Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 90)

90 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013
Chapter 5 Predict System Performance
Example: Predict System
Performance This example ControlLogix system has the following components:
• 1756-L73 controller in chassis 1 that executes these tasks:
– Produces a tag that 1756-L73 controllers, in chassis 2 and 3 respectively,
consume at an RPI = 20 ms
– Controls remote I/O in chassis 4…8
• 1756-L73 controllers in chassis 2 and 3 consuming a tag from the
controller in chassis 1
• Eight 1756-EN2T/A communication modules, firmware revision 2.003,
one module in each chassis
• Fifteen digital I/O modules with rack-optimized connections at an
RPI = 20 ms, 3 modules in each chassis 4…8
• Fifteen analog I/O modules across five remote chassis with direct
connections at an RPI = 50 ms, three modules in each chassis 4…8
• PanelView Plus terminal with a direct connection to an array of 40 tags at
an RPI = 100 ms and an explicit connection to an array of 100 tags sent
every 300 ms
• Workstation running FactoryTalk View SE software, requiring explicit
messaging of an array of 1500 tags every 100 ms. This workstation also
connects to the company Intranet
IMPORTANT The information in the remainder of this section shows how to compute system
performance with ControlLogix controllers.