
Produced Tag Connections
2 @ 20 ms
= (1 + connections)/RPI
for each produced tag
= (1 + 2)/ 20 ms =
150
Consumed Tags
0
= 2/RPI for each consumed tag
=
N/A
Total Packets Per Second
1250