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Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 89

Predict System Performance Chapter 5

Estimate Maximum Input or Output Times for CIP Connections

System response is dependent on several factors. These are the dominant factors:

• RPI value

• Number of implicit CIP connections.

To simplify, the response time of a connection can be approximated with only

the RPI.

The maximum input (I/O to controller) or output (controller to I/O) times for

implicit CIP connections can be estimated as follows:

• Rack-optimized: 1 RPI

• Direct Connect:

– Digital = 1 RPI

– Analog (nonisolated) = 2 RTS (Real Time Sampling rate)

– Analog (isolated) = 1 RTS

• Produced/Consumed Tag = 1 RPI

The above response times are estimates. For more accurate numbers, include

system delays, as described in Refine Estimates

on page 99.

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual do Utilizador Página 89