Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 97)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 97
Predict System Performance Chapter 5
Each of these controllers consumes one produced tag at an RPI = 20 ms.
Either of these EtherNet/IP modules uses these connections.
The total of 100 pps is well within the 1756-EN2T/A module’s, firmware
revision 2.003, remaining bandwidth of 9000 pps.
Recommendations to Achieve More Throughput in an Existing
Control System
Unlike the configuration of the last example control system, some control system
configurations do not initially have enough bandwidth to achieve the
desired throughput.
If you determine your control system does not have the bandwidth to achieve the
desired throughput, you need to modify your system. We recommend that you
use one of these tasks described in
step 5 on page 81 , to increase system
throughput.
EtherNet/IP Module ID: 2 or 3
Produced Tag Connections 0
= (1 + connections)/RPI
for each produced tag
= N/A
Consumed Tags 1 tag @ 20 ms
= 2/RPI for each consumed tag
= 2/20 ms = 100
Total Packets Per Second 100