Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario descargar pdf (Pagina 82)

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

Chapter 5 Predict System Performance

Part Two: Predict Maximum input or Output Times for

CIP Connections

A CIP connection is an efficient communication path used for high

performance. The following are basic types of CIP connections:

• Rack-optimized

• Input or output data

• Produced tag

A CIP connection is bi-directional. During every RPI, each end of a connection

initiates a packet of information. A packet of information represents a

connection.

The type of data packet produced by each end of the connection depends on the

connection type as described below.

To predict the maximum input (I/O to controller) or output (controller to I/O)

times for CIP connections, complete the following steps.

1. Estimate the maximum time intervals for each CIP connection types

used in the control system.

2. If necessary, modify your system to get more throughput by performing

one or more of the adjustments described under step 5

on page 81.

3. If you have made modifications, verify that the modified system works by

recounting the connections and recalculating the packet rate capacity

Connection Type Scanner Adapter Producer

Controller

Consumer

Controller

Rack-optimized Output data Input data N/A N/A

Input data Heartbeat Input data N/A N/A

Output data Output data Output data echo N/A N/A

Produced tag N/A N/A Tag data Heartbeat

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 82